Electrical Machines

Speed Control of a DC Compound Motor

A compound motor is a combination of a series and a shunt-wound motor.

Compound-wound motor (long shunt)
Compound-wound motor (long shunt)
Compound-wound motor (short shunt)

The Speed-torque characteristics for a compound motor

Compound motor characteristics

Speed Control of a DC Compound Motor

Speed is controlled by variable resistors in the shunt field and armature circuit. The series winding may be arranged that it aids the shunt field (cumulative compound) or opposes it (differential compound).

Speed control of a DC compound motor (long shunt type)

Cumulatively compounded motors are similar in characteristics to series motors, while differential compounded motors are similar to shunt motors as shown in the figure below:

Characteristics of cumulatively & differential compounded motors

Starting a DC Compound Motor

The compound motor is started with the help of a dc face-plate starter.

Applications of DC Compound Motors

Compound motors are used in applications where a wide speed range is needed but the differentially compounded types are rarely used as they tend to be unstable. The cumulatively compounded types are suitable for heavy machine tools.

John Mulindi

John Mulindi is an Industrial Instrumentation and Control Professional with a wide range of experience in electrical and electronics, process measurement, control systems and automation. In free time he spends time reading, taking adventure walks and watching football.

View Comments

Recent Posts

Charging Ahead: Ensuring Your Gear is Compatible with Electric Vehicles

Image source Pixabay Many drivers assume that transitioning to an EV is just about swapping…

4 days ago

What is an Integrated Circuit (IC)?

Image source Pexels An integrated circuit (IC) is a circuit in which components such as…

7 days ago

The Problems Associated with Embedded Power Generation

Image source Pixabay The rate of the development of energy sources that are alternatives to…

3 weeks ago

The Power of Automation in Construction: How It Transforms Efficiency and Safety

Image by Pixabay Automation is transforming industries worldwide, and construction is no exception. Companies are…

3 weeks ago

LED Beacon Lights: What Does Each Colour Lens Mean?

A closeup shot of a warning lamp in the street at night, image by Freepik…

3 weeks ago

Impeller Flowmeters: Features, Installation Considerations & Uses

Impeller flowmeters at times referred to as paddlewheel meters are one of the frequently utilized…

4 weeks ago