Motor rotating speed control method for food processor

Abstract

The invention provides a motor rotating speed control method for a food processor. The motor rotating speed control method comprises the steps: acquiring the actual rotating speed of a motor; determining the number of chopping points of an alternating-current half-wave according to the power modulation precision and the total work of the alternating-current half-wave, and uniformly dividing the alternating-current half-wave through the chopping points; and acquiring an alternating current zero crossing point, comparing an actual rotating speed of the motor with a preset rotating speed, determining a target chopping point corresponding to the alternating current half-waves according to a comparison result of the actual rotating speed of the motor and the preset rotating speed, and controlling conduction from the target chopping point of the alternating current half-wave. In the scheme, the alternating-current half-wave is uniformly divided. When the rotating speed of the motor of the food processor is modulated, stepless smooth adjustment of the power can be achieved, namely, equal-power control is carried out, the rotating speed of the motor of the food processor is prevented frombeing changed suddenly, and the user experience degree is improved.

Description

technical field [0001] The invention relates to the technical field of food processing, in particular to a motor speed control method for a food processing machine. Background technique [0002] With the prevalence of the concept of health preservation, food processors such as wall breakers, mixers, mills, meat grinders, and juice machines are playing an increasingly important role in people's lives. Consumers follow the trend to buy food processing machines The machine can meet the processing needs of consumers for different food materials. With the continuous upgrading of products, the performance and functional requirements of consumers for food processors are also constantly improving. [0003] At present, the adjustment and control of the power of the AC power of the food processor is basically controlled by the relay and the thyristor. Specifically, the existing scheme is mainly to compare the actual power and the target power of the food processor, and adjust the cond...

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Problems solved by technology

[0003] At present, the adjustment and control of the power of the AC power of the food processor is basically controlled by the relay and the thyristor. Specifically, the existing scheme is mainly to compare the actual power and the target power of the food processor, and adjust the conduction of the thyristor by comparing the structure. There are two main disadvantages of the existing scheme. One is that the power adjustment accuracy of the food processing machine is not high, because the existing scheme is based on the fuzzy adjustment of the conduction time of the thyristor according to the comparison result of the actual power and the target power. It is also impossible to achieve stepless smooth adjustment of power, that is, equal power control, resulting in sudden high and low power of the food processor. When adjusting the motor, the speed of the motor is high and low, and the speed control is poor. It leads to loud noise and poor consumer experience. When controlling the heating device, the temperature fluctuates up and down, resulting in poor food processing effect; the second is the ambiguity of the conduction time of the thyristor according to the comparison between the actual power and the target power. The adjustment occupies the terminal of the control unit for a long time, which reduces the processing speed of the control unit, affects the real-time operation of the food processor, and further affects the user's operating experience on the food processor

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