Multi-tap winding wide speed regulation permanent-magnet synchronous motor

Abstract

The invention discloses a multi-tap winding wide speed regulation permanent-magnet synchronous motor. The multi-tap winding wide speed regulation permanent-magnet synchronous motor comprises a stator winding, wherein the stator winding is embedded onto stator teeth and comprises three phase windings, each phase winding is formed by connecting at least two coils in series, the three phase windings are connected in a triangular or star shape, and at least one switch is connected in parallel with the series coils of the phase windings. Wide speed regulation can be achieved by employing an original coil, a new winding and a mechanical device are not needed to be additionally arranged, and the motor is simple in structure and low in cost; and during low speed, each phase winding has relatively many coil turns, an enough large output torque is ensured, the coil turns of each phase winding can be reduced by controlling on / off of the switch with the increase of a rotational speed, at the moment, a counter potential generated by a permanent-magnet field in the windings is also reduced accordingly, so that the constant-power rotational speed range of the motor is expanded.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a multi-tap winding wide speed-adjustable permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors in electric vehicles and other industries not only require the motor to have a strong torque output capability to meet the power required for vehicle starting, acceleration, deceleration and other working conditions, but also have a wide speed regulation range to adapt to The demand for high-speed cruise of electric vehicles. The back electromotive force of the permanent magnet synchronous motor increases with the increase of the speed until it reaches the limit of the output voltage of the inverter. At this time, if the control method is not adjusted, the speed will not continue to increase. In order to be able to operate in a larger range above the rated speed, the motor is often subjected to field-weakenin...

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Problems solved by technology

However, the speed expansion of weak field is more suitable for the built-in permanent magnet motor, and the speed expansion range is limited, and it will also bring problems such as increased copper consumption of the motor and reduced efficiency.

[0003] In addition, there are some methods of switching between double windings or adding mechanical devices to change the magnetic field to realize the wide speed regulation operation of the motor, but these methods increase the cost, the operation is difficult, and the practical application value is not great.

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