A self-starting vernier permanent magnet motor with variable poles

Abstract

The invention discloses a pole variable self-starting vernier permanent magnet motor comprising a stator iron core, wherein open slots, as stator slots, are arranged on the inner ring surface of the stator iron core along the circumference; a rotor iron core, wherein closed slots, as rotor slots, are arranged on the outer surface of the rotor iron core, corresponding to the inner ring surface of the stator iron core, along the circumference; and multiple permanent magnets which are arranged in the rotor iron core. Each stator winding is a set of pole variable single winding with double poles. Each rotor winding is a short circuit three-phase wire wrapping type winding. The number of pole pairs when each stator winding is started is equal to the number of the pole pairs connected with each rotor winding, the number of the pole pairs when each stator winding is operated normally is equal to the result of subtracting the number of stator teeth by the number of the pole pairs of each permanent magnet, and the sum or difference between the number of the pole pairs when each stator winding is started and the number of the pole pairs when each stator winding is operated normally is not the integer multiple of the number of the stator teeth. According to the vernier permanent magnet motor, asynchronous self-starting of the motor can be realized, and the motor is pulled into synchronous operation when the motor approaches the synchronous speed. The motor is high in starting torque, high in output torque during stable operation and low in vibration noise during starting.

Description

technical field [0001] The invention belongs to the field of self-starting permanent magnet motors, and in particular relates to a vernier permanent magnet motor which uses a pole-changing method to realize self-starting. Background technique: [0002] Whether it is in industrial production, resource transmission or daily life, fans or water pumps are widely used. They use blades to push fluid and make it flow in a direction. These blades often use electric motors as the source of power. On the basis of 70% of China's electric motors consuming industrial electricity, the motors used for fans and water pumps account for more than 60% of all motors. It can be seen that the number of driving motors for domestic fans and water pumps is extremely large. Uses a lot of energy. [0003] The blades of fans and water pumps have three common characteristics. First, their operating speed is low and their output torque is relatively large. The motor is often connected to it through a ge...

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Problems solved by technology

[0010] However, the above-mentioned technical solutions cannot be directly applied to the vernier motors for the following reasons: (1) In order to increase the output torque, the existing vernier motors all adopt the structure of surface-mounted magnetic steel, and this structure causes even if the starting unit is added, the starting Torque is also quite low, almost does not have self-starting ability; (2) the squirrel cage winding that adopts in the prior art can not be applied in vernier motor, and it can produce very large induction current when motor steady-state operation, produces extremely Large braking torque, so the output torque and efficiency will drop sharply, completely losing the advantages of the vernier motor; (3) If the pole-changing starting scheme in the prior art is used, it will bring the same problems as using squirrel cage windings , the starting performance of the motor is still not strong enough, and the situation of "big horse and small cart" is prone to occur when using it

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