VARIABLE SPEED DRIVE FOR PERMANENT MAGNET MOTOR
First Claim
1. A drive system for a compressor of a chiller system, the drive system comprising:
- a variable speed drive, the variable speed drive being configured to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency, the variable speed drive comprising;
a converter connected to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage;
a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter; and
at least one inverter connected to the DC link;
a motor connectable to the compressor for powering the compressor; and
an active filter connected in parallel with the motor, the active filter configured to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive, the high frequency currents generated by active filter substantially cancelling high frequency currents flowing into the motor.
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Accused Products
Abstract
A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link filters and stores the DC voltage from the converter. An inverter is connected to the DC link. A motor connectable to the compressor for powering the compressor. An active filter connected in parallel with the motor. The active filter is arranged to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive. The high frequency currents generated by active filter substantially cancel out high frequency currents flowing into the motor.
56 Citations
19 Claims
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1. A drive system for a compressor of a chiller system, the drive system comprising:
a variable speed drive, the variable speed drive being configured to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency, the variable speed drive comprising; a converter connected to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter; and at least one inverter connected to the DC link; a motor connectable to the compressor for powering the compressor; and an active filter connected in parallel with the motor, the active filter configured to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive, the high frequency currents generated by active filter substantially cancelling high frequency currents flowing into the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A drive system for a compressor of a chiller system, the drive system comprising:
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a variable speed drive, the variable speed drive being configured to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency, the variable speed drive comprising; a converter connected to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter; and at least one inverter connected to the DC link; a motor connectable to the compressor for powering the compressor; and an active filter connected in parallel with the motor, the active filter configured to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive to cancel a portion of high frequency currents generated in the output AC power; a passive filter connected between the variable speed drive and the motor, the passive filter configured to absorb at least a portion of the high frequency currents generated remaining in the output AC power following cancellation by the active filter. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification