Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-02-14
2006-02-14
Duda, Rina (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S599000, C318S254100, C318S132000, C318S432000, C318S434000
Reexamination Certificate
active
06998815
ABSTRACT:
A motor drive control apparatus includes a motor, a power supply, a control circuit, a first current detector, a first switching element, and a second switching element. The first current detector generates a first detection voltage indicating a first current flowing through the motor in one direction. The control circuit generates a PWM voltage and generates an ON voltage if the first detection voltage is lower than or equal to a first specified input voltage, and the control circuit generates an OFF voltage and generates the PWM voltage if the first detection voltage is higher than the first specified input voltage to adjust a pulse duty of the PWM voltage in accordance with a difference voltage between the first detection voltage and the first specified input voltage and to control the current flowing through the motor so as to be equal to a target current.
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