# US 2013/0278200 A1 · System for controlling controlled variable of rotary machine

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- Number: US 2013/0278200 A1
- Document ID: US20130278200A1
- Status: Published application
- Kind: A1
- Application number: 13/867,367
- Filed: 2013-04-22
- Published: 2013-10-24
- Earliest claimed: 2012-04-20
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Kiyoshi FUJII; Akimasa OSAKI; Hideki KABUNE; Koichi NAKAMURA
- Web page: https://patentgrep.com/patent/US20130278200A1

## CPC

- H02P 21/06: Rotor flux based control involving the use of rotor position or rotor speed sensors
- H02P 6/10: Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

In a system for controlling a controlled variable of a rotary machine having plural-phase input terminals of the rotary machine in which plural-phase AC power is applied from an AC power applying module to the input terminals, a command-voltage setting module sets, based on a request value for the controlled variable, plural-phase AC command voltages for the plural-phase AC power as a feedforward manipulated variable. A current obtaining module obtains plural-phase AC currents flowing in the respective plural-phase input terminals of the rotary machine. An amplitude correcting module corrects the amplitude of at least one of the plural-phase AC command voltages based on the magnitudes of the plural-phase AC currents.

## Claims

### Claim 1

A system for controlling a controlled variable of a rotary machine having plural-phase input terminals of the rotary machine in which plural-phase AC power is applied from an AC power applying module to the plural-phase input terminals, the system comprising:
a command-voltage setting module configured to set, based on a request value for the controlled variable, plural-phase AC command voltages for the plural-phase AC power as a feedforward manipulated variable;
a current obtaining module configured to obtain plural-phase AC currents flowing in the respective plural-phase input terminals of the rotary machine; and
an amplitude correcting module configured to correct an amplitude of at least one of the plural-phase AC command voltages based on magnitudes of the plural-phase AC currents obtained by the current obtaining module.

### Claim 2 (depends on 1)

The system according to claim 1, wherein the amplitude correcting module further comprises:
a command-current calculating module configured to calculate plural-phase AC command currents for the plural-phase input terminals of the rotary machine as a function of the request value of the controlled variable; and
a correction value calculating module configured to calculate a correction value that corrects the amplitude of the at least one of the plural-phase AC command voltages such that the magnitudes of the plural-phase AC currents match with those of the respective plural-phase AC command currents.

### Claim 3 (depends on 2)

The system according to claim 2, wherein the correction value calculating module further comprises:
a manipulated-variable calculating module configured to calculate a manipulated variable for the at least one of the plural-phase AC command voltages as a function of a deviation between a magnitude of each of the plural-phase AC currents and a magnitude of a corresponding one of the plural-phase AC command currents; and
an adding module configured to add 1 to the manipulated variable for the at least one of the plural-phase AC command voltages,
the amplitude correcting module further comprising:
a multiplying module configured to multiply the at least one of the plural-phase AC command voltages by a result of the addition by the adding module to thereby correct the amplitude of the at least one of the plural-phase AC command voltages.

### Claim 4 (depends on 3)

The system according to claim 3, wherein correction value calculating module further comprises:
an absolute value calculating module configured to calculate an absolute value of each of the plural-phase AC currents as the magnitude thereof; and
a deviation calculating module configured to calculate the deviation between the absolute value of each of the plural-phase AC currents and an absolute value of a corresponding one of the plural-phase AC command currents as the magnitude thereof,
wherein the deviation between the absolute value of each of the plural-phase AC currents and that of a corresponding one of the plural-phase AC command currents is input to the manipulated-variable calculating module.

### Claim 5 (depends on 2)

The system according to claim 2, further comprising:
a zero-cross timing detector configured to detect a zero-cross timing when each of the plural-phase AC currents crosses through zero; and
a phase manipulating module configured to manipulate a phase of one or more of the plural-phase AC command voltages to thereby adjust a deviation between the detected zero-cross timing of each of the plural-phase AC currents and a zero-cross timing of a corresponding one of the plural-phase AC command currents to a target value.

### Claim 6 (depends on 5)

The system according to claim 5, wherein:
the AC power applying module is designed as an inverter, the inverter comprising a switching element provided for each of the plural-phase input terminals, the switching element having a conductive path between a first end and a second end thereof, the inverter being configured to convert DV power to the AC power by turning on or off each of the switching elements, and
the zero-cross timing detector is configured to:
obtain a polarity of a potential difference between the first and second ends of the conductive terminal of each of the switching elements to thereby determine whether a corresponding one of the plural-phase AC currents crosses through zero.

### Claim 7 (depends on 5)

The system according to claim 5, wherein an absolute value of the target value is set to increase with an increase in a rotational speed of the rotary machine.

### Claim 8 (depends on 1)

The system according to claim 1, wherein the AC power applying module is configured as an inverter, the inverter comprising a pair of first and second switching elements provided for each of the plural-phase input terminals, each of the first and second switching elements having a conductive path between a first end and a second end thereof, the inverter being configured to convert DV power to the AC power by alternatively turn on the first and second switching elements while an on duration of the first switching element is delayed by a dead time during which both the first and second switching elements are off, the system further comprising:
a polarity detecting module configured to detect a polarity of a potential difference between the first and second ends of the conductive terminal of each of the first switching elements; and
a compensating module configured to correct, based on the detected polarity of the potential difference between the first and second ends of the conductive tee terminal of each of the first switching elements, a corresponding one of the plural-phase AC command voltages to compensate for the dead time of a corresponding one of the first switching elements.

### Claim 9 (depends on 1)

The system according to claim 1, wherein the AC power applying module is designed as an inverter, the inverter comprising a pair of first and second switching elements provided for each of the plural-phase input terminals, the inverter being configured to convert DV power to the AC power by alternately turning on and off the first and second switching elements for each of the plural-phase input terminals, and wherein:
the amplitude correcting module further comprises:
a specifying module configured to specify which phase AC current in the plural-phase AC currents is obtained by the current obtaining module based on information representing one of on-off modes of the first and second switching elements provided for each of the plural-phase input terminals.