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US 7,202,622 B2Granted
Method for controlling an electric motor to reduce EMI
AssigneeInternational Rectifier Corporation
InventorsJames B Eskritt, Joel E Kuehner
Life of this patent
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Abstract
A method for reducing EMI emissions in the control of an electric motor supplied by a switching inverter fed by a DC bus comprising controlling a phase advance of a conduction angle period during which a phase of the motor is fed power by the inverter to control the conduction angle to control the speed of the motor, thereby to reduce the number of switching operations of the inverter and thereby reduce EMI.
Claims17
A method for reducing EMI emissions in the control of an electric motor supplied by a switching inverter fed by a DC bus comprising:
- controlling a phase advance of a conduction angle period during which a phase of the motor is fed power by the inverter to control the conduction angle wherein controlling the phase advance of the conduction angle period further comprises adjusting the conduction angle by a phase angle to control speed of the motor;
- and thereby reducing the number of switching operations of the inverter such that EMI is reduced;
- said step of controlling comprising:
- providing a signal to the inverter that determines a switching instant for a switch of the inverter controlling the conduction angle;
- and
- advancing a switching-on time of a switch of the inverter coupling the DC bus voltage to a motor phase by the phase angle prior to the next signal determining the next switching instant to provide said phase advance.
3 more elements
Dependencies are inferred from the claim text.