Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-10-25
1998-01-06
Sircus, Brian
Electricity: motive power systems
Limitation of motor load, current, torque or force
318803, H02P 763
Patent
active
057059047
ABSTRACT:
A frequency converter device comprises a first converter 5 in a pulse-width modulation system for converting an AC voltage into a DC voltage; a second converter 2 in a pulse-width modulation system for supplying an AC voltage with a variable voltage and a variable frequency to a motor; a capacitor 15 connected between an output side of said first converter 5 and an input side of said second converter 15; a current suppressing circuit connected to the input side of said first converter 5 and consisting of a resistor 31 and a relay 32; a detection circuit 19 for detecting the presence or absence of the power supply inputted to said first converter 5; a circuit 16 for measuring the voltage across said capacitor 15; a drive control circuit 30a for stopping the conversion of said first converter 5 when power failure of an input power supply occurs and when the voltage across the capacitor is not smaller than a prescribed value, continuing the drive state of the relay 32 and said second converter 2, thereby continuing an output.
REFERENCES:
patent: 5212431 (1993-05-01), Origuchi et al.
patent: 5245256 (1993-09-01), Cassat et al.
Mitsubishi Denki & Kabushiki Kaisha
Sircus Brian
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