A Single Concentrated Winding Low Cost High Power Density Permanent Magnet Linear Generator

Abstract

The invention discloses a permanent magnet linear generator with low cost and high power density with single concentrated winding. The stator is evenly arranged with an even number of stator teeth, two adjacent stator teeth are provided with stator slots, the stator slot yoke and the stator back yoke There is a permanent magnet between them, and a main air gap is set between the stator teeth and the mover teeth of the mover, and the magnetic flux generated by the permanent magnet enters the mover through the main air gap to form a main magnetic flux; the permanent magnet The magnetization direction of the permanent magnets on the same stator slot yoke is the same without following the rotation of the mover, and the magnetization directions of the permanent magnets on two adjacent stator slot yokes are opposite; a set of armature windings is placed in the stator slots, By controlling the interaction between the current magnetic field of a set of armature windings and the magnetic field generated by the permanent magnet, the magnetic flux on the stator teeth is changed, and the torque is generated by the change of reluctance between the stator and the mover. The invention has only one set of windings, and only needs to control the current magnitude and direction of one set of armature windings during operation, and the power circuit only needs two power switching devices.

Description

technical field [0001] The invention relates to a permanent magnet linear generator with low cost and high power density with single concentrated winding. Background technique [0002] The linear motor drive device can directly convert the input electric energy into linear kinetic energy on the required occasion, realize linear motion, save the mechanical transmission conversion device in the traditional rotation-linear conversion drive mode, and greatly reduce the volume of the transmission device. It improves the reliability and efficiency of the whole system, and effectively reduces the cost and maintenance cost of the equipment. Not only that, but also the high speed, high precision and robustness that the traditional rotary-linear conversion drive method cannot achieve. In addition, the transmission conversion device will significantly increase the vibration and noise of the transmission system, reducing the control accuracy and performance of the system. Therefore, in...

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Problems solved by technology

[0007] In order to solve the above problems, the present invention proposes a permanent magnet linear generator with low cost and high power density with single concentrated winding. The stator of the permanent magnet motor has only one set of stator armature windings, and only one set is placed in each slot of the motor. The armature winding does not require phase-to-phase insulation in the slot, the slot fullness rate is high, and the motor winding off-line process is simple, and the overall cost is lower than the existing various three-phase induction motors and permanent magnet motors; at the same time, only one The set of armature windings passes AC current, so the control circuit of the motor only needs 2 power electronic power switching devices, which changes the existing three-phase and above armature windings on the stators of various induction motors and permanent magnet motors, requiring at least The status of 6 power electronic power switching devices effectively reduces the number of power switching devices, reduces the possibility of failure of power switching devices in the motor control circuit, and improves reliability

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