Stator core coil axially adjustable brushless permanent magnet motor and its control system

Abstract

The invention discloses an axially adjustable brushless permanent magnet motor with a stator core coil and a control system thereof. The motor includes a motor casing, a permanent magnet rotor and a stator core axially movably installed on the inner wall of the motor casing Coil, the system includes: the motor, an AC / DC rectification unit, a control unit, and a voltage sampling unit; the voltage sampling unit collects the output voltage of the AC / DC rectification unit and transmits it to the control unit, and the control unit controls the output of the servo drive unit. In the present invention, the position of the stator core coil relative to the permanent magnet rotor is moved axially to change the effective magnetic flux of the stator core coil, and the control unit in the power supply control system controls the position of the stator core coil by collecting the voltage output of the motor. The power generation output of the motor is adjusted by feedback, and the stable voltage and power output of the brushless permanent magnet motor can be realized when the motor rotor speed is higher than the rated speed and the speed changes dynamically.

Description

technical field [0001] The invention relates to the technical field of permanent magnet motors, in particular to a brushless permanent magnet motor / generator and a control system thereof with axially adjustable stator core coils. Background technique [0002] Motor (English: Electric machine, commonly known as "motor") refers to an electromagnetic device that converts electrical energy into mechanical energy or mechanical energy into electricity (transmission) according to the law of electromagnetic induction. It is represented by the letter M (D in the old standard) in the circuit. When it is used as a motor, its main function is to generate driving torque and speed, as a power source for electrical appliances or various machinery. The permanent magnet motor needs to be driven by a controller; or it is called an electronic commutator (Electronic Commutator), which is represented by the letter G in the circuit as a generator. Its main function is to convert mechanical ener...

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Problems solved by technology

[0004] Because in reality, the external force driving the generator rotor has uncontrollable factors (such as uncontrollable wind force in wind power generation, uncontrollable water flow in hydropower generation, etc.), or in a specific application, the driving generator rotor The drive of the generator is variable (for example, the variable change of the engine shaft in automobile power generation), so the voltage generated by the generator fluctuates greatly, which is not conducive to converting it into a stable voltage for daily use. In the existing technical solutions, a mechanical motor is installed on the rotor. The technical scheme of the gear transmission changes the speed ratio of the gear in time according to the change of the external force to ensure the stable speed of the rotor, but this scheme has the problems of heavy volume and high maintenance cost

Some technicians have also proposed the idea of ​​using a DC-DC converter to obtain a stable voltage, but the problem with this technical solution is that the voltage conversion efficiency of DC-DC under high current is not excellent, and the range of convertible input voltage is limited. , the reliability is poor, and the effect of practical application is not ideal

The other is a DC brushed excitation generator (Alternator). The internal combustion engine continues to run to drive the generator, and the rectified DC output is used to charge the battery and supply power to other systems. The coexistence of the two motors will undoubtedly increase the size and cost of the car, which is not conducive to Reduce the weight of the car, and work efficiency also needs to be improved

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