Remotely-programmable control circuit for single-phase motor

摘要

An HVAC control system, associated brushless direct current motor, and methods of operation are disclosed. One such control system includes a brushless direct current motor and an optically-isolated interface exposing control access to the brushless direct current motor. The system includes a first programmable controller electrically connected to the brushless direct current motor, the programmable controller configured to receive a control signal via the optically-isolated interface, and a second programmable controller providing the control signal to the optically-isolated interface.

主权项

1. An HVAC control system comprising:
a brushless direct current motor; an optically-isolated interface exposing control access to the brushless direct current motor; a first programmable controller electrically connected to the brushless direct current motor, the programmable controller configured to receive a control signal via the optically-isolated interface; a second programmable controller providing the control signal to the optically-isolated interface; and a potentiometer electrically connected to the first programmable controller and useable to set a maximum operating condition of the brushless direct current motor; wherein the maximum operating condition set using the potentiometer defines the second maximum operating condition of the brushless direct current motor used in the event of a lack of power to the optically isolated interface; wherein the first programmable controller is further configured to operate at a level dependent upon a position of the potentiometer if no signal is present at the optically-isolated interface; and wherein the potentiometer is integrated with a housing of the brushless direct current motor.