Rotor double-winding pole-changing asynchronous starting vernier motor

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0022] The invention provides a pole-changing asynchronous start vernier motor with dual rotor windings, such as figure 1 As shown, it includes a stator and a rotor; where the stator includes a stator core 1 and a stator winding 3, and the rotor includes a rotor core 2, a rotor damper winding 5, a rotor start winding 6 and a permanent magnet 4.

[0023] The stator core 1 is ring-shaped, and its inner ring surface is provided with a plurality of opening slots as stator slots along the circumferential direction to accommodate the stator winding 3; the rotor core 2 is coaxially sleeved in the stator core 1, and is opposite to the stator core The outer surface of the inner ring surface of the core 1 is provided with a plurality of rotor slots along the circumferential direction. The top of the rotor slot is used to accommodate the rotor damper winding 5, and the bottom of the rotor slot is used to accommodate the rotor start winding 6; a plurality of permanent magnets 4 are arranged in the rotor core 2 .

[0024] The stator winding 3 is a pole-changing single winding with a bipolar number, and the rotor damper winding 5 and the rotor starting winding 6 are wound double windings.

[0025] Specifically, the number of pole pairs of the rotor starting winding is the same as the number of stator winding pole pairs when the stator is started, and the number of pole pairs of the rotor damper winding is the same as the number of permanent magnet pole pairs.

[0026] Specifically, when the number of stator slots is greater than the number of permanent magnet pole pairs, the sum of the number of pole pairs of the stator winding and the number of permanent magnet pole pairs is the number of stator slots; when the number of stator slots is less than the number of permanent magnet pole pairs, the stator winding The sum of the number of pole pairs and the number of stator slots is the number of permanent magnet pole pairs.

[0027] Specifically, the number of pole pairs when the stator winding is started is less than the number of pole pairs during normal operation, and the number of pole pairs when the stator winding is normal is less than the number of permanent magnet pole pairs.

[0028] Specifically, the permanent magnet may be a surface mount type or a built-in type, that is, a common straight-shaped, V-shaped, W-shaped, or Spoke-shaped. In this embodiment, the permanent magnet adopts a V-shaped built-in type.

[0029] Specifically, there are multiple stator slots, which are evenly distributed along the circumferential direction of the inner ring surface of the stator iron core; and the rotor slots are multiple, and are evenly distributed along the circumferential direction of the inner ring surface of the rotor iron core.

[0030] When the stator winding changes poles during starting, the number of pole pairs is different from the number of pole pairs in steady state. In order to ensure that positive starting torque can always be provided throughout the starting interval, the number of pole pairs during starting should be less than the number of permanent magnet pole pairs Pe In the asynchronous starting vernier motor in this embodiment, the number of stator slots N is 6 and the number of permanent magnet pole pairs Pe is 5. Then the number of pole pairs Pa of the stator winding in the steady state is 1, and the number of stator pole pairs is 2 when starting. , The number of pole pairs of the rotor starting winding is 2, and the number of pole pairs of the rotor damping winding is 5. The winding connection is as figure 2 Shown. When starting, switch S2 is closed and S1 is opened. At this time, the number of pole pairs of the stator winding is 2, which is lower than the number of permanent magnets of 5, and the number of pole pairs of the rotor starting winding is 2, and the two sets of windings interact to start. When the steady-state synchronous speed is near, S1 is opened and S2 is closed. At this time, the number of pole pairs of the stator winding is 1, which satisfies Pa=|N±Pe|, the synchronous speed is 60f/Pe in the steady state, and the number of pole pairs of the rotor damper winding It can play a damping role for Pe, and the hourly speed is stable at the synchronous speed.

[0031] Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.