Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Load control
Reexamination Certificate
2006-04-11
2006-04-11
Martin, David (Department: 2837)
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Load control
C318S807000, C318S800000, C318S798000, C318S802000, C318S825000
Reexamination Certificate
active
07026771
ABSTRACT:
A microprocessor of the motor control apparatus acquires a zero-cross detection signal from a zero-cross detection section and a load current from a current detection section at a prescribed sampling period. The processor obtains a load current instant value every sampling period and a corresponding sine-functional value from a sine-functional value table to calculate a compensation value for the load current instant value. The processor also calculates a load current compensation total value by adding the compensation value by the predetermined number of times of sampling and compares the load current compensation total value with a load current reference value to obtain a difference therebetween. In response to the difference, an instruction value for delay time that determines the output timing of a trigger signal to a switching element is changed so that power consumption of the motor falls within a prescribed range.
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Ishizawa Akihiro
Kushida Hiroyuki
Sakurai Osamu
DLA Piper Rudnick Gray Cry US LLP
Martin David
McCloud Renata
Toshiba Tec Kabushiki Kaisha
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