Drive motor classification

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Drive motor classification

Drive motor classification

Drive motor classification

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Drive motor classification

2020-04-27 |

At present, the commonly used motors are brushless DC motors, permanent magnet synchronous motors, squirrel-cage asynchronous motors, and switched reluctance motors.



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Based on various comparisons, AC induction motors and permanent magnet synchronous motors are widely used in electric vehicles. The following focuses on permanent magnet synchronous motors.



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permanent magnet synchronous motor structure



A synchronous motor that generates a synchronous rotating magnetic field by permanent magnet excitation is called a permanent magnet synchronous motor. The permanent magnet is used as a rotor part to generate a rotating magnetic field, and the three-phase stator winding is induced by the rotating magnetic field to generate a three-phase symmetrical current through the armature reaction. The mechanical energy (kinetic energy) of the rotor is converted into electrical energy, and the permanent magnet synchronous motor is used as a generator (G); because the three-phase stator differs in space position by 120, when a three-phase symmetrical current is input on the stator side, the three-phase stator Electric current will produce a rotating magnetic field in the space. The rotor is subjected to electromagnetic force in the rotating magnetic field to produce motion. At this time, the electrical energy is converted into kinetic energy, and the permanent magnet synchronous motor can be used as a motor (M).



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Generally, the stator, rotor, end cover and various sensors are assembled separately to form a permanent magnet synchronous motor. The stator structure of the permanent magnet synchronous motor is very similar to the structure of a general induction motor, but the rotor part of the permanent magnet synchronous motor is very different from other motors-there are permanent magnet poles of better quality on the rotor. According to the different placement of permanent magnets on the rotor, permanent magnet synchronous motors are generally divided into three categories: surface-mounted, in-line and plug-in.



Stator: The stator is mainly composed of an iron core and a coil; the stator iron core is formed by laminating sheets; the enameled wire is wound into a coil, embedded in the iron core slot, and then subjected to insulation treatment; the insulated core is inserted into the casing to obtain the stator. Rotor: The rotor is made of iron core, magnetic steel and shaft.



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Drive motor classification