EP0009783A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A system for driving a motor by a pulse width modulation inverter
Assignee: Fanuc Corp
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Filing: 1979-09-28
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Granted: —
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Expires: 1999-09-28
Abstract
Abstract A system for driving an alternate current motor including a pulse width modulation inverter having the two-range driving characteristics, wherein the motor is driven by the pulse width modulation output having a simulated sine wave form (PWM (1), PWM (2)) at the speed lower than the base speed of the motor and by the pulse width modulation output having a rectangular wave form (PWM (3), PWM (4)) at the speed higher than the base speed of the motor.
Inventors
- 👤 Shigeki Kawada
- 👤 Hiroshi Ishida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:27
CPC Classifications
H; H02; H02P; H02P27/00; H02P27/04; H02P27/06; H02P27/08; H02P23/00; H02P23/0004; H02P23/0027
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
A system for driving an alternate current motor by a pulse width modulation inverter connected to a current source, in whicn the torque of the motor is limited within a predetermined value at the speed lower than the base speed of the motor and the output power of the motor is limited within a predetermined value at the speed higher than the base speed of the motor, characterized in that the motor is driven by the pulse width modulation output having a simulated sine wave form at the speed lower than the base speed of the motor and by the pulse width modulaticn output having a rectangular wave form at the speed higher than the base speed of the motor.
Claim 2
Independent Claim
120 words
A system for driving an alternate current motor by a pulse width modulation inverter connected to a current source, in whicn the torque of the motor is limited within a predetermined value at the speed lower than the base speed of the motor and the output power of the motor is limited within a predetermined value at the speed higher than the base speed of the motor, characterized in that the motor is driven by the pulse width modulation output having a simulated sine wave form at the speed lower than the base speed of the motor and by the pulse width modulaticn output having a rectangular wave form at the speed higher than the base speed of the motor.
Claim 3
Dependent Claim
65 words
A system for driving an alternate current motor by a pulse width modulation inverter as defined in Claim 1, wherein the switching of the switching elements of the pulse width modulation inverter is effected by the signal produced from the comparator in which the comparison between a sine wave signal with the first frequency and a carrier wave signal with the second frequency is effected.
References Cited (Backward Citations)
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