Electric scooter hub motor price in india
AC motor
An AC motor is mainly composed of an electromagnet winding or distributed stator winding used to generate a magnetic field and a rotating armature or rotor. The motor is made of the phenomenon that the energized coil rotates under force in the magnetic field. The
AC motor is composed of stator and rotor, and the stator and rotor use the same power supply, so the direction change of current in the stator and rotor is always synchronous, that is, the direction of current in the coil changes, and the direction of current in the electromagnet also changes. According to the left-hand rule, the direction of magnetic force on the coil does not change, and the coil can continue to rotate. AC motor works by this principle.
Principle of AC motor: the energized coil rotates in the magnetic field. The DC motor uses the commutator to automatically change the current direction in the coil, so as to make the coil rotate continuously in the same force direction. Therefore, as long as the force direction of the coil is consistent, the motor will rotate continuously. AC motor is the application of this point. AC motor is composed of stator and rotor. In the model you mentioned, the stator is an electromagnet and the rotor is a coil. The stator and rotor use the same power supply, so the direction of current in the stator and rotor always changes synchronously, that is, the direction of current in the coil changes, and the direction of current in the electromagnet also changes. According to the left-hand rule, the direction of magnetic force on the coil does not change, and the coil can continue to rotate. About the function of the two copper rings: the two copper rings are equipped with two corresponding brushes, and the current is continuously sent to the coil as a source of energy. The advantage of this design is that it avoids the winding problem of the two power lines, because the coil rotates continuously. If two wires are used to supply power to the coil, the two power lines will wind. The current in the coil is AC, and there is a time when the current is equal to zero. However, this time is too short compared with the time when there is current. Moreover, the coil has mass and inertia, and the inertia coil will not stop. AC motor generates a rotating magnetic field in the stator winding according to the characteristics of AC, and then causes the rotor coil to cut the magnetic induction line, so that the rotor coil generates an induced current. The induced magnetic field generated by the induced current is opposite to the magnetic field of the stator, so that the rotor has a rotating torque.
Electric scooter hub motor price in india
Single phase motor
Single phase motor generally refers to the low-power single-phase asynchronous motor powered by single-phase AC power supply (AC220V). Single phase asynchronous motors usually have two-phase windings on the stator, and the rotor is an ordinary squirrel cage type. The distribution of two-phase windings on the stator and the different power supply conditions can produce different starting and operating characteristics.
Working principle: when the single-phase sinusoidal current passes through the stator winding, the motor will generate an alternating magnetic field. The strength and direction of the magnetic field will change sinusoidally with time, but it is fixed in the spatial direction, so it is also called as alternating pulsating magnetic field. This alternating pulsating magnetic field can be decomposed into two rotating magnetic fields which are opposite to each other at the same speed and direction of rotation. When the rotor is stationary, the two rotating magnetic fields generate two torques of equal size and opposite direction in the rotor, making the synthetic torque zero, so the motor cannot rotate. When we use an external force to make the motor rotate in a certain direction (such as clockwise rotation), the motion of the cutting magnetic line of force between the rotor and the rotating magnetic field in the clockwise rotation direction becomes smaller; The cutting magnetic line of force motion between the rotor and the rotating magnetic field in the counterclockwise rotation direction becomes larger. In this way, the balance is broken, the total electromagnetic torque generated by the rotor will no longer be zero, and the rotor will rotate along the driving direction.
To make the single-phase motor rotate automatically, we can add a starting winding in the stator. The space difference between the starting winding and the main winding is 90 degrees. The starting winding should be connected with a suitable capacitor in series, so that the phase difference between the current and the main winding is approximately 90 degrees, that is, the so-called phase separation principle. In this way, two currents with a time difference of 90 degrees are connected to two windings with a space difference of 90 degrees, which will generate a (two-phase) rotating magnetic field in space. Under the action of this rotating magnetic field, the rotor can start automatically. After starting, when the speed rises to a certain level, the starting winding is disconnected with the help of a centrifugal switch or other automatic control devices installed on the rotor, and only the main winding works during normal operation. Therefore, the starting winding can be made into a short-time working mode. However, in many cases, the starting winding does not open continuously. We call this motor a single-phase motor. To change the direction of this motor, just change the terminals of the auxiliary winding.
In single-phase motor, another method to generate rotating magnetic field is called shaded pole method, also known as single-phase shaded pole motor. The stator of this kind of motor is made of salient pole type, which has two poles and four poles. Each magnetic pole is provided with a small slot at the 1/3--1/4 full pole surface, which divides the magnetic pole into two parts, and a short-circuit copper ring is sleeved on the small part, as if this part of the magnetic pole is covered, so it is called covered pole motor. The single-phase winding is sheathed on the whole magnetic pole, and the coils of each pole are connected in series. When connecting, the polarity generated must be arranged in N, s, N and s in turn. When the stator winding is energized, the main magnetic flux is generated in the magnetic pole. According to Lenz's law, the main magnetic flux passing through the short-circuit copper ring generates an induced current in the copper ring that lags behind 90 degrees in phase. The magnetic flux generated by this current also lags behind the main magnetic flux in phase. Its function is equivalent to that of the starting winding of a capacitive motor, thus generating a rotating magnetic field to make the motor rotate.
Electric scooter hub motor price in india
Three phase motor
Three phase motor means that when the three-phase stator windings of the motor (each with an electrical angle of 120 degrees difference) are connected with three-phase AC, a rotating magnetic field will be generated. The rotating magnetic field will cut the rotor winding and generate induced current in the rotor winding (the rotor winding is a closed path). The current carrying rotor conductor will generate electromagnetic force under the action of the stator rotating magnetic field, so as to form electromagnetic torque on the motor shaft and drive the motor to rotate, And the rotation direction of the motor is the same as that of the rotating magnetic field.
Performance: ys series three-phase motors are designed and manufactured according to national standards. They are characterized by high efficiency, energy saving, low noise, small vibration, long service life, convenient maintenance, large starting torque, etc. they are class B insulation, IP44 shell protection, ic411 cooling mode, 380V rated voltage and 50Hz rated frequency. They are widely used in food machinery, fans and various mechanical equipment. The executive standard is jb/t1009-2007 totally enclosed motor system with external fan cooling and squirrel cage structure. The utility model has the characteristics of novel design, beautiful appearance, low noise, high efficiency, high torque, good starting performance, compact structure, convenient use and maintenance, etc. The whole machine adopts class F insulation and is designed according to the insulation structure evaluation method of international practice, which greatly improves the safety and reliability of the whole machine. It has reached the advanced level of similar foreign products in the early 1990s. Y2 series motors can be widely used in machine tools, fans, water pumps, compressors, transportation, agriculture, food processing and other mechanical transmission equipment
asynchronous motor
Working principle: there are three-phase symmetrical AC windings on the stator of the asynchronous motor. When the three-phase symmetrical AC winding is connected with the three-phase symmetrical AC current, a rotating magnetic field will be generated in the air gap space of the motor. The conductor of the rotor winding is in the rotating magnetic field. The rotor conductor cuts the magnetic line of force and generates the induced potential to judge the direction of the induced potential. The rotor conductor forms a closed circuit by itself through the end ring and passes the induced current. The electromagnetic force is generated by the interaction between the induced current and the rotating magnetic field, and the direction of the electromagnetic force is judged. The electromagnetic force acting on the rotor will generate electromagnetic torque and drive the rotor to rotate. According to the above electromagnetic induction principle, asynchronous motor is also called induction motor. Asynchronous motors are also easy to derive various series of products according to the requirements of different environmental conditions. It also has a load characteristic close to constant speed, which can meet the requirements of most industrial and agricultural production machinery. Its limitation is that its speed and the synchronous speed of its rotating magnetic field have a fixed slip rate, so the speed regulation performance is poor. In the application occasions requiring a wide range of smooth speed regulation, it is not as economical and convenient as the DC motor. Special attention should be paid to standardization, serialization and generalization in the design and production of asynchronous motors.
Electric scooter hub motor price in india
Braking mode: there are three electrical braking modes for three-phase induction motor: energy consumption braking, reverse braking and regenerative braking.
(1) During energy consumption braking, cut off the three-phase AC power supply of the motor and send the DC power to the stator winding. At the moment of cutting off the AC power supply, due to the inertia, the motor still rotates in the original direction, and the induced electromotive force and induced current are generated in the rotor conductor. The induced current generates torque, which is opposite to the torque generated by the fixed magnetic field formed after the direct current is fed. Therefore, the motor stops rotating quickly to achieve the purpose of braking. This mode is characterized by stable braking, but DC power supply and high-power motor are required, the cost of DC equipment is large, and the braking force is small at low speed.
(2) Reverse braking is divided into load reverse braking and power reverse braking.
1) Load reverse braking is also called load reverse braking. When the rotor of the motor rotates in the direction opposite to the rotating magnetic field under the action of the heavy object (when the crane uses the motor to lower the heavy object), the electromagnetic torque generated at this time is the braking torque. This torque causes the weight to drop slowly at a steady rate. The characteristics of this kind of braking are: the power supply does not need reverse connection, no special braking equipment is required, and the braking speed can be adjusted, but it is only applicable to wound motor. Its rotor circuit needs to be connected in series with large resistance to make the slip greater than 1.
2) Power reverse connection braking when the motor needs braking, as long as the two-phase power lines are adjusted arbitrarily to make the rotating magnetic field opposite, it can brake quickly. When the motor speed is equal to zero, cut off the power supply immediately. This kind of braking is characterized by fast parking, strong braking force and no need for braking equipment. However, due to the large current and impact force during braking, it is easy to overheat the motor or damage the parts of the transmission part.
(3) Regenerative braking is also called feedback braking. Under the action of heavy objects (when the crane motor lowers the heavy objects), the speed of the motor is higher than the synchronous speed of the rotating magnetic field. At this time, the rotor conductor generates induced current and generates anti rotation torque under the action of rotating magnetic field. The motor enters the power generation state and feeds back to the power grid. This mode can naturally enter the feedback braking state and work reliably. However, the motor speed is high, so it needs a speed change device to slow down.
Electric scooter hub motor price in india
synchronous motor
Structure: the structure of synchronous motor is basically the same as that of synchronous generator, and the rotor is also divided into salient pole and hidden pole. However, most synchronous motors are salient pole type. The installation form is also divided into horizontal and vertical. In order to solve the starting problem of synchronous motor, the rotor is usually equipped with starting winding. It can also suppress oscillation during operation, so it is also called damping winding. In addition to the above traditional structure, there is also a claw pole rotor structure without sliding contact. Taking the 6-pole motor as an example, two groups of claw shaped magnetic poles are installed on the rotating shaft opposite to each other. One group extends three pole bodies on the claw plate to the right along the axial direction; The other group is installed on the right side in reverse, so that 3 pole bodies extend from the claw plate to the left along the axial direction. The polarity of the two groups of magnetic poles is opposite. After the outer circumference surface of the magnetic pole is assembled, it is no longer a round tile surface like the general salient pole motor, but a wedge tile surface, that is, the pole arc at one end is longer than the other end. The shape of the whole rotor is as shown in the figure. The excitation winding is assembled at the outer edges of the yokes on both sides. The magnetic flux generated by it passes through the lateral main air gap GM between N and S poles, and the axial air gaps G1 and G2 between rotor and stator, and then closes through the end cover and base, as shown by the dotted line in the figure. To prevent short circuit of magnetic flux through the rotating shaft, the rotating shaft shall be made of non-magnetic steel; Or divide the rotating shaft into 3 sections, and the middle section is made of non-magnetic steel. The main advantage of this structure is that the rotating part has no winding, and there is no sliding contact between the collector ring and the brush, so it has reliable operation, simple insulation structure and convenient maintenance. However, its main magnetic circuit is long and there are many air gaps, which increases the power required for excitation; The motor shell has strong magnetism, which will cause bearing heating; Magnetic isolation measures must also be taken for the rotating shaft. Therefore, this kind of motor has not been widely promoted. It is only used in some special occasions, and the general capacity is not more than several hundred kilowatts.
