Motor drive with voltage-accurate inverter
First Claim
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1. In a motor drive providing a controller converting command signals to inverter-input signals received by an inverter to produce three-phase motor drive signals, an improvement comprising:
- a voltage feedback loop acquiring voltage feedback signals measuring the voltage of the three-phase motor drive signals and providing the voltage feedback signals to the controller to correct the inverter-input signals to adjust the voltage of the three-phase motor drive signals to conform with the inverter input signals;
wherein the controller includes control logic receiving the command signals to produce the inverter input signals as a vector described by a q-component and a d-component the vector received by a first transform means converting the vector to the three-phase sinusoidal signals wherein the voltage feedback loop includes a second transform means converting the voltage feedback signals to a feedback q-component and a feedback d-component and summers subtracting the feedback q-component from the q-component and subtracting the feedback d-component from the d-component, prior to the q-component and d-component being received by the first transform means.
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Abstract
Improved voltage stiffness in the output voltage of an inverter used for a motor drive is obtained by a minor voltage feedback loop connecting the output of the inverter to a three-phase input in a vector domain.
9 Citations
20 Claims
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1. In a motor drive providing a controller converting command signals to inverter-input signals received by an inverter to produce three-phase motor drive signals, an improvement comprising:
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a voltage feedback loop acquiring voltage feedback signals measuring the voltage of the three-phase motor drive signals and providing the voltage feedback signals to the controller to correct the inverter-input signals to adjust the voltage of the three-phase motor drive signals to conform with the inverter input signals;
wherein the controller includes control logic receiving the command signals to produce the inverter input signals as a vector described by a q-component and a d-component the vector received by a first transform means converting the vector to the three-phase sinusoidal signals wherein the voltage feedback loop includes a second transform means converting the voltage feedback signals to a feedback q-component and a feedback d-component and summers subtracting the feedback q-component from the q-component and subtracting the feedback d-component from the d-component, prior to the q-component and d-component being received by the first transform means. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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- 2. (cancelled).
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12. A method of controlling a motor using a motor drive having a controller converting command signals to inverter-input signals received by an inverter to produce three-phase motor drive signals, comprising the steps of:
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(a) measuring the voltage of the three-phase motor drive signals to produce voltage feedback signals; and
(b) providing the voltage feedback signals to the controller to correct the inverter-input signals to adjust the voltage of the three-phase motor drive signals to conform with the inverter input signals;
further including the steps of;
producing the inverter input signals as a vector described by a q-component and a d-component;
transforming the voltage feedback signals to a feedback q-component and a feedback d-component; and
subtracting the feedback q-component from the q-component and subtracting the feedback d-component from the d-component, prior to the q-component and d-component to correct the inverter input signals. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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13. (cancelled).
Specification