How does pulse width modulation control motor speed?

As its name suggests, pulse width modulation speed control works by driving the motor with a series of “ON-OFF” pulses and varying the duty cycle, the fraction of time that the output voltage is “ON” compared to when it is “OFF”, of the pulses while keeping the frequency constant.

What are the methods of speed control of induction motor?

The speed controls of three phase induction motor from rotor side are further classified as: Adding external resistance on rotor side. Cascade control method….Synchronous Speed

• V / f control or frequency control.
• Changing the number of stator poles.
• Controlling supply voltage.
• Adding rheostat in the stator circuit.

Why is PWM used to control motors?

Motors as a class require very high currents to operate. Being able to vary their speed with PWM increases the efficiency of the total system by quite a bit. PWM is more effective at controlling motor speeds at low RPM than linear methods.

What is pulse width modulation used for?

Pulse-width modulation (PWM) is a powerful technique for controlling analog circuits with a microcontroller’s digital outputs. PWM is used in many applications, ranging from communications to power control and conversion.

How is pulse width modulation used in DC motors?

Pulse-width modulation (PWM) or duty-cycle variation methods are commonly used in speed control of DC motors. The duty cycle is defined as the percentage of digital ‘high’ to digital ‘low’ plus digital ‘high’ pulse-width during a PWM period.

How is speed control of DC motor implemented?

In this project, I will show How Speed Control of DC Motor can be implemented using 555 and Pulse Width Modulation (PWM). We use DC Motors in many systems in our day to day life. For example, CPU fans, fume extinguishers, toy cars etc. are all DC Motors which are operated by DC power supply.

How does a PWM circuit control a DC motor?

The circuit is used to control speed of DC motor by using PWM technique. Series Variable Speed DC Motor Controller 12V uses a 555 timer IC as a PWM pulse generator to regulate the motor speed DC12 Volt.

Which is pulse width modulation ( PWM ) chip used?

Series Variable Speed DC Motor Controller 12V uses a 555 timer IC as a PWM pulse generator to regulate the motor speed DC12 Volt. IC 555 is the popular Timer Chip used to make timer circuits. It was introduced in 1972 by the Signetics. It is called as 555 because there are three 5 K resistors inside.