Rotation speed standard device

The utility model discloses a rotation speed standard device which is used for checking a rotation speed meter or a rotation speed sensor. The device comprises a main control box and a motor platform assembly; a signal regulation unit collects the code disc rotation speed signal of a motor and outputs a regulated rotation speed signal F to a width modulation control unit; after the width modulation control unit compares a received standard frequency given signal F and the regulated rotation speed signal F, the width modulation control unit outputs a locking phase control signal F to a mod converting unit so as to drive the motor; when the output F is high-level, the motor speeds up to run; when the F is low-level, the motor is power-off and slides; until the impulse of the F is equal to the impulses of the F and the>F, the motor can stably run at a required rotation speed. The rotation speed standard device can realize stable rotation speed, high accuracy and strong loading ability in the range of full rotation speed; the range of rotation speed output by an actuating mechanism is 2-30000 r/min.