Brushless dual-mechanical-port permanent magnet motor based on magnetic field modulation principle

Abstract

The invention discloses a brushless dual-mechanical-port permanent magnet motor based on a magnetic field modulation principle. The brushless dual-mechanical-port permanent magnet motor comprises a single stator (1), modulation rotors (4) and permanent magnet rotors (5), wherein a closing slot is formed in the surface of the stator (1); two sets of windings with different numbers of pole pairs are placed in the slot; one set of the winding is a modulation winding while the other set of the winding is a permanent magnet winding; the pole pair number PAI of the permanent magnet winding is equal to the pole pair number Pm of the permanent magnet rotors, so that the stator and the permanent magnet rotors can form a permanent magnet motor structure; and meanwhile, the pole pair number PA of the modulation winding is equal to an absolute value of a sum value or a difference value of a salient pole number Pf of the modulation rotors and the pole pair number Pm of the permanent magnet rotors, so that the stator, the modulation rotors and the permanent magnet rotors can form a magnetic field modulation motor structure. The brushless dual-mechanical-port permanent magnet motor is complex in structure, and the manufacturing difficulty is greatly lowered; and in addition, a single-stator and double-air-gap structure of the motor is more compact, so that relatively high torque density can be realized.

Description

technical field [0001] The invention belongs to the field of permanent magnet motors, and more specifically relates to a brushless dual mechanical port permanent magnet motor based on the principle of magnetic field modulation. Background technique [0002] In various fields, transmission devices that change the speed and torque of rotating parts are used. For example, the gear commonly used in industry is a device with a fixed speed and torque transmission ratio. With the development of industry, people's requirements for transmission devices are constantly increasing, and devices with variable transmission ratios are also required, that is, continuously variable transmissions. However, the transmission of this device is constrained by the power relationship, and the output power must be the same as the input power when the loss is not considered, which also limits its use. For example, in a hybrid vehicle, in order to ensure the maximum efficiency of the engine, the engin...

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Problems solved by technology

[0005] But the double-mechanical-port double-electric-port permanent magnet motor disclosed in the patent document CN105375714A also has the following deficiencies. First, the structure proposed in the patent document has two stators and two rotors with three layers of air gaps between them. The process requirements are high, and the manufacturing process is relatively complicated, and the production cost is high; secondly, the excitation magnetic field generated by the permanent magnet in this topology needs to pass through the three-layer air gap, and the reluctance of the magnetic circuit is large, resulting in a weak magnetic field and weakening the motor. torque output capacity

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