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Does PWM change torque?
Thus the PWM is NOT affecting the torque (and the current) but only the speed (and the voltage).
How do you control motor torque?
The torque is controllable up to the maximum rated torque of the motor, and is controlled by varying the armature (and if a shunt wound motor, the field) current. Maximum sustainable torque is achieved at full rated current on the armature (and field).
Why do motors need PWM?
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.
Can a PWM control the speed of a DC motor?
By using PWM we can easily control the average power delivered to a load and by thus we can easily control the speed of the DC Motor. You may think that a variable resistor in series with a DC Motor can control its speed. There are three reasons for “Resistor is not a good choice for controlling the speed of a DC Motor”.
Can a PWM be interfaced with a microcontroller?
MikroC Pro for PIC Microcontroller provides built in library routines for PWM which makes our task very simple. Please refer the following articles. In this example project DC Motor is interfaced with PIC Microcontroller using L293D Motor Driver.
How to control DC motor using PIC microcontroller?
In this example project DC Motor is interfaced with PIC Microcontroller using L293D Motor Driver. Two Push Button switches are provided to control the speed of the motor. Here we are using 12V DC Motor and average DC value delivered to motor can be varied by varying the duty ratio of the PWM.
Can a resistor control the speed of a DC motor?
There are three reasons for “Resistor is not a good choice for controlling the speed of a DC Motor”. The main problem is that the motor is a varying electrical load so a resistor can’t do this task. It needs more power during start up than in running state.