Motor driver

Details Motor driver Motor driver

2006-06-20

2006-06-20

Masih, Karen (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S800000, C318S803000, C318S805000, C318S806000

Reexamination Certificate

active

07064516

ABSTRACT:
While the motor drive amplifier is not operating, electromagnetic switch contacts are held closed for a predetermined period of time, three-phase power is rectified by a rectifier circuit and a smoothing capacitor is charged. Then, the smoothing capacitor is discharged through a discharging resistor and, when a predetermined voltage is reached, a contact is closed, with the result that a closed circuit is formed by the smoothing capacitor, a detection resistor, a motor coil, motor insulation resistance, and ground. A voltage generating across the detection resistor due to leakage current is detected and compared with a reference value. If the detected voltage exceeds the reference value, an insulation degradation signal is delivered.

REFERENCES:
patent: 5430636 (1995-07-01), Kachi
patent: 6437575 (2002-08-01), Lin et al.
patent: 6445598 (2002-09-01), Yamada
patent: 2003/0043610 (2003-03-01), Akita et al.
patent: 0 571 657 (1992-09-01), None
patent: 5-336759 (1993-12-01), None
patent: 10-221395 (1998-08-01), None
patent: 2001-141795 (2001-05-01), None
patent: 2003-098217 (2003-04-01), None
patent: 2003-177754 (2003-06-01), None

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