Motor protective device

Details Motor protective device Motor protective device

2007-03-21

2009-11-24

Leykin, Rita (Department: 2837)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S031000, C318S432000, C318S434000, C701S041000, C701S042000

Reexamination Certificate

active

07623327

ABSTRACT:
A heating value calculation part obtains a substantial heating value based on the difference between a heating value and a radiating value attributed to a motor supply current. The radiating value is obtained by a difference between a motor estimation temperature Td and an ambient temperature Tm. The heating value is cumulated in the heating value calculation part and the cumulated value is inputted to a cumulated buffer. A cumulated value TS which is obtained by adding an initial temperature T0to the cumulated value Td is inputted to a target current value ratio map and a target current value upper limit map. One of the target current values is selected and the selected target current value is inputted to a current feedback control part. The current feedback control part controls a motor output part such that the motor supply current is converged to the target current value.

REFERENCES:
patent: 4771843 (1988-09-01), Shimizu
patent: 6321695 (2001-11-01), Yoo et al.
patent: 6876606 (2005-04-01), Kajino et al.
patent: 7091686 (2006-08-01), Kagei
patent: 7203583 (2007-04-01), Fujimoto et al.
patent: 2004/0194466 (2004-10-01), Kawamura et al.
patent: 2006/0260304 (2006-11-01), Ishiwatari
patent: 2005-324796 (2005-11-01), None

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