Electricity: motive power systems – Battery-fed motor systems
Reexamination Certificate
2006-07-11
2009-12-08
Masih, Karen (Department: 2837)
Electricity: motive power systems
Battery-fed motor systems
C318S471000, C318S782000
Reexamination Certificate
active
07629755
ABSTRACT:
When it is determined that a battery temperature is lower than a threshold value, an inverter control circuit alternately switches an operation point of an AC motor between an optimum operation point and a motor loss increase point. At the motor loss increase point, an increase in the amplitude of the motor current increases copper loss occurring in the three-phase coil of the AC motor. On the other hand, at the optimum operation point, a reduction in the amplitude of the motor current reduces copper loss. Corresponding to the cyclical increase/reduction in the copper loss, the battery is cyclically charged/discharged by the electric power corresponding to the copper loss. The change in the battery current occurred by the charge/discharge causes the internal resistance to generate heat, whereby the temperature of the battery is increased. The foregoing temperature increase operation is prohibited when the motor temperature exceeds an allowable temperature with which the operation efficiency of the AC motor is ensured.
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Masih Karen
Oliff & Berridg,e PLC
Toyota Jidosha & Kabushiki Kaisha
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