JRM Vol.12 No.3 pp. 218-223
doi: 10.20965/jrm.2000.p0218


Development of a Hysteresis Amplifier with an H-bridge Drive for Self-Sensing Magnetic Suspension

Takeshi Mizuno and Yuji Ishino

Department of Mechanical Engineering, Saitama University, Shimo-Okubo 255, Urawa, Saitama 338-8570, Japan

January 21, 2000
March 15, 2000
June 20, 2000
magnetic suspension, magnetic bearing, self-sensing, sensorless, switching amplifier
A switching amplifier with an H-bridge drive was developed for self-sensing magnetic suspension. In this amplifier, switching times are controlled by a current comparator with a small hysteresis. The amplifier implemented with such hysteresis control has asynchronous characteristics so that the switching rate depends on the load impedance. When the hysteresis amplifier is used for magnetic suspension, the gap between the suspended object and the electromagnet can be estimated from the switching frequency. Since the Hbridge reverses the polarity of the voltage applied to the coil alternatively, the switching frequency is insensitive to the value of current command to the amplifier. The F/V conversion of the switching signal was used for feedback control with the result that self-sensing suspension was achieved.
Cite this article as:
T. Mizuno and Y. Ishino, “Development of a Hysteresis Amplifier with an H-bridge Drive for Self-Sensing Magnetic Suspension,” J. Robot. Mechatron., Vol.12 No.3, pp. 218-223, 2000.
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