Blower motor for HVAC systems
First Claim
1. A blower motor assembly comprising:
- a variable speed motor and motor controller;
a power input electrically coupled with the motor controller and comprising at least a first input for receiving AC power from an AC power source and first and second neutral inputs; and
a sensing circuit for sensing current in the first or second neutral inputs and for delivering a corresponding signal to the motor controller for selecting at least one operating parameter for the motor, the sensing circuit including a capacitor coupled to an input of the motor controller such that an electrical characteristic of the capacitor is related to the corresponding signal to the motor controller.
1 Assignment
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Accused Products
Abstract
A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor.
27 Citations
17 Claims
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1. A blower motor assembly comprising:
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a variable speed motor and motor controller; a power input electrically coupled with the motor controller and comprising at least a first input for receiving AC power from an AC power source and first and second neutral inputs; and a sensing circuit for sensing current in the first or second neutral inputs and for delivering a corresponding signal to the motor controller for selecting at least one operating parameter for the motor, the sensing circuit including a capacitor coupled to an input of the motor controller such that an electrical characteristic of the capacitor is related to the corresponding signal to the motor controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A blower motor assembly comprising:
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a variable speed motor and motor controller; a power input electrically coupled with the motor controller and comprising at least a first input for receiving AC power from an AC power source and first and second neutral inputs; and a sensing circuit for sensing which of at least one of the first and second neutral inputs power is applied to and for delivering a corresponding signal to the motor controller for selecting at least one operating parameter for the motor, the sensing circuit including a current transformer for sensing current in the first or second neutral inputs, a single transistor coupled with the current transformer for amplifying an output of the current transformer, and a capacitor coupled to an input of the motor controller for providing the corresponding signal to the motor controller. - View Dependent Claims (14, 15, 16, 17)
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Specification