Motor Control

From the Technology Enhancement Programme (TEP), these circuits allow students to build a range of devices. Each circuit has a full circuit diagram, component list and explanation of how the circuit works. This section covers a range of circuits that can be used to control an electric motor.

Motor speed control (transistor)
With this circuit, the speed of a motor can be increased or decreased by adjustment of a variable resistor.

Motor speed control (mark space)
The speed at which a DC motor is rotating can be increased, or decreased as required.

Stepper motor (single step)
This circuit demonstrates how a stepper motor is made to rotate and how its direction of rotation can be reversed.

Stepper motor (multi-step)
This circuit switches on for a certain time and during this period a certain number of pulses are fed to the driver unit to turn the motor through a certain number of degrees. The circuit also has the facility to reverse the motor.

Motor reversal
This circuit is used to reverse the direction of rotation of a motor.

Instant stop (motor)
When a relay is deactivated, the motor will stop instantly.

Motor reversal instant stop
This circuit controls the direction of rotation of the motor, and also provides an instant stop facility.

Motor (on for a period)
A motor is switched on for a predetermined period, and then switches off automatically.

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Please be aware that resources have been published on the website in the form that they were originally supplied. This means that procedures reflect general practice and standards applicable at the time resources were produced and cannot be assumed to be acceptable today. Website users are fully responsible for ensuring that any activity, including practical work, which they carry out is in accordance with current regulations related to health and safety and that an appropriate risk assessment has been carried out.

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