What are the working principles and applicable working conditions of electromagnetic speed-regulating motors?

Update:24 Aug 2020
Summary:

Working principle and applicable working conditions of […]

Working principle and applicable working conditions of electromagnetic speed regulating motor

The electromagnetic speed-regulating motor consists of a single-speed or multi-speed squirrel-cage asynchronous motor and an electromagnetic slip clutch. It is also often referred to as a slip motor and is a constant-torque AC continuously variable speed motor.

The core of the electromagnetic speed control motor is the electromagnetic slip clutch. The claw poles with relatively fixed polarity and alternately distributed N and S poles rotate under the drag of an asynchronous motor. The solid armature cuts the magnetic field lines to induce eddy currents, and the claw poles magnetic field Rotate under the action of, drive the output shaft to output mechanical power.

By adjusting the size of the claw pole excitation current, the coupling degree or speed difference between the eddy current magnetic field and the claw pole magnetic field can be adjusted to realize speed regulation. If the solid armature is synchronized with the rotation speed of the claw pole magnetic field, it is impossible to induce an eddy current, and the solid armature loses the driving force of rotation-electromagnetic force, so it is also called an electromagnetic slip speed motor. It is not difficult to imagine that this type of motor is a combined structure, which is mainly composed of a drag motor, an electromagnetic slip clutch and a tachometer generator. The tachometer generator feeds back the speed signal to the controller, and compares it with the speed set by the controller, and sends out an adjustment. Instructions to increase or decrease the speed of the solid armature.

Electromagnetic speed regulation motor has excellent speed regulation characteristics with wide speed regulation range, smooth speed regulation, large starting torque, and low control power. The controller, tachogenerator and other speed testing and feedback components form an automatic regulation system, with easy speed regulation and control A series of advantages such as reliability, high mechanical properties and hardness, so it is widely used in mechanical equipment that requires stepless speed regulation, such as printing presses and staplers, wireless binding, high-frequency drying linkages, chain boiler grate control and other mechanical equipment.

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