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Position Sensor-less Control of a Half-Wave Rectified Brushless Synchronous Motor
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| Author(s) |
Jun Oyama; Takashi Abe; Tsuyoshi Higuchi; Eiji Yamada; Kenji Shibahara |
| Abstract |
We proposed a "half-wave rectified brushless synchronous motor" as a
novel servo motor. This motor has simple and robust brushless structure and is maintenance free. This motor provides us with the torque control operation over the speed range from zero to the rated speed. We also proposed a new type half-wave rectified brushless synchronous motor with permanent magnet in order to improve the power factor and efficiency. This paper proposes a new position sensorless control system using half-wave rectified brushless synchronous motor. The emf, in the rotor winding of this motor, is induced by the mmf which rotates at synchronous speed and pulsates at bias frequency. The field poles are excited by the field current obtained by rectifying the emf with a diode inserted into the field winding. If there is any displacement between the axis of rotating mmf and the axis of the rotor, the impedance of the field circuit varies. Therefor, rotor position can be detected only by measuring bias frequency components of armature voltage. |
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| Filename: | Unnamed file |
| Filesize: | 346.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2018-04-10 by System |
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