| 摘要 |
A vacuum cleaner comprises a suction source comprising an impeller and a first motor 20 for driving the impeller, a cleaner head comprising an agitator and a second motor 11 for driving the agitator and a controller 24 configured to generate control signals for controlling simultaneously the excitation of the first motor 20 and the second motor 11. The first motor 20 is preferably a brushless motor, and the second motor 11 is preferably a brushed motor. The controller 24 generates at least one first control signal for controlling the excitation of the first motor 20 and at least one second control signal for controlling the excitation of the second motor 11, the first control signal causes a winding of the first motor 20 to be excited for a conduction period over an electrical half-cycle of the first motor 20, the second control signal is a PWM (pulse width modulation) signal having a constant period, and the controller 24 adjusts the conduction period and the duty cycle of the PWM signal in response to changes in a supply voltage used to excite the first motor 20 and the second motor 11. The vacuum cleaner is preferably powered by batteries 9. |
