Motor frequency conversion equipment, driving device and control circuit

The invention relates to motor frequency conversion equipment, a driving device and a control circuit. The motor frequency conversion equipment comprises a motor and the driving device. The driving device is applicable to driving of the motor and comprises a driving voltage generation circuit and the control circuit. The driving voltage generation circuit is controlled by multiple switch signals to output multiphase driving voltage for driving the motor. The control circuit comprises a processor, and the processor is electrically connected to the driving voltage generation circuit and used for pre-storing a preset speed value, receiving a feedback speed value relevant to the motor rotational speed to generate multiple control signals, subjecting the control signals to pulse-width modulation to generate switching signals, and judging whether the feedback speed value is smaller than the preset speed value or not so as to determine whether the control signals are set as trapezoidal waves respectively or not. The trapezoidal waves are used for reducing harmonic waves of the driving voltage so that the motor can be operated stably at a high speed.