Vibration protection in a variable speed compressor
First Claim
1. A system comprising:
- a variable speed compressor operable at a plurality of frequencies; and
a control module that controls an operating frequency of the variable speed compressor, the control module storing at least one prohibited frequency range that includes a resonant frequency of the variable speed compressor and storing an allowed upper frequency and an allowed lower frequency for each prohibited frequency range of the at least one prohibited frequency range, the allowed upper frequency being above the associated prohibited frequency range and the allowed lower frequency being below the associated prohibited frequency range;
wherein the control module determines a requested frequency for operating the variable speed compressor, compares the requested frequency with the at least one prohibited frequency range, operates the variable speed compressor at the requested frequency when the requested frequency is outside of the at least one prohibited frequency range, determines an upper frequency operating time and a lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and operates the variable speed compressor at the allowed upper frequency for the upper frequency operating time and at the allowed lower frequency for the lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and wherein the control module determines the upper frequency operating time and the lower frequency operating time such that a time-averaged frequency output over the upper frequency operating time and the lower frequency operating time corresponds to the requested frequency.
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Accused Products
Abstract
A system and method are provided for a variable speed compressor with a control module that controls an operating frequency of the variable speed compressor. The control module stores a prohibited frequency range that includes a resonant frequency of the variable speed compressor and an allowed upper frequency above the prohibited frequency range and an allowed lower frequency below the prohibited frequency range. The control module determines a requested frequency and operates the variable speed compressor at the allowed upper frequency for an upper frequency operating time and at the allowed lower frequency for a lower frequency operating time when the requested frequency is within the prohibited frequency range. The control module determines the upper frequency operating time and the lower frequency operating time such that a time-averaged frequency output over the upper frequency operating time and the lower frequency operating time corresponds to the requested frequency.
293 Citations
18 Claims
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1. A system comprising:
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a variable speed compressor operable at a plurality of frequencies; and a control module that controls an operating frequency of the variable speed compressor, the control module storing at least one prohibited frequency range that includes a resonant frequency of the variable speed compressor and storing an allowed upper frequency and an allowed lower frequency for each prohibited frequency range of the at least one prohibited frequency range, the allowed upper frequency being above the associated prohibited frequency range and the allowed lower frequency being below the associated prohibited frequency range; wherein the control module determines a requested frequency for operating the variable speed compressor, compares the requested frequency with the at least one prohibited frequency range, operates the variable speed compressor at the requested frequency when the requested frequency is outside of the at least one prohibited frequency range, determines an upper frequency operating time and a lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and operates the variable speed compressor at the allowed upper frequency for the upper frequency operating time and at the allowed lower frequency for the lower frequency operating time when the requested frequency is within the at least one prohibited frequency range, and wherein the control module determines the upper frequency operating time and the lower frequency operating time such that a time-averaged frequency output over the upper frequency operating time and the lower frequency operating time corresponds to the requested frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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storing, with a control module that controls an operating frequency of a variable speed compressor operable at a plurality of frequencies, at least one prohibited frequency range that includes a resonant frequency of the variable speed compressor; storing, with the control module, an allowed upper frequency and an allowed lower frequency for each prohibited frequency range of the at least one prohibited frequency range, the allowed upper frequency being above the associated prohibited frequency range and the allowed lower frequency being below the associated prohibited frequency range; determining, with the control module, a requested frequency for operating the variable speed compressor; comparing, with the control module, the requested frequency with the at least one prohibited frequency range; operating, with the control module, the variable speed compressor at the requested frequency when the requested frequency is outside of the at least one prohibited frequency range; determining, with the control module, an upper frequency operating time and a lower frequency operating time when the requested frequency is within the at least one prohibited frequency range; and operating, with the control module, the variable speed compressor at the allowed upper frequency for the upper frequency operating time and at the allowed lower frequency for the lower frequency operating time when the requested frequency is within the at least one prohibited frequency range; wherein the upper frequency operating time and the lower frequency operating time are determined such that a time-averaged frequency output over the upper frequency operating time and the lower frequency operating time corresponds to the requested frequency. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification