Verification device and method for system precision of vertical dynamic torque ripple testing machine

A verification device for the system precision of a vertical dynamic torque ripple testing machine comprises a servo motor, a speed reducer, a torque sensor, a shaft, a coupling and a wire wheel which are connected in sequence, and the wire wheel is fixed on the plane of a machine table through a support. The device further comprises a switch type powerful magnetic attraction base fixed to the plane of the machine table through a support, a fixed pulley is arranged above the magnetic attraction base and connected with the line wheel through a thin line, and the other end of the thin line is connected with a weight. The physical characteristic that the gravity of the weight generates constant torque is utilized, mechanical structures such as a wire wheel and a fixed pulley are additionally arranged, the gravity of the weight is converted into the constant torque to be applied to the torque sensor, the use of a complex and expensive standard torque source is avoided, and the cost is reduced. And the cost and th