Question: How can the speed of a DC motor be controlled?

Why do we control speed of DC motor?

DC Motors plays an important role in energy conversion process. It is a machine which converts electrical energy into mechanical energy. In mechanical system, speed varies with number of task so speed control is necessary to do mechanical work in a proper way. It makes motor to operate easily.

Can you adjust motor speed?

The most common and efficient way of changing the speed is to vary the frequency by using an inverter as the power supply. … Add a variable resistance in the motor circuit to reduce the voltage across the main winding if an inverter is too costly and accurate speed control is not required.

How do you increase motor speed?

Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints. The first is the saturation of the magnetic circuit, but this issue can be significantly avoided by keeping the V/f ratio constant.

What is the speed of a DC motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

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What is base speed of DC motor?


The base speed of a motor is the nameplate speed at the rated voltage and full load. load varies from no load to full load over the stated speed range. Example: 1% of base speed is 17.5 RPM.

When the speed of DC motor is increased?

Complete answer:

From the equation. (3) we can say, speed is inversely proportional to armature current. Thus, when the speed of the dc motor is increased, the armature current will decrease.

Which is not a DC motor controlling method?

Which of the following is not the method of speed control in DC series motor? Explanation: Diverter means adding a variable resistance in parallel with field winding. Tapped field control is the method where field ampere turns are adjusted in steps by varying the number of turns included in the circuit.