Dust collector, motor and constant power control method and apparatus

Abstract

The invention discloses a dust collector, a motor and a constant power control method and apparatus. The constant power control method comprises the following steps: obtaining a direct current bus voltage and a direct current bus current of the motor; obtaining a direct current bus current given value of the motor according to the direct current bus voltage and a power given value of the motor; obtaining a current difference value between the direct current bus current given value and the direct current bus current; and performing PI adjustment on the current difference value so as to obtain aduty ratio signal for controlling the motor, and performing constant power control on the motor according to the duty ratio signal. According to the method, by performing PI control on the direct current bus current so as to implement the constant power control on the motor, not only is the hardware cost not increased, but a position sensor also does not need to be used and the effects of large-range power adjustment and continuous control can be implemented; and meanwhile, the problem of poor control effect due to influence of environmental factors in a production process can be effectivelyimproved, and the universality is strong.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a constant power control method of a motor, a constant power control device of a motor, a motor with the control device, and a vacuum cleaner. Background technique [0002] At present, high-speed and miniaturized brushless direct current motors (BLDC) are used more and more widely, especially in the field of small power tools (such as hand-held vacuum cleaners). When a small electric tool is powered by a battery, the battery voltage will gradually decrease with the use of time. In order to enable the device to output constant power, it is necessary to introduce a constant power control strategy during the process of battery voltage drop. [0003] In the related art, the constant power control of the motor is realized by changing the advance angle and the freewheeling angle by looking up the table. Specifically, such as figure 1 with figure 2 As shown, the input voltage of the mo...

AI Technical Summary

Problems solved by technology

For this reason, the first object of the present invention is to propose a constant power control method of the motor, by performing PI control on the DC bus current to realize the constant power control of the motor, not only will not increase the hardware cost, but also no need to use a position sensor It can achieve a wide range of power regulation and continuous control effects, and can effectively improve the problem of poor control effects caused by environmental factors in the production process, and has strong versatility

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