Rotor slippage complementary exciting permanent-magnetic brushless variable speed motor

Abstract

The invention discloses a rotor slippage complementary exciting permanent-magnetic brushless variable speed motor. A rotor of the motor is connected with a motor rotating shaft through a spline and can move along the axial direction; two groups of polarity-complementation exciting magnetic sources are arranged on the periphery of the rotor side by side, wherein one group is main flux source exciting bodies, and the other group is secondary flux source exciting bodies; the main and the secondary flux source exciting bodies are arranged with alternated polarities by permanent magnets with the same number respectively to form rings; the polarity distribution on the circumference of the secondary flux source exciting bodies is spaced by one polar distance from the polarity distribution on the circumference of the main flux source exciting bodies; a roller path disc is fixedly connected on the motor rotating shaft, and the roller path disc and a conical cavity at one end of the rotor form a wedge-shaped space; and a plurality of rollers for pushing the rotor to move along the axial direction by eccentric motion are arranged in the wedge-shaped space. In the invention, the rotor moves along the axial direction to reduce the flux so as to change the torque/rotational speed property of the motor and realize speed variation, which improves the mechanical property of the permanent-magnetic brushless variable speed motor per se, enlarges the full-power speed adjusting range of the motor, keeps the volume of the motor and saves the production cost.

Description

technical field [0001] The invention relates to a permanent magnet brushless motor, in particular to a rotor slipping complementary excitation permanent magnet brushless variable speed motor designed for electric drive of electric vehicles and machine tools. Background technique [0002] In the existing technologies and products, the driving motors used as electric power mainly include induction motors (IM), permanent magnet brushless motors (PLDCM), permanent magnet synchronous motors (PMSM) and switched reluctance motors (SRM). Induction motors and switched reluctance motors, permanent magnet brushless motors (PLDCM) are compact in structure, have the largest specific power in volume and weight, high efficiency, easy manufacture and maintenance, and are used more and more. However, due to the use of permanent magnets for excitation, this kind of motor is difficult to adjust the magnetic flux under the existing structure, and cannot adjust the speed with constant power. Th...

AI Technical Summary

Problems solved by technology

Using an electronic controller to weaken the magnetic field, the current consumption is large, and the volume is large, resulting in higher energy consumption and production costs, which will inevitably increase the production cost of the enterprise and increase the economic burden of the user.

Moreover, the cold and heat resistance of the electronic controller is weak, and it is prone to failure when working in different environments.

The other is the method of compound excitation using current and permanent magnets. This kind of motor increases the excitation winding and circuit, and also consumes power

For example, the CLC number: TM301.2, TM351 document code: A, article number: 1007-7162 (2004) 04-0001-04 "Application of New Adjustable Magnet Permanent Magnet Brushless DC Motor in Electric Vehicles" As mentioned, due to the complex structure of the motor using this method, the cost increases and other factors, the technical effect is also unsatisfactory

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