HVAC HYBRID BLOWER MOTOR SOFT START
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United States of America Patent
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Issued Date -
May 14, 2020
app pub date -
Nov 14, 2018
filing date -
Nov 14, 2018
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Abstract
A method for soft start of a motor in a heating, ventilation, and cooling (HVAC) system. The method includes operably connecting a first switching device with the motor; the first switching device operably connected to a power source and configured to direct power from a DC power source to the motor, and operably connecting a second switching device with the motor, the second switching device operably connected to a power source and configured to direct power from the DC power source to the motor. The method also includes receiving, by a controller, a request to engage the motor associated with an operation of the HVAC system, commanding the first switching device with a first pulse width modulation signal for a first selected duration, while ensuring the second switching device is disengaged, and after the first selected duration, enabling the second switching device and disengaging the first switching device.
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