Nine-phase brushless DC motor speed control system for water pump and its parallel speed controller

Abstract

The invention discloses a parallel type rotary speed controller of a nine-phase brushless direct-current motor for a water pump. The parallel type rotary speed controller comprises a first adder, a fuzzy PID (Proportion Integration Differentiation) rotary speed control module, a fractional order PID rotary speed control module, an absolute value module and a selection switch, wherein the absolute value module is used for generating different indication signals according to loading states of the nine-phase brushless direct-current motor for the water pump; the selection switch is used for controlling an output end of the fuzzy PID rotary speed control module to serve as an output end of the parallel type rotary speed controller when the indication signal represents that the loading state is on-load, and controlling the output end of the fractional order PID rotary speed control module to serve as the output end of the parallel type rotary speed controller when the indication signal represents that the loading state is no-load. A rotary speed can be controlled through selecting a proper controlling manner according to load requirements, an inhibition effect on torque ripples is improved, and an optimization effect of increasing / decreasing the rotary speed is improved. The invention further discloses a nine-phase brushless direct-current motor speed regulation system for the water pump; the nine-phase brushless direct-current motor speed regulation system comprises the parallel type rotary speed controller above and also has the effects above.

Description

technical field

[0001] The invention relates to the field of motor speed control, in particular to a nine-phase brushless DC motor speed regulating system for a water pump and a parallel speed controller thereof. Background technique

[0002] With the rapid development of production technology, brushless DC motors are more and more used in production and life. Nowadays, due to the continuous improvement of industrial production demand, people put forward higher requirements for the control effect of brushless DC motor speed control. Require.

[0003] At present, the nine-phase brushless DC motor speed control system for water pumps uses a common PID controller to control the speed, which has the advantages of simple structure and easy implementation. In the process of speed control, certain torque ripple and certain speed increase / decrease will inevitably occur, and according to different load conditions, the speed control system will need to have a better torque ripple sup...

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