Motor compressor control

Claim 2

In a refrigeration unit including a motor compressor unit enclosed within a shell, said motor including a start winding, the improvement comprising: a temperature responsive resistance element connected in series with the start winding of the motor, the resistance of said responsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough, said responsive element being disposed within the shell enclosing said motor compressor unit, refrigerant gas contained within said shell passing in heat transfer relation with said responsive element, the refrigerant gas removing heat from said responsive element when the flow of current thereto is interrupted due to the deenergization of the motor whereby the responsive element is rapidly cooled to place the element in a state to permit the flow of current therethrough to said start winding when the motor is reenergized.

Claim 3

In an air conditioning system operable to supply conditioned air to an area including a refrigeration unit comprising a compressor, a condensor, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and start winding connected in parallel, said motor and compressor being enclosed within a shell, the improvement comprising: a supply circuit for providing electrical energy to said compressor motor including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; a temperature responsive resistance element connected in series with said start winding of said compressor motor, the resistance of said responsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough, said responsive element being disposed within the shell enclosing said motor compressor unit whereby refrigerant gas contained within said shell passes in heat transfer relation with said responsive element; and capacitor means connected in series with said start winding and in parallel with said temperature responsive element, current to the start winding during starting conditions flowing through both said capacitor means and said temperature responsive element in a predetermined relationship, current through said start winding passing through said capacitor means when the resistance of said element substantially eliminates the flow of current therethrough when normal operating conditions have been obtained, whereby the refrigerant gas removes heat from said temperature responsive element when the flow of current thereto is interrupted due to the deenergization of said compressor motor to thereby rapidly cool the resistance element to place the element in a state to permit the flow of current therethrough to said start winding when the motor is reenergized.

Claim 4

In an air conditioning system operable to supply conditioned air to an area including a refrigeration unit comprising a compressor, a condensor, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and start winding connected in parallel, said motor and compressor being enclosed within a shell, the improvement comprising: a supply circuit for providing electrical energy to said compressor motor including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; a temperature responsive resistance element connected in series with said start winding of said compressor motor, the resistance of said responsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough, said responsive element being disposed within the shell enclosing said motor compressor unit whereby refrigerant gas contained within said shell passes in heat transfer relation with said responsive element; and capacitor means connected in series with said start winding and in parallel with said temperature responsive element, current to the start winding during starting conditions flowing through both said capacitor means and said temperature responsive element in a predetermined relationship, current through said start winding passing through said capacitor means when the resistance of said element substantially eliminates the flow of current therethrough when normal operating conditions have been obtained, whereby the refrigerant gas removes heat from said temperature responsive element when the flow of current thereto is interrupted due to the deenergization of said compressor motor to thereby rapidly cool the resistance element to place the element in a state to permit the flow of current therethrough to said start winding when the motor is reenergized.

Claim 5

A combination in accordance with claim 1 wherein said temperature responsive resistance element is a positve temperature coefficient thermistor.

Claim 6

A combination in accordance with claim 1 wherein said motor includes capacitor means connected in series with said temperature responsive resistance element and with said start winding.

Claim 7

A combination in accordance with claim 1 wherein said motor includes capacitor means connected in parallel to said temperature responsive resistance element and in series with said start winding.

Claim 8

A combination in accordance with claim 2 wherein said temperature reponsive resistance element is a positive temperature coefficient thermistor.

Claim 9

In an air conditioning system operable to supply conditioned air to an area including a refrigeration unit comprising a compressor, a condenser, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and a start winding connected in parallel, said motor and said compressor being enclosed within a shell, the improvement comprising: a supply circuit for providing electrical energy to said compressor motor including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; and a temperature responsive resistance element connected in series with said start winding of the motor, the resistance of said reponsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough, said responsive element being disposed within the shell enclosing said motor compressor unit, refrigerant gas contained within said shell passing in heat transfer relation with said responsive element, the refrigerant gas removing heat from said responsive element when the flow of current thereto is interrupted due to the deenergization of the motor whereby the responsive element is rapidly cooled to place the element in a state to permit the flow of current therethrough to said start winding when the motor is reenergized.

Claim 10

In an air conditioning system operable to supply conditioned air to an area including a refrigeration unit comprising a compressor, a condenser, an evaporator and expansion means connected in a closed circuit, a motor for actuating said compressor, said motor having a main winding and a start winding connected in parallel, said motor and said compressor being enclosed within a shell, the improvement comprising: a supply circuit for providing electrical energy to said compressor motor including thermally responsive switch means operable to energize said supply circuit in response to temperature conditions in said area; and a temperature responsive resistance element connected in series with said start winding of the motor, the resistance of said reponsive element substantially increasing as a function of its temperature, the temperature thereof being increased by the flow of current therethrough, said responsive element being disposed within the shell enclosing said motor compressor unit, refrigerant gas contained within said shell passing in heat transfer relation with said responsive element, the refrigerant gas removing heat from said responsive element when the flow of current thereto is interrupted due to the deenergization of the motor whereby the responsive element is rapidly cooled to place the element in a state to permit the flow of current therethrough to said start winding when the motor is reenergized.

Claim 11

In the combination in accordance with claim 7, said motor further including capacitor means connected in series with said start winding and with said temperature responsive resistance element.