Variable frequency motor starting system and method
First Claim
1. A variable frequency motor starting system comprising:
- a variable frequency AC power supply for generating an AC power output signal having a variable frequency, including a power output terminal adapted for applying the AC power output signal to an AC motor; and
a controller coupled to the variable frequency AC power supply for producing a control signal for adjusting the frequency of the variable frequency AC power supply, wherein the controller adjusts the frequency from a first value to a second value, the second value being below the first value and then adjusts the frequency by increasing the frequency from the second value to a final value.
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Accused Products
Abstract
A variable frequency motor starting system has a variable frequency AC power supply for generating an AC power output signal applied to an AC motor. A controller is coupled to the variable frequency AC power supply for producing a control signal for adjusting the frequency of the AC power output signal produced. Upon initially applying power to an AC motor or detection of a starting current for an AC motor, the controller adjusts the frequency of the power output signal applied to the AC motor. The frequency of the power output signal is adjusted to a value below the value of the typical operating frequency. The value of the frequency can be increased to the final operating value.
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Citations
37 Claims
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1. A variable frequency motor starting system comprising:
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a variable frequency AC power supply for generating an AC power output signal having a variable frequency, including a power output terminal adapted for applying the AC power output signal to an AC motor; and a controller coupled to the variable frequency AC power supply for producing a control signal for adjusting the frequency of the variable frequency AC power supply, wherein the controller adjusts the frequency from a first value to a second value, the second value being below the first value and then adjusts the frequency by increasing the frequency from the second value to a final value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21)
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19. A method of starting an AC motor comprising:
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applying a varying voltage to an AC motor; adjusting a nominal frequency of the applied varying voltage from a first value to a second value, wherein the second value is below the typical operating frequency of the applied voltage; and selectively increasing the value of the frequency of the applied varying voltage from the second value to a final value. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A variable frequency motor starting system comprising:
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a variable frequency power supply for generating a variable power output signal having a variable frequency, including a power output terminal adapted for applying the power output signal to a motor; and a controller coupled to the variable frequency power supply for producing a control signal for adjusting the frequency of the variable frequency power supply, wherein the controller adjusts the frequency from a first value to a second value, in response to the control signal, the second value being less than the first value, and then adjusts the frequency by increasing the frequency from the second value to a final value. - View Dependent Claims (29, 30, 31, 32)
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33. A method of starting a motor comprising:
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applying a varying voltage to a selected motor; adjusting a nominal frequency of the applied varying voltage from a first value to a second value, wherein the second value is less than the first value; and selectively increasing the value of the frequency of the applied varying voltage from the second value to a final value in response to motor performance. - View Dependent Claims (34, 35, 36, 37)
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Specification