Methods and Apparatus to Improve the Performance of Universal Electric Motors
Project Leader: Ron Marusarz
Unit: College of Engineering, Dept. of Technology
Brief Description:
This invention involves the innovative use of a low-cost microcontroller integrated circuit to control the speed of electric motors which employ a commutator and brushes. This device will maintain constant motor speed with changing motor torque requirements. The advantages of a closed-loop control system are obtained without the cost of a speed-sensing transducer or the need for modification of the motor. The speed feedback information is obtained from the motor's current waveform by a novel signal processing algorithm. This device can also extend brush life, reduce electrical noise interference, and improve low-speed motor torque characteristics.
Patent Status:
U.S. Patent No. 6,759,822, issued July 6, 2004.
Potential Commercial Uses:
- Variable speed power tools such as drills, saws, sanders, or buffers where the speed and load on the motor can vary during operation.
- Commercial power tools such as steel plate cutting tools where this device can prevent motor stalling or dangerous rapid acceleration due to load changes.
- Large DC motors where this device can provide controlled ultra-slow rotation as well as extended brush life.
Contact:
Jeff Myers, Senior Technology Transfer Specialist, (618) 453-4543, fax: (618) 453-8038