Constant rotation speed generating device for detecting elevator speed limiter tester

At present, the commonly used standard speed generating device is generally composed of a controller, a driver and a gearbox. A stepper motor is used as the main actuator motor, and the dynamic rotation of the stepper motor is controlled by an open-loop frequency conversion speed regulation method. In order to expand the speed range, The stepping motor speeds up or decelerates by driving a high-precision gear box, and outputs the corresponding standard speed on each output shaft of the gear box. The speed output accuracy is very high and the speed range is large, but the disadvantage of this method is The cost is high, the volume is large, and the weight is heavy, so it is inconvenient to carry; and, in the process of generating the standard preset speed (maybe more than one standard speed), the speed result that needs to be set cannot be generated at one time, and finally if you need to know the For the linear velocity of the belt wheel, a table corresponding to the rotational speed and linear velocity should be listed for secondary calculation, and the detection efficiency is not high.