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US 7,312,593 B1Granted
Thermal regulation of AC drive
AssigneeRockwell Automation Technologies, Inc.
InventorsJohn T. Streicher, Steven J. Perreault, Jeffrey P. Rivard, David W. Siegler
Life of this patent
Estimating the term…
Abstract
An apparatus for the thermal regulation of an AC drive for providing power to a motor includes a temperature sensor producing a signal indicative of temperature, a heater resistor connectable across a DC link of the AC drive, and a first switch. A controller is operable to monitor the temperature signal and control the first switch to provide power via the DC link to the heater resistor if the sensed temperature is below a predetermined setpoint.
Claims6
An AC drive for providing power to a motor, comprising:
- an enclosure,
- a temperature sensor for measuring temperature within the enclosure,
- a heater resistor within the enclosure,
- a rectifier for rectifying AC power and producing DC power on a DC link,
- an inverter connected to the rectifier across the DC link and converting DC power to adjustable frequency power,
- a capacitor across the DC link,
- a switch in series with the resistor across the DC link, and
- a controller operable to monitor the temperature and voltage across the DC link and control the switch to provide power to the resistor if the motor is inactive and the sensed temperature is below a predetermined setpoint.
5 more elements
Dependencies are inferred from the claim text.