Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1999-03-03
2000-08-29
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68B, 318607, 318608, H02K 709, H02K 1100, G05B 102
Patent
active
061113336
ABSTRACT:
In a rotating machine with employment of a sensor-less DC brushless motor, a terminal voltage of a motor is corrected in a phase corrector by using a motor phase current signal. At this time, the terminal voltage is processed in an integrator and a comparator so as to be converted into an ON/OFF signal having a duty ratio of 1:1. Then, a rotation signal is produced based on an induced voltage which is generated by rotating a permanent magnet rotor, so that a rotation sensor is no longer required. On the other hand, an output derived from the phase corrector is entered as a 1-pulse/1-rotation output signal into a PLL circuit. The PLL circuit contains a phase comparator, a low-pass filter, an oscillator, and a counter. The PLL circuit frequency-divides the 1-pulse/1-rotation output signal. The sine wave data are stored into a ROM with respect to each of the frequency-divided signal positions. The unbalance vibrations of the magnetic bearing are controlled every frequency-divided signal.
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Endo Tsunehiro
Fukushima Yasuo
Miura Haruo
Takahashi Kazuki
Takahashi Naohiko
Dinh Le Dang
Hitachi , Ltd.
Ramirez Nestor
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