synchronous motor

Asynchronous motors and synchronous motors are two common types of rotating motors, which differ in their operating principles and performance characteristics. 1. Operating Principle: Asynchronous motors rotate based on the relative motion between the rotating magnetic field generated in the windings and the magnetic field; synchronous motors, on the other hand, need to synchronise the magnetic field generated in the windings with the external magnetic field. 2. Starting method: asynchronous motors usually use starting capacitors, starting resistors, motor exciters and other auxiliary equipment to start; while synchronous motors generally need to be externally provided with starting torque. 3. speed control: asynchronous motor speed is generally controlled by the voltage change, can be achieved by frequency conversion and other ways; synchronous motor speed is limited by the frequency of the power supply, usually need to use a mechanical speed changer to achieve speed control. 4. power factor: asynchronous motor in the load change, its power factor is usually variable, in the light load or no load situation power factor is low; synchronous motor in part of the load power factor is high, and can be adjusted through the reactive power compensation power factor. 5. Overload characteristics: asynchronous motors have better overload capacity, can withstand a large load impact in a short period of time; synchronous motors have poorer overload capacity, and are prone to stall for overload conditions.Because synchronous motors need to be synchronised with an external power source, they usually require a more complex control system for implementation; whereas asynchronous motors have a relatively simple control system because they do not need to be synchronised with an external source.

Working principle of synchronous motor Synchronous motor is a special type of reversible motor, which is characterised by the fact that the speed of the active rotor can be precisely controlled. Synchronous motor is generated by the stator magnetic field, by the generator active rotor passive turn, stator AC winding and active rotor lead lap symmetrical winding and rotor mounted on the rotor rotor magnet group to form two mutually parallel strong magnetic field of the motor. When the phase difference meets the directional requirements, the synchronous motor can accurately control the rotor spin, so that the output power can be adjusted according to the need to solve the problem of output changes, to achieve speed control and constant speed control. The stator coil of the synchronous motor generally adopts multi-pole winding, so that the alternating undulation of the magnetic field has multi-pole changes, which improves the utilisation efficiency of the motor. Characteristics 1, torque precision: AC synchronous motor has high precision, stator centre coil can choose some higher precision coils according to the need, the precision can be as high as 1/1000, it can realize the precise control without load, and it has strong ability of low speed and heavy load. 2、Simple mechanical structure: the synchronous motor's mandrel consists of support and sealing and stator winding and other components, simple structure, small size, easy to load and install, as well as maintenance and change. 3、Stator coil has damping effect: the stator coil can be integrated with some multi-pole windings, which can effectively stabilise the torque. 4, low material cost: due to the small load factor of synchronous motor, stator and rotor magnet density is low, low material cost, can effectively save costs. Summary Synchronous motor is a special kind of reversible motor. It is characterised by a finely defined torque, simple mechanical construction, damping effect in the stator coil and low material cost. It has strong braking performance and high precision, and can be used for speed control, fast response, positioning control and speed measurement. It can be used in variable speed regulation structures due to its auto zero function. It can also be used in high-speed precision positioning control systems, but it needs to be realised with high-performance electronic drives and servo control systems. In addition, the synchronous motor has a good performance in energy saving, especially suitable for use in low voltage variable speed motor control. The future of synchronous gear motors is very promising, but at present they are not yet capable of meeting the requirements of a number of applications, and a number of improvements and optimisations may be required to extend their range of services.