MadSci Network: Engineering

Re: What if we use permanent magnets of double strength in dc motors?

Date: Thu Mar 23 14:59:02 2006
Posted By: Chris Seaman, Staff, Electrical Engineering, Materials Engineering, Alcoa Technical Center
Area of science: Engineering
ID: 1142011456.Eg

Increasing the strength of the magnet will change the performance of the motor. Unfortunately, this comes at a price. One can get rare earth magnets that have much stronger fields, but these can be significantly more expensive. The energy savings may be less than the cost of the magnet.

Also, for a particular application, it may not be possible to get a permanent magnet that is strong enough. In this case the motor must be designed using an electromagnet. The strength of the magnetic field is controlled by the "field current" and the motor speed is controlled by the "armature current".

There is a wealth of information on the 'net regarding DC motors. I've attached a few links for you to follow and read about some of the design constraints and trade-offs for DC motors.

I hope this helps.

Chris Seaman
Alcoa Technical Center

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