High power density hybrid excitation permanent magnet linear generator with ring yoke armature winding

Abstract

The invention discloses a ring yoke armature winding high power density hybrid excitation permanent magnet linear generator, which comprises a stator and a rotor, wherein the stator comprises stator yokes composed of stator groove yokes and stator back yokes; permanent magnets are arranged between the stator groove yokes and the stator back yokes; the stator groove yokes are located at the direction, close to the outer sides, of the bottom parts of the stator grooves; the stator grooves comprise armature grooves where armature windings are located and excitation grooves where excitation windings are located, the armature grooves and the excitation grooves are arranged alternatively at intervals, each armature groove is internally provided with a set of armature winding, each excitation groove is internally provided with a set of excitation winding, a main air gap is arranged between a stator tooth and a rotor tooth, the stator groove yoke above the excitation winding groove is broken and provided with an additional air gap. Through adjusting the direction and the magnitude of current inside the excitation winding, the leakage flux magnitude can be adjusted, effects of magnetic enhancement and demagnetization are achieved, the magnitude of main flux entering the rotor via the main air gap is further adjusted, and the excitation is adjusted.

Description

technical field [0001] The invention relates to a permanent magnet generator, in particular to an annular yoke armature winding high power density hybrid excitation permanent magnet linear generator. 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 ...

AI Technical Summary

Problems solved by technology

[0006] 1. The windings of existing permanent magnet linear motors are generally 3 phases, the number of stator slots is large, the process of winding off the assembly line is complicated, and the manufacturing cost is high; the permanent magnets of most existing permanent magnet linear motors are located on the mover, and they work with the mover during operation Movement, the permanent magnet needs to be fixed by a special process, the manufacturing cost is high, especially when the motor runs at a high speed, it is difficult to fix the permanent magnet, because the permanent magnet is located on the mover, it is difficult to dissipate heat during operation, temperature rise and vibration caused by reciprocating motion Will cause damage to the permanent magnet mechanical structure and irreversible demagnetization

[0007] 2. The existing permanent magnet linear generator is generally three-phase, requiring at least 6 power switching devices, such as IGBT or MOSFET, for the power inverter circuit of the motor, as well as the corresponding driving circuit and protection for driving the power switching device The circuit makes the cost of the motor power inverter circuit quite high, even reaching two to three times the cost of the motor body. The increase in the number of power switching devices increases the complexity of the control circuit, increases the possibility of device failure, and reduces the reliability of the system during operation.

[0008] 3. Most of the existing permanent magnet linear motors have permanent magnets directly facing the air gap, and the permanent magnets face the danger of not being demagnetized. Moreover, the existing permanent magnet linear motors have a large number of winding phases and a large number of inner slots in the iron core. The windings are offline during manufacturing. The process is complex, the amount of iron core is large, the mass of the motor is large, and the material utilization rate is low when the motor is running for power generation

[0009] 4. Due to the fixed magnetomotive force of the permanent magnet in the existing permanent magnet linear motor, the main magnetic flux of the motor cannot be adjusted, resulting in a narrow constant power operating range, and the voltage cannot be adjusted during power generation operation. , the number of stator slots is large, and the winding off-line process is complicated; the permanent magnets of most existing permanent magnet motors are located on the mover, and they move with the mover during operation. When it is high, it is more difficult to fix the permanent magnet. Since the permanent magnet is located on the mover, it is difficult to dissipate heat during operation. The temperature rise and the vibration caused by the movement of the mover will cause damage to the permanent magnet mechanical structure and irreversible demagnetization

[0014] In addition, the existing permanent magnet motors mostly use distributed windings or concentrated windings spanning multiple pole pitches, which generally have long winding ends, a large amount of copper, high manufacturing costs, high copper consumption during motor operation, and low efficiency. Disadvantages, especially for motors with large iron core lengths, this disadvantage is particularly prominent, it is necessary to use a special winding coil connection method to reduce the winding end, reduce the use of copper, and improve the operating efficiency of the motor

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