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3kw single phase motor motor suppliers south africa

3kw single phase motor motor suppliers south africa

3kw single phase motor motor suppliers south africa

Equipment, computer external equipment and industrial automation equipment. Such as disk drive, copier, CNC machine tool, robot and so on.

A motor that uses electric energy to directly produce linear motion. Its working principle is similar to the corresponding rotary motor, and its structure can be seen as the evolution of the corresponding rotary motor by cutting and straightening along the radial direction. Linear motor consists of stator and mover. Under the action of electromagnetic force, the mover drives the external load to move and do work. When linear motion is needed, the overall structure of the device can be simplified by using linear motor, which is mostly used in various positioning systems and automatic control systems. The high-power linear motor can be used in the traction of electric railway high-speed train and the launching of torpedo.

According to the principle, linear motor is divided into DC linear motor, AC linear asynchronous motor, linear stepping motor and AC linear synchronous motor.

Single phase AC motor has only one winding, and the rotor is squirrel cage type. When the single-phase sinusoidal current passes through the stator winding, the motor will produce an alternating magnetic field. The strength and direction of the magnetic field change sinusoidally with time, but it is fixed in spatial orientation, so it is also called alternating pulsating magnetic field. This alternating pulsating magnetic field can be decomposed into two rotating magnetic fields that are opposite to each other at the same speed and direction of rotation. When the rotor is stationary, the two rotating magnetic fields produce two torques of equal size and opposite direction in the rotor, making the synthetic torque zero, so the motor cannot rotate. When we use external force to make the motor rotate in a certain direction (such as clockwise rotation), the cutting magnetic force line movement 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 in 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 difference of 90 degrees in time are connected to two windings with a difference of 90 degrees in space, which will generate a (two-phase) rotating magnetic field in space, as shown in Figure 2. Under the action of this rotating magnetic field, the rotor can start automatically. After starting, when the speed rises to a certain value, the starting winding is disconnected with the help of a centrifugal switch or other automatic control device installed on the rotor. Only the main winding works in normal operation. Therefore, the starting winding can be made into a short-time working mode. However, there are many times when the starting winding is continuously opened. We call this kind of motor capacitive single-phase motor. To change the direction of this motor, we can change the position of capacitor series connection.

3kw single phase motor motor suppliers south africa

Motors with small volume and capacity and output power below hundreds of watts and motors with special requirements for purpose, performance and environmental conditions. Full name: Micro special motor, referred to as micro motor. It is often used in the control system to realize the detection, calculation, amplification, execution or conversion of electromechanical signals or energy, or to drive mechanical loads. It can also be used as the AC and DC power supply of equipment.

There are many kinds of micro and special motors, which can be roughly divided into 13 categories: DC motor, AC motor, self state angle motor, stepping motor, resolver, shaft angle encoder, AC and DC dual-purpose motor, tachogenerator, inductosyn, linear motor, piezoelectric motor, motor unit and other special motors.

Micro and special motors can be divided into three types in structure: ① electromagnetic type. The basic composition is similar to that of ordinary motor, including stator, rotor, armature winding, brush and other components, but the structure is particularly compact. ② Combined. There are two common types: the combination of the above micro motors; Combination of micromotor and electronic circuit. For example, the combination of DC motor and sensor, the combination of x-direction and Y-direction linear motor, etc. ③ Non electromagnetic. The external structure is the same as the electromagnetic type. For example, the rotating products are made into a cylinder and the linear products are made into a square, but the internal structure is very different due to its different working principle.

The performance of various micro and special motors varies greatly, and its performance parameters are difficult to be clarified uniformly. Generally speaking, for driving machinery, it focuses on the force and energy index during operation and start-up; For power supply, the output power, waveform and stability shall be considered; The micromotor for control focuses on static and dynamic characteristic parameters. The characteristics of the two types of motors are similar to those of ordinary motors. Only the micro motor for control has its unique characteristic parameters. ① Operating characteristics. It is often expressed by the relationship between output and input, or between one output and another output. In terms of control requirements, the static characteristic curve shall be continuous and smooth without sudden change; Dynamic characteristics are often represented by frequency curve or response curve. The frequency curve shall be stable without sudden jump and oscillation point; The response curve shall converge rapidly. ② Sensitivity. The size of the output amount corresponding to the unit input signal. It is generally expressed by specific torque, specific electromotive force, amplification factor, etc. ③ Accuracy. Under certain input conditions, the difference between the actual value and the theoretical value of the output signal represents the accuracy of the micromotor, which is often expressed by the size of the error. ④ Impedance or resistance. In the system, the input and output impedance of the micromotor shall be matched with the corresponding circuit respectively to ensure the operation performance and accuracy of the system. ⑤ Reliability. It is not only the special requirement of micro motor for control, but also that of driving micro motor and power micro motor. Service life, failure rate, reliability and mean time between failures are commonly used to characterize the operation reliability of micromotors.

Micro and special motors are mainly used in three fields: ① the driving field without special control requirements cooperates as the power source of moving mechanical load. ② Audio visual equipment. For example, in a video cassette recorder, the micro motor is not only the key component of the drum assembly, but also an important component of its main shaft drive, automatic loading of tape and cassette, and tape tension control. ③ Office automation

3kw single phase motor motor suppliers south africa

In single-phase motor, another method of generating 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 on the 1 / 3-1 / 4 full pole surface. As shown in Figure 3, the magnetic pole is divided 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 sleeved on the whole magnetic pole, and the coils of each pole are connected in series. When connecting, the polarity generated must be arranged according to 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 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 the capacitive motor, so as to generate a rotating magnetic field to make the motor rotate.

Three phase asynchronous motor is a kind of motor powered by 380V three-phase AC power supply (phase difference of 120 degrees). Because the rotating magnetic field of rotor and stator of three-phase asynchronous motor rotates in the same direction and at different speeds, there is slip rate, so it is called three-phase asynchronous motor.

Basic working process:

(1) When the three-phase asynchronous motor is connected to the three-phase AC power supply (each with a difference of 120 degrees), the three-phase stator winding flows through the three-phase magnetomotive force (stator rotating magnetomotive force) generated by the three-phase symmetrical current and generates a rotating magnetic field, which rotates clockwise along the inner circular space of the stator and rotor at the synchronous speed N0.

(2) The rotating magnetic field has relative cutting movement with the rotor conductor. According to the principle of electromagnetic induction, the rotor conductor (the rotor winding is a closed path) generates induced electromotive force and induced current (the direction of induced electromotive force is determined by the right-hand rule).

(3) According to the law of electromagnetic force, under the action of induced electromotive force, the induced current basically consistent with the direction of induced electromotive force will be generated in the rotor conductor. The current carrying rotor conductor is affected by the electromagnetic force in the magnetic field generated by the stator (the direction of the force is determined by the left-hand rule). The electromagnetic force forms an electromagnetic torque on the motor rotor shaft, drives the motor rotor to rotate along the direction of the rotating magnetic field, and outputs mechanical energy outward when there is a mechanical load on the motor shaft. Since the magnetic flux of the part without short-circuit ring is ahead of that of the part with short-circuit ring, the rotation direction of the motor is the same as that of the rotating magnetic field.

3kw single phase motor motor suppliers south africa

There are many forms of motor, but its working principle is based on the law of electromagnetic induction and the law of electromagnetic force. Therefore, the general principle of its structure is to use appropriate magnetic and conductive materials to form magnetic circuits and circuits for mutual electromagnetic induction, so as to generate electromagnetic power and achieve the purpose of energy conversion.

Three phase asynchronous motor is an induction motor. After the current is applied to the stator, part of the magnetic flux passes through the short-circuit ring and generates induced current. The current in the short-circuit ring hinders the change of magnetic flux, resulting in the phase difference between the magnetic flux generated by the part with short-circuit ring and the part without short-circuit ring, so as to form a rotating magnetic field. After power on and start-up, the rotor winding induces electromotive force and current due to the relative movement between the rotating magnetic field and the magnetic field, that is, the rotating magnetic field has relative speed with the rotor, and interacts with the magnetic field to produce electromagnetic torque, which makes the rotor rotate and realize energy conversion.

1. Classification by working power supply

According to the different working power supply of the motor, it can be divided into DC motor and AC motor. AC motor is also divided into single-phase motor and three-phase motor.

2. Classification by structure and working principle

According to the different structure and working principle of motor, it can be divided into DC motor, asynchronous motor and synchronous motor.Synchronous motors can also be divided into permanent magnet synchronous motors, reluctance synchronous motors and hysteresis synchronous motors.Asynchronous motor can be divided into induction motor and AC commutator motor. Induction motor is divided into three-phase asynchronous motor, single-phase asynchronous motor and shaded pole asynchronous motor. AC commutator motor is divided into single-phase series excitation motor, AC / DC dual-purpose motor and repulsion motor.

According to the structure and working principle, DC motor can be divided into brushless DC motor and brushless DC motor. Brushless DC motor can be divided into permanent magnet DC motor and electromagnetic DC motor. Electromagnetic DC motor is divided into series excitation DC motor, parallel excitation DC motor, separate excitation DC motor and compound excitation DC motor. Permanent magnet DC motor is divided into rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and aluminum nickel cobalt permanent magnet DC motor.

3kw single phase motor motor suppliers south africa

3. Classification according to startup and operation mode

According to the different starting and operation modes of the motor, it can be divided into capacitance starting single-phase asynchronous motor, capacitance running single-phase asynchronous motor, capacitance starting running single-phase asynchronous motor and split phase single-phase asynchronous motor.

4. Classification by purpose

It can be divided into drive motor and control motor.

Motors for driving are divided into motors for electric tools (including drilling, polishing, polishing, slotting, cutting, reaming and other tools) Motors for household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders, DVD players, vacuum cleaners, cameras, hair dryers, electric shavers, etc.) and motors for other general small mechanical equipment (including various small machine tools, small machinery, medical appliances, electronic instruments, etc.).

Control motors are divided into stepping motors and servo motors.

5. Classification according to rotor structure

According to the different structure of the rotor, the motor can be divided into cage induction motor (called squirrel cage induction motor in the old standard) and wound rotor induction motor (called wound induction motor in the old standard).

6. Classification by operating speed

According to the running speed of the motor, it can be divided into high-speed motor, low-speed motor, constant speed motor and speed regulating motor.

Low speed motors are divided into gear reduction motors, electromagnetic reduction motors, torque motors and claw pole synchronous motors.

In addition to the stepwise constant speed motor, stepless constant speed motor, stepwise variable speed motor and stepless variable speed motor, the speed regulating motor can also be divided into electromagnetic speed regulating motor, DC speed regulating motor, PWM Variable frequency speed regulating motor and switched reluctance speed regulating motor.

The rotor speed of asynchronous motor is always slightly lower than the synchronous speed of rotating magnetic field.

The rotor speed of synchronous motor has nothing to do with the load, but always remains the synchronous speed.

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