Control circuit of vacuum cleaner motor

Abstract

The invention discloses a control circuit of a vacuum cleaner motor. The control circuit comprises a power supply, a voltage control module, and a motor. The motor can be a DC or AC motor. The voltage control module is arranged between the power supply and the motor. Power output voltage is converted into motor input voltage by the voltage control module. The voltage control module may adjust the motor input voltage in order to maintain the power of the motor at a constant value. The control circuit is provided with the voltage control module. When the air inlet of the vacuum cleaner is stuffed, load is decreased and thus current is decreased. Then, the voltage control module increases the motor input voltage so as to increase the rotating speed of the motor and further increase the vacuum degree of the vacuum cleaner, thereby achieving power compensation of the motor and providing the vacuum cleaner with powerful suction.

Description

technical field [0001] The invention relates to a vacuum cleaner, in particular to a vacuum cleaner with a control circuit. Background technique [0002] The traditional vacuum cleaner control circuit uses an AC-DC series motor as the load, and the control unit generally uses a bidirectional thyristor (thyristor) to adjust the speed through a resistance-capacitance phase-shift trigger or a single-chip microcomputer control phase-shift trigger circuit. The electromotive force balance equation of the series motor is: U=kΦN, where k is a constant. When the vacuum cleaner is blocking the suction port, the current drops due to the load reduction, and the current drop causes the stator magnetic flux Φ to drop. In the case of constant U, in order to reach the potential Balanced, the speed of the motor increases, thereby enhancing the suction. Generally, vacuum cleaners use this feature of the series motor to achieve the purpose of increasing the speed of the motor when the vacuum c...

AI Technical Summary

Problems solved by technology

[0004] For DC permanent magnet motors (including DC brushed motors and DC brushless motors), since their stators or rotors are permanent magnets, the electromotive force balance equation is: U=CeΦN+Ia(Ra+Rc), when the vacuum cleaner is blocking the suction port due to The load reduction makes the current Ia drop. Since the resistance of Ra+Rc is very small, the change of Ia(Ra+Rc) in the equation is also very small; since Ce is a constant, the main magnetic flux Φ does not change, and U remains unchanged. The rotation speed of the motor increases very little, so that the rotation speed cannot be increased to ensure the vacuum degree of the whole machine

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