Control of a single-phase asynchronous motor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric motors
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In the device for controlling a single-phase asynchronous motor for starting and braking [1], an electromagnetic relay, a starting capacitor of the MBGO-2 or MBGCH type for a voltage of at least 400 V are used. The starting capacitor is turned on and off by the relay contacts, which burn out over time.
To simplify the control of a single-phase asynchronous motor (IM), a simple circuit is proposed (see figure).
As a starting capacitor, an electrolytic capacitor C1 is used, connected to the starting winding through a diode bridge VD1 ... VD4. When the switch SA1 is turned to the "On" position, the capacitor C1 is charged through the starting winding of the AD, and the engine starts.
After the capacitor C1 is charged, the current through the starting winding P stops, and the capacitor no longer affects the operation of the IM. When switching SA1 to the "Off" position, the charged capacitor C1 is connected to the working winding P AD. Discharging through the winding, it creates a braking torque on the IM shaft.
Details. The TV1-5 toggle switch is used as the SA1 switch for electric motors with starting current up to 2 A. Diodes VD1 ... VD4 - diode block KTs403V or 4 diodes KD105V. Capacitor C1 is an electrolytic type K50-6 or any for a voltage of 450 V. The capacitance of the starting capacitor C1 is determined at the rate of 10 microfarads per 100 W of IM power.
The device does not require adjustment.
Literature
- Kolomoytsev K.V. Device for controlling a single-phase asynchronous electric motor//Electric.- 2000.- No. 8.
Author: V.F. Yakovlev, Shostka, Sumy region
See other articles Section Electric motors.
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