Axial flux induction electric motor rotor stator.
A stator of an outer rotor type motor is provided to form a stable installation structure while reducing raw materials of a electric motor rotor stator and an insulator and to reduce a noise and a vibration by increasing stiffness of a coupling part of the stator. A helical core(HC) includes a plurality of stacked layers which are formed by winding single steel plates having a predetermined shape in a spiral shape. The helical core includes a base part and a plurality of teeth protruded from the base part. A plurality of insulators are made of an electrical insulating material in order to cover the helical core. A recess is formed on the base part of the helical core in order to reduce stress due to the winding of the steel plates. The recess is disposed under the teeth. The steel plates are wound from a bottom layer of the steep plates to a top layer of the steel plates in the spiral shape.
This paper presents a methodology for controlling the transient as well as steady state torque production from each rotor of a electric motor rotor stator, dual-rotor induction motor drive fed by a single power inverter. This type of drive topology is targeted towards electric vehicle applications where the expected benefits are a more simple drive train design no mechanical differential required, traction control, and lower cost compared to a two inverter, two motor combination. This paper includes the theoretical formulation of a suitable "dual motor" machine model from which the required control relations are derived. Experimental results from a laboratory set up are presented as well to verify the potential of the arrangement.
An electric motor drive with a stator and a rotor in combination with an eccentric gear is disclosed. The eccentric gear comprises at least two eccentrically-offset discs ,arranged one over the other in an essentially annular chamber , which roll around an inner circumferential surface of the chamber with the external circumferential surface thereof as a result of the drive motion of the drive . The discs , have essentially circularly-arranged drillings , , into which the retaining bolts extend, the above being connected to a drive shaft. The discs,are themselves embodied as a rotor and set in driven motion, directly by the stator.
A stator for an electric motor having a rotation axis includes a plurality of electric coils . Each one of the plurality of electric coils include an inner winding layer , a plurality of mid-winding layers , and an outer winding layer . The inner winding layer is wound about and spaced from a centerline that generally intersects the rotation axis , and defines an opening for the flow of cooling air. The plurality of mid-winding layers are disposed radially outward from the inner winding layer with respect to the centerline . Each mid-winding layer of the plurality of mid winding layers is disposed radially inward from the next adjacent mid-winding layer with respect to the centerline. The outer winding layer is disposed radially outward from the plurality of mid-winding layers with respect to the centerline .
In manufacture of machine parts, an automated product inspection can save time and resources. Large scale electric motor stator and rotor sheets are manufactured by stamping. The sheet metal is usually stored outdoors and brought into the factory before processing. The difference in temperatures and other factors create the need to inspect the produced sheets to verify that they meet specifications. This is often done by hand, but this operation is time consuming and is prone to human error. The aim of this work is to explore the possibility of using a machine vision system to solve this task.
A brushless electric motorsystem having integrated power stages, said electric motor system comprising a rotor, a stator, a plurality of power stages, and a cooling system comprising a substantially flat hollow main cool body arranged to support the flowing of a cooling medium inside said hollow main cool body for cooling said main cool body, a base cooling plate connected to a first flat surface of said hollow main cool body and to said plurality of power stages for transferring heat between said plurality of power stages and said base cool plate, heat resistance inserts connected to said base cooling plate and said plurality of electrically excitable coils for transferring heat between said plurality of coils and said base cooling plate wherein said heat resistance inserts provide for a thermal conductivity, thereby creating a thermal buffer such that said electrically excitable coils are cooled less compared to said power stages, by said cooling system.
Axial flux induction motor is suitable as main motor in electric vehicle, because the dimension is smaller than common induction motor. Stator and rotor in axial flux induction motor have the shape as two discs that face each other. This final project presents the design of three phase axial flux induction motor with single stator and single rotor. Designing of axial flux induction motor is almost same as the general motor that uses radial flux, but it has different flux direction. The specification of prototype is single stator single rotor, three phase, four pole, with phase to phase voltage 100 Volt and output power target is 500 watt. Core was built with steel St.37. The induction motor has 66 mm length and 200 mm in diameter. With 15 Volt supply, motor speed is 1366 rpm. With torque vs speed characteristic curve, we can find the maximum torque, Maximum torque of this motor is 0,79 Nm.
Performances of ultrasonic motor (USM) depend considerably on contact state between stator and rotor. To measure the contact state in a traveling wave ultrasonic motor (TWUSM), a special test method is necessary. This paper develops a new method named electric contact method to measure contact state of stator and rotor in traveling wave type USM. The effects of pre-load and exciting voltage (amplitude) of stator on contact state between stator and rotor are studied with this method. By a simulating tester of friction properties of TWUSM, the variations of stalling torque and no-load speed against the pre-load and the exciting voltage have been measured. The relative contact length that describes the contact characteristic of stator and rotor is proposed. The relation between the properties of TWUSM and the contact state of stator and rotor are presented. Additionally, according to a theoretical contact model of stator and rotor in TWUSM, the contact lengths at given conditions are calculated and compared with the experimental results.
Disclosed is a rotor for an electric rotor motor, consisting of a rotor bell with a peripheral wall and at least one one-sided rotor base to enclose a stator, in particular as a part of a motor housing with a high IP rating, for example IP54 per DIN/IEC-EN 60034-5. The rotor bell features a heat sink with high heat conductivity that extends through the rotor base in such a way that the motor heat arising on the inside can be removed via the heat sink through the rotor base to the outside into the environment. Further, the invention relates to an electric rotor motor, in particular with an encapsulated motor housing with a high IP-protection system, for example IP54 per DIN/IEC-EN 60034-5, consisting of a stator and a rotor enclosing the stator in an embodiment of the above-described type.
One or more wheels of an electrically powered vehicle contains a motor comprising a rotor and a stator that is mounted on an integrated structure having a motor stator mounting portion and wheel axle portion. The structure is fabricated from a unitary non-ferromagnetic substance. A rotor housing is journalled to the axle portion on both sides of the motor stator mounting portion via bearings. A wheel assembly can be mounted on the rotor housing to be driven by the motor. Forced-air cooling is provided through a hollow central passage. A plug separates the passage cooling is provided through a hollow central passage. A plug separates the passage cooling is provided through a hollow central passage. A plug separates the passage into two distinct sections, an inlet and an outlet. A plurality of cavities, provided with heat exchanger surfaces, are contained within the stator mounting portion. Channels at each end of each cavity extend in the radial direction into the central passage.
In-wheel direct drive (IWDD) of electric vehicles (EVs), which simplifies the transmission system and facilitates flexible control of vehicle dynamics, has evolved considerably in the EV sector. This paper proposes a novel double-stator double-rotor motor (DSDRM) with a bidirectional flux modulation effect for in-wheel direct drive of EVs. With the proposed special design, a synthetic-slot structure with synthetic materials containing copper and permanent magnets (PMs) in the slots of the motor is ingeniously employed, and the outer and inner rotors are mechanically connected together as a single rotor, making its mechanical structure less complicated than those of two-rotor machines.Axial flux induction electric motor rotor stator. The main work of this paper involves the design, analysis, construction, and testing of the proposed machine. The DSDRM with a synthetic-slot structure was demonstrated to be feasible by finite element analysis (FEA), prototype fabrication, and experimental results. In addition, vehicle layout with DSDRM is presented and verified by the vehicle road test experiment.
An electric motor includes a stator having a core back which varies in width in a circumferential direction, and a rotor provided with permanent magnets. In the electric motor, cogging torque is generated M times during one revolution of the rotor, due to the number of magnetic poles of the rotor and the varied shape of the core back. The core back is provided with a step shift by an angle obtained by multiplying (360/M/2) degrees with an odd number. According to one embodiment, the core back may be provided with holes, concave portions or convex portions, so as to provide the core back with the step shift.
Brushless permanent magnet machines (BPMMs) have a greater efficiency and smaller overall dimensions than do other types of machines and are widely used in electric drives for various purposes. Two types of BPMMs are used in practice: BPMMs with a classical double-layer-distributed stator winding and BPMMs with a toothed-step stator winding. There exists another type of BPMM with a transverse magnetic flux (transverse flux motors, TFMs) which is being actively studied. In TFM electric motors, the magnetic lines of fluxes of the poles of rotor end perpendicular to the direction of rotor rotation. Stator windings in these machines are fabricated as rings coaxial with rotor, and the magnetic circuit of stator consists of separate fragments. Specialists assert electric TFMs have a higher specific power—the ratio between the output power and the mass of the machine—than the electric motors of other type. They are of interest, first and foremost, for electric drives without reducing gears.
The cage rotor of an induction motor can be diagnosed by the spectra of the stator current, the air-gap flux, and the leakageflux. However, it is not clear how the connection of stator winding, that is, series or parallel, affects on these spectra.In this letter, we discussthe measured results on spectra of stator current and leakage flux in the both case of parallel and series stator winding.
An electric motor generates a large torque despite its small size, causes small torque ripples, and is able to perform field-weakening control when the number of revolutions is large. The electric motor comprises a stator having m portions where large magnetic resistance and small magnetic resistance exist in the radial direction around the entire circumference, and a rotor having n portions where large magnetic resistance and small magnetic resistance exist in the radial direction around the entire circumference. The value │m-n│ is an integer less than 3, m and n are large numbers. The stator is provided with two-pole, multi-phase stator windings. The structure such that the salient poles of the stator and rotor are shifted slightly from each other enables the motor to generate large torque and cause only small torque ripples.
A textile loom has a weft thread pick-up which is moved by a lifting component with a direct-drive linear electric motor. The direct linear drive consists of a rotor and stator . The rotor movement is parallel to that of the lifting component . The rotor is coupled to the weft lifting component by a suitable linkage . The direct drive also forms part of the electrical drive for the loom paddle. The component parts are mounted on a common frame.
The brake is in the form of an electric motor and has a blocking brake function that is produced by pronounced stator and rotor poles and applying a defined blocking current to bring the poles into a latching position and hold them there or to hold them in a latching position. The current is significantly reduced after reaching the latching position. An Independent claim is also included for a method of operating an electric brake.
An electric motor has a stator bushing in which components that generate heat are disposed. A rotor housing that has at least one air conveying element is rotatably connected to the stator bushing. The air conveying element has a top side that is facing the stator bushing and that is at least basically smooth. The air conveying element has an annular disk that is provided with the basically smooth top side. The air conveying element has flow guiding elements that are radially extending ribs provided on the bottom side of the annular disk.
The commutatorless direct current motor has a substantially cylindrical, external permanent magnet rotor having north poles and south poles . The rotor surrounds a substantially cylindrical stator provided with main poles between with auxiliary poles are interspersed. An annular gap is defined between the rotor and the stator. Axial flux induction electric motor rotor stator.To reduce magnetic or reluctance caused fluctuation of the motor torque each main pole of the stator has an angular extent which substantially corresponds to that of a rotor pole . Furthermore, the stator periphery is provided with protuberances arranged such that permanently magnetically caused components of torque ripple are reduced. Contour corrections 16 are also provided.
A rotor for an electric motor includes a frame made of a resin and having a cylindrical yoke mounting portion, a base covering one end side of the yoke mounting portion, and a shaft supporting portion located at the center of rotation of the base, all of which are formed integrally with the frame, a rotor yoke mounted on the yoke mounting portion and substantially divided into a plurality of unit yokes, and a plurality of rotor magnets mounted on the yoke mounting portion along the rotor yoke.
An electric motor of outer-rotor type includes: an inner stator mounted on a stator holder, an outer rotor rotatably circumferentially disposed around the inner stator, a shaft coaxially secured with the outer rotor, and a housing combined with the stator holder for encasing the outer rotor and the inner stator within the housing; with the inner stator including an annular core made of magnetic conductor, a plurality of fin arrays made of magnetic conductors and formed as a fin array assembly concentrically wrapped on the annular core, and a plurality of insulating coil bobbins each coil bobbin pre-wound with the coil windings thereon and jacketed on each fin array, thereby forming an inner stator having a stable construction, a higher winding capacity, higher magnetic flux density and higher output power, as well as a lower production cost.
A brushless permanent magnet electric motor with a fixed radial air gap is operated to a much higher speed than normal maximum speed by the reduction in effective magnet pole strength. Increasing the amount of axial misalignment of the permanent magnet rotor and stator proportionally increases the speed and reduces the torque. The permanent magnet rotor is offset axially to provide axial misalignment between the rotor magnet poles and the stator, reducing the effective magnet pole strength or flux to the stator. An integral constant velocity linear bearing is used to couple the movable rotor and the fixed position motor shaft. A thrust bearing is actuated to offset the magnetic rotor against the attractive magnetic forces toward the stator. The use of a constant velocity linear bearing allows the motor shaft, radial support bearings, position encoder, cooling fan, and output coupling to remain in a constant position while rotor position is offset.
A motor has a rotor and a stator. The stator is made up of a plurality of separate electromagnet core segments disposed coaxially about an axis of rotation. The core segments are affixed, without ferromagnetic contact with each other, to a non-ferromagnetic support structure. The rotor is configured in an annular ring that at least partially surrounds the annular stator to define two parallel axial air gaps between the rotor and stator respectively on opposite axial sides of the stator. Permanent magnets are distributed on each side of the rotor annular ring that faces an air gap. Preferably, each stator electromagnet core segment has a pair of poles aligned in a direction generally parallel to the axis of rotation with pole faces generally perpendicular to the axis of rotation. A winding is formed on a core portion that links the poles to produce, when energized, magnetic poles of opposite polarity at the pole faces.
In a rotary electric motor, a stator contains a plurality of separate electromagnet core segments disposed coaxially about an axis of rotation. The core segments are affixed, without ferromagnetic contact with each other, to a non-ferromagnetic support structure. The rotor is configured in a U-shaped annular ring that at least partially surrounds the annular stator to define two parallel axial air gaps between the rotor and stator respectively on opposite axial sides of the stator and at least one radial air gap. Axial flux induction electric motor rotor stator.Permanent magnets are distributed on each inner surface of the U-shaped rotor annular ring that faces an air gap. A winding is formed on a core portion that links axially aligned stator poles to produce, when energized, magnetic poles of opposite polarity at the pole faces.
The concentric rotors fixed to a common shaft rotate respectively within and around a stator which is bolted to a bearing plate and has an annular winding laid in grooves around its outer and inner edges. The rotors carrying cage windings in corresp. grooves have equal numbers of poles,a nd their torques are added together. On the edges of the stator , poles of opposite polarity are arranged in alternate sequence. USE/ADVANTAGE - Max. power is obtainable at min. cost of material.
A brushless permanent magnet electric motor with a fixed radial air gap is operated to a much higher speed than normal maximum speed by the reduction in effective magnet pole strength. Increasing the amount of axial misalignment of the permanent magnet rotor and stator proportionally increases the speed and reduces the torque. The permanent magnet rotor is offset axially to provide axial misalignment between the rotor magnet poles and the stator, reducing the effective magnet pole strength or flux to the stator. An integral constant velocity linear bearing is used to couple the movable rotor and the fixed position motor shaft. A thrust bearing is actuated to offset the magnetic rotor against the attractive magnetic forces toward the stator. The use of a constant velocity linear bearing allows the motor shaft, radial support bearings, position encoder, cooling fan, and output coupling to remain in a constant position while rotor position is offset.
An electric motor with a wound stator and a permanent magnet rotor, wherein optical commutation is combined with a ferrite stator core to provide improved high speed capability and efficiency, long life, and utility in any atmosphere. A novel pole format of six poles or multiple thereof combined with electronic pulsing gives the motor a stepping capability enabling it to follow incremental tape storage, computer, or master-slave commands, as well as providing further torque and speed potential. Optional use of a ferrite rotor provides extreme longevity to the motor.
The stator is made up of a plurality of separate electromagnet core segments disposed coaxially about an axis of rotation. The core segments are affixed, without ferromagnetic contact with each other, to a non-ferromagnetic support structure. The rotor is configured in an annular ring that at least partially surrounds the annular stator to define two parallel axial air gaps between the rotor and stator respectively on opposite axial sides of the stator.
A two-pole electric motor constructions are described which have stator winding encircling the rotor, and the method is described of assembling same. A main stator section is provided with coil bearing surfaces which receive rotor coils after the rotor has been inserted into the rotor receiving opening, the coils being moved into overlapping relationship with the rotor and limited in movement or aligned by a stop or limit projection between the coil bearing surfaces. The main stator sections are secured either by the use of U-shaped upper and lower yokes, or rectangular yoke sections to fix the positions of the stator coils, and the rotors are mounted for rotation but against axial movement by the means of suitable brackets or stand-off or spacing members.
A rotary electric motor is provided which comprises an annular first rotor, an annular stator disposed concentric with and radially outside the first rotor, and an annular second rotor disposed concentric with and radially outside the stator, the stator including a stator core made up of a plurality of stator pieces that are arranged in a circular array and electrically independently from each other, coils wound around the respective stator pieces, annular first and second brackets disposed on opposite axial ends of the stator core, a fastening device passing through holes of the first and second brackets and fixedly holding the stator core between the first and second brackets, and an induction current suppressing device suppressing an induction current that is produced in response to a variation of magnetic flux of each of the coils and flows through the fastening device.
An electric motor includes a stator and a rotor and a bearing that connects both in a rotatable manner. The rotor and stator include electric conductor paths leading to exciting coils and/or to electronic components, all arranged on an iron-plate serving as a magnetic return path. The iron-plate has at least one electrical insulating layer that serves to insulate it, as well as at least the conductive layer forming the conductor paths which are on the insulating layer.
The external rotor electric motor has a dished stator supporting a wound stator laminations packet and a dished rotor with a permanent magnetic rotor on the inside of its outer edge, fitted to a rotor shaft , supported by a bearing flange of the stator and a bearing plate on the inside of the stator. The rotor position is monitored by an internal measuring system , the bearing plate providing a large peripheral hollow space between the measuring system and the stator.
Dual clutch transmission for drive train of motor vehicle, has electric machine with rotor and stator, particularly electric motor and momentum start clutch.The dual clutch transmission has an output shaft, two drive shafts and a dual clutch with two friction clutches. The dual clutch transmission has an electric machine with a rotor and a stator , particularly an electric motor and a momentum start clutch , and is thus formed as a hybrid-dual clutch transmission.
Device for forming a leno selvedge with an electric motor comprising a rotor and a stator casing accommodating the rotor, whereas the rotor is provided with at least two guiding apertures for the doup ends and whereas the rotor is provided with several magnetic poles oriented in axial direction, the rotor being provided with two spaced magnetic rings arranged in radial direction, the magnetic rings being provided with several magnet segments each, the magnet segments of the one magnetic ring being locally offset relative to those of the other magnetic ring, whereas the rotor is received on both sides in axial direction by the stator casing , whereas the stator casing is provided with iron cores with appropriate windings , the ends of which being oriented toward the magnetic poles of the rotor.
Electric motor rotary drive e.g. for computer tomography, has sector-shaped stator with ends facing rotor with increasing distance from rotor starting from curved inside of stator parallel to outside of rotor .The device has at least one stator extending over a sector of its circumference and a rotor with a permanent magnet. End zones on the peripheral ends of the stator have ends facing the rotor with an increasing distance from the rotor starting from the curved inside of the stator parallel to the outside of the rotor.
