Sensor calibration and parameter identification in a multi-phase motor drive
First Claim
1. A method for checking a multi-phase-motor-drive, comprising the steps of:
- (a) adjusting inverter switches of the motor-drive to produce a series loop that includes a bus capacitor, two of the switches, first and second phase motor windings, and first and second current sensors;
(b) discharging the capacitor through the loop;
(c) checking accuracy of the sensors by comparing current in the first and second current sensors.
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Abstract
In a multi-phase motor drive that includes a bus capacitor, a multi-phase motor, a multi-phase inverter, multiple switches each having an on-state and an off-state, and multiple current sensors each being in series with respective phase winding, a method for checking the accuracy of circuit parameters of the motor drive, including using the switches to produce a first loop that includes the capacitor bank, a first phase winding, a first current sensor, a second phase winding, and a second current sensor, using the current sensors to determine a magnitude of current in the first and second phase windings, comparing a magnitude of current indicated by the first current sensor and the second current sensor, and determining a magnitude of a difference between the current in the first and second phase windings.
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Citations
21 Claims
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1. A method for checking a multi-phase-motor-drive, comprising the steps of:
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(a) adjusting inverter switches of the motor-drive to produce a series loop that includes a bus capacitor, two of the switches, first and second phase motor windings, and first and second current sensors; (b) discharging the capacitor through the loop; (c) checking accuracy of the sensors by comparing current in the first and second current sensors. - View Dependent Claims (2, 3, 4)
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5. In a motor drive that includes a bus capacitor, a first multi-phase motor, a first multi-phase inverter connecting the bus capacitor with the first motor, a second multi-phase motor, a second multi-phase inverter in parallel with the first inverter and connecting the bus capacitor with each phase winding of the second motor, multiple switches, each switch having an on-state and an off-state and being in series with a phase winding, and multiple current sensors, each current sensor being in series with respective phase winding, a method, comprising the steps of:
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exhausting energy in the bus capacitor; allowing current to circulate through phase windings of the first motor and phase windings of the second motor; increasing a magnitude of voltage across the bus capacitor; monitoring the rate of change of voltage across the bus capacitor; checking accuracy of the sensors by comparing current in the current sensors when the rate of change of voltage across the bus capacitor becomes zero. - View Dependent Claims (6, 7, 8)
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9. In a multi-phase motor drive that includes a capacitor bank, a multi-phase motor, a multi-phase inverter connecting the bus capacitor with each phase winding of the motor, including multiple inverter switches, each inverter switch having an on-state and an off-state and being in series with a phase winding, and multiple inverter current sensors, each inverter current sensor being in series with a respective phase winding, and a boost DC/DC converter connected across the bus capacitor and including a converter inductor, a converter capacitor, multiple converter switches, and a converter current sensor located in a current path between the converter inductor and the converter capacitor, a method comprising the steps of:
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exhausting energy in the bus capacitor and the converter capacitor; recharging the bus capacitor by conducting motor inductive energy to said capacitor; producing free resonance between the converter inductor and the converter capacitor by drawing current from the bus capacitor; checking accuracy of the converter current sensor and inverter current sensors by comparing current in each current sensors when the net current to the bus capacitor is substantially zero. - View Dependent Claims (10, 11, 12)
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13. A method for checking a multi-phase-motor-drive, comprising:
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charging the bus capacitor and a capacitor of a DC/DC converter to a first voltage; calculating inductance of a DC/DC converter inductor while charging the bus capacitor to a predetermined voltage through two of the motor windings and an inverter connected to the windings and said capacitor; replacing said inductor if a nominal inductance of said inductor is substantially different than the calculated inductance. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method for checking of a multi-phase-motor-drive, comprising:
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charging a bus capacitor connected between an inverter and motor windings; producing current oscillation between said capacitor and two of the motor windings; calculating capacitance of the said capacitor use a measured voltage across said capacitor and current through the windings; replacing said capacitor if a nominal capacitance of said capacitor is different from the calculated capacitance.
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Specification