Motor drive unit

Details Motor drive unit Motor drive unit

2005-04-05

2008-08-05

Masih, Karen (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

C318S400210, C318S400310, C318S701000, C318S782000

Reexamination Certificate

active

07408318

ABSTRACT:
A motor drive unit is adapted to detect a motor lock-up condition (in which an electric motor is accidentally locked during driving) based on the fact that motor drive current increases in that event. Then, a capacitor for generating a voltage signal is charged with an arbitrarily adjustable charging current to overcome the motor lock-up. To do this, an IC is formed to incorporate therein such components as a first discharging circuit for discharging the electric charge of the capacitor and a hysteresis-type comparison circuit for comparing the charging current with a threshold level to thereby adjust the charging current suitable for the motor used. Such a versatile IC as described above enables adjustment of the motor startup trial period for individual motors having different characteristics.

REFERENCES:
patent: 2006/0109702 (2006-05-01), Weightman
patent: 07-131995 (1995-05-01), None
patent: 09-051189 (1997-02-01), None
International Search Report issued in the corresponding International Application No. PCT/JP2005/006993, mailed on Jun. 14, 2005.

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