# How can the direction of rotation of a DC motor controlled selected?

## How can the direction of rotation of a DC motor controlled selected?

Basic Bi-directional H-bridge Circuit Control input A operates the motor in one direction ie, Forward rotation while input B operates the motor in the other direction ie, Reverse rotation. Then by switching the transistors “ON” or “OFF” in their “diagonal pairs” results in directional control of the motor.

## How does a DC motor control work?

Simply put, a DC motor controller is any device that can manipulate the position, speed, or torque of a DC-powered motor. Also, unlike some AC motors, DC motors are easily reversed by simply switching their leads so that the DC current runs in the opposite direction.

How do you change the direction of rotation of a motor?

That’s right: Determining the motor’s correct rotation. We all know that the direction of rotation of a 3-phase motor can be changed by reversing two of its stator leads. This interchanging, if you will, reverses the direction of the rotating magnetic field within the motor.

### How can the direction of the DC motor be changed in microcontroller?

The IC L293D works based on the H-bridge concept. The voltage can be made to flow in either direction using this circuit (H-bridge) such that by changing the voltage direction the motor direction can be changed.

### How does motor control work?

Motor controllers are usually supplied with AC power. The power that comes in to a controller is at a set frequency. The motor controller first turns that AC to DC, then turns the DC back into AC at the right frequency. It uses a device called a rectifier to make DC current.

Are DC motors controlled by current or voltage?

Speed Control The speed of Dc motors is controlled by the current and voltage applied to the windings or armature coils. Adjusting the current flowing into the field coils will also dictate the speed of the device. Therefore, DC motors feature a proportional speed-current relationship.

## What is motor control circuit?

A motor control circuit, for the most part, is simply a. switch (or group of switches) and a motor. If you keep. the word “switch” in mind, it helps keep the intimidat- ing subject of “motor control” in its proper context.

## What is motor control example?

An example of fine motor control is picking up a small item with the index finger (pointer finger or forefinger) and thumb. The opposite of fine motor control is gross (large, general) motor control. An example of gross motor control is waving an arm in greeting.

How can you control the direction of a DC motor?

You can control a direction of DC motor by two Switches. Both S1 and S2 are normally open, push to close, press button switches. The diodes are the Red or Green. They indicate a direction.

### How does the PWM signal control the DC motor?

The PWM signal will send to the motor driver to vary the voltage supply to the motor in a desired speed. The DC Motor driver L293D is used in this project as it is a component that has dual full bridge driver where it also can control the direction of the DC motor.

### What kind of circuit is used to rotate a motor?

Single direction control. If you want to rotate your motor in only one direction, then this is the easiest way to do so. Here power transistor is used as a switch to turn a motor on or off depending upon the applied voltage at base. Its circuit is shown below. The same motor driver circuit is used in making a simple line follower robot.

What kind of transistors to use for DC motor?

Choose npn and pnp power transistors according to the current requirement of the motor under load. The above circuit works well but L298/L293D IC’s are prefered over them, as they are compact and offer PWM channels to control motor’s speed.