# Question: What is the name of the speed control method of DC motor?

Contents

Speed of a dc motor is directly proportional to the back emf Eb and Eb = V – IaRa. That means, when supply voltage V and the armature resistance Ra are kept constant, then the speed is directly proportional to armature current Ia.

## What are the speed control methods of dc motor?

There are three main ways to achieve speed regulation in series DC motors–flux control, voltage control, and armature resistance control.

• Flux Control Method. …
• Voltage Regulation Method. …
• Armature Resistance Control Method.

## Which device is used in speed control of dc motor?

Apart from these two techniques, the most widely used technique is the speed control of dc motor using PWM to achieve speed control of a DC motor. PWM involves the application of varying width pulses to the motor driver to control the voltage applied to the motor.

## Which of the following method is used to control motor speed control?

Explanation: Series-parallel control method is superior to the rheostatic control insofar as efficiency is concerned. However, it is limited to two speed steps. The method is commonly employed for speed control of series traction motors.

## How can I reduce the speed of a 12v DC motor?

A couple of things you can do:

1. Use gears to change ratio of speed, which is what you’re going to do. …
2. Use a stepper motor, which are commonly used for high-torque, low RPM applications.
3. Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.
IT IS INTERESTING:  You asked: Where are Nascar engines built?

## What is DC motor speed?

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.

## What is starting resistance of DC motor?

In practical DC machines, armature resistance is basically very low, generally about 0.5 Ω. Therefore, a large current flows through the armature during starting.

## How can we reduce rpm of motor?

A couple of things you can do:

1. Use gears to change ratio of speed, which is what you’re going to do. …
2. Use a stepper motor, which are commonly used for high-torque, low RPM applications.
3. Find some sort of PWM control circuit to slow it down, although you probably won’t be able to get it down to 5-10RPM.