Although the speed control circuit described in this paper is very simple, it can accurately adjust the speed of the motor whose working current does not exceed 1A.
As shown in the figure below, the NE555 is used as an oscillator, and the pulse frequency of its output (pin 3) can be adjusted within the range of 5-12 Hz. The adjustment range is determined by the values ​​of R1 and C1. A power output stage control motor is formed by transistors T1 and T2. AJ1 and P1 can control the oscillation frequency of 555. There are two modes of "speed control" and "speed change" to choose from. The "speed" mode is to set P1 to a certain frequency and let the motor rotate at a certain speed. The “shift†mode uses the automatic control method to continuously adjust P1 to make the motor change the speed at any time.
Simple motor speed control circuit
Air conditioner Contactor is mainly applicable to a line of AC 50Hz or 60Hz,rated working voltage up to 600V and rated working current up to 60A,used to close or switch off the line.The Coil Insulation is Class B(130℃),can be operated with 85% of nominal coil voltage or 110% maximum safe operate.
Air conditionar Contactors are definite purpose:AC contactor are designed for use in refrigeration,and electric heating systems.Power connections can be made with either screw terminals with quick connects or lug terminals with quick connects.
Air Conditioner AC Contactor,3 Phase AC Contactor,Electrical Air Conditioner Ac Contactor,Air Conditioner AC Magnetic Contactor
Ningbo Bond Industrial Electric Co., Ltd. , https://www.bondelectro.com