Variable speed compressor protection system and method
First Claim
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1. A system comprising:
- a compressor connected to an evaporator;
a suction temperature sensor that outputs a suction temperature signal corresponding to a temperature of refrigerant entering said compressor;
an inverter drive connected to said compressor that receives electric power and modulates a speed of said compressor by modulating a frequency of said electric power;
a heat sink temperature sensor that outputs a heat sink temperature signal corresponding to a temperature of a heat sink associated with said inverter;
a control module connected to said inverter drive that receives said suction temperature signal, that monitors compressor power data and compressor speed data from said inverter drive, that calculates a saturated evaporator temperature of a refrigeration system associated with said compressor and said evaporator based on said suction temperature signal, said heat sink temperature signal, said compressor power data, and said compressor speed data; and
that generates at least one of a control signal and a notification signal based on said calculated saturated evaporator temperature.
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Abstract
A system and method for a compressor may include an inverter drive connected to the compressor that receives electric power and modulates a speed of the compressor by modulating a frequency of the electric power. A control module connected to the inverter drive monitors compressor power data and compressor speed data from the inverter drive, and calculates a saturated condenser temperature of a refrigeration system associated with the compressor based on the compressor power data and the compressor speed data.
260 Citations
16 Claims
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1. A system comprising:
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a compressor connected to an evaporator; a suction temperature sensor that outputs a suction temperature signal corresponding to a temperature of refrigerant entering said compressor; an inverter drive connected to said compressor that receives electric power and modulates a speed of said compressor by modulating a frequency of said electric power; a heat sink temperature sensor that outputs a heat sink temperature signal corresponding to a temperature of a heat sink associated with said inverter; a control module connected to said inverter drive that receives said suction temperature signal, that monitors compressor power data and compressor speed data from said inverter drive, that calculates a saturated evaporator temperature of a refrigeration system associated with said compressor and said evaporator based on said suction temperature signal, said heat sink temperature signal, said compressor power data, and said compressor speed data; and
that generates at least one of a control signal and a notification signal based on said calculated saturated evaporator temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising
receiving a suction temperature signal from a suction temperature sensor, said suction temperature signal corresponding to a temperature of refrigerant entering a compressor, said compressor being connected to an evaporator; -
delivering electric power to said compressor with an inverter drive configured to modulate a speed of said compressor by modulating a frequency of said electric power; receiving a heat sink temperature signal from a heat sink temperature sensor, said heat sink temperature signal corresponding to a temperature of a heat sink associated with said inverter; monitoring compressor power data and compressor speed data from said inverter drive; calculating a saturated evaporator temperature of a refrigeration system associated with said compressor and said evaporator based on said suction temperature signal, said heat sink temperature signal, said compressor power data, and said compressor speed data; generating at least one of a control signal and a notification signal based on said calculated saturated evaporator temperature. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification