Oil-smoke exhauster and its motor control device

The invention relates to an oil-smoke exhauster and its motor control device. The motor of the oil-smoke exhauster includes multiple winding sets at adjacent direction angles of single-circle rotational direction. The motor control device includes a smoke detector and a main controller. The smoke detector is configured to generate an analog signal in response to the amount of the oil/smoke and feed the analog signal to the main controller. The main controller is configured to adjust a duty cycle of a PWM signal according to the analog signal magnitude. At the directional angles corresponding to the single circle rotation of the motor, the main controller generates multiple corresponding driving signals. The frequency and the duty cycle of each driving signal are the same as the ones of the corresponding PWM signal. Two signals with overlapped time sequence are used to trigger a driving power source to conduct the two winding sets of the motor.