Rotating speed detection and control device of series excitation type motor

The invention relates to a rotating speed detection and control device of a series excitation type motor, which belongs to the field of motor control equipment, and comprises a power supply loop for supplying power to the motor by the series excitation type motor, and a current detection module electrically connected to the power supply loop and used for detecting a motor commutation current signal, the amplifying and shaping module is electrically connected to the current detection module and is used for amplifying and shaping the commutation current signal; the processing module is used forreceiving the signal of the amplifying and shaping module and calculating the rotating speed of the motor; a rotating speed control module is arranged between the processing module and the motor and used for receiving and responding to control signals of the processing module and adjusting the rotating speed of the motor. The method has the effect of detecting the rotating speed of the motor without the help of a Hall ele