Multi-stator arc linear motor capable of reducing torque fluctuation

Abstract

A multi-stator arc linear motor capable of reducing a torque fluctuation is a three-phase alternating-current permanent-magnet synchronous arc linear motor. The motor is assembled by three stators with a same structure and one rotor. The three stators, which have a 120 DEG mechanical angle with each other in space, are installed on the rotor. The each stator is formed by a three-phase stator winding comprising an iron core. The three-phase stator windings in the three stators use dislocation phase connection to form new three-phase integrated windings U, V, W. And resistances, inductances and mutual inductances of the formed three-phase integrated windings U, V, W are equal. The three-phase integrated windings U, V, W adopt Y-shaped connection. According to the invention, the torque fluctuation caused by the asymmetric inductances of the motor stator windings can be reduced. Simultaneously, there is the certain mechanical angle between the stators so that end forces generated by the stators can be mutually offset. Therefore, the motor can generate a small torque fluctuation at a low speed. The motor can operate stably with high precision.

Description

technical field [0001] The invention belongs to the field of motor design and relates to a multi-stator arc linear motor capable of reducing torque fluctuations. Background technique [0002] For the existing tracking equipment, the direct drive method of the torque motor is mainly used at present. Since there is no intermediate transmission link in this transmission mode, higher transmission stiffness can be obtained and transmission error can be reduced at the same time. However, for the new generation of large-scale tracking equipment (above 10m) to be developed, the traditional rotating motor can no longer meet its application requirements. This transmission method has unavoidable shortcomings, mainly due to the large size of the equipment and the large moment of inertia. , the size and output torque of the required motor also increase accordingly. Therefore, an arc-shaped linear motor has been proposed for this large-scale equipment at present. Compared with a common ...

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Problems solved by technology

In this way, even if a three-phase symmetrical voltage is applied to the motor, a three-phase symmetrical current cannot be formed in the windings of the motor, resulting in the existence of high-order current harmonics in the windings, which will cause the motor to produce large torque fluctuations, especially in When the motor runs at low speed, it will cause large torque fluctuations, which will affect the tracking performance of the motor, and it is difficult to meet the application needs of large low-speed rotating equipment

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