US6555988B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor control device
Assignee: Hitachi Ltd
•
Filing: 2000-12-01
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Granted: 2003-04-29
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Expires: 2020-12-01
Abstract
Abstract In an arrangement having an electric power inverter 2 which applies a voltage to an AC motor 1 and a control unit 4 which calculates a voltage command value applied in PWM signals, detection use voltages Vup, Vvp and Vwp are applied in synchronism with PWM signal generation use carrier waves in the control unit 4 as well as motor currents iv and iv are detected in response to current detection pulses Pd in synchronism therewith. In a magnetic pole position detection unit 12, counter electromotive forces of the synchronous motor 1 are estimated from a relationship between the detection use voltages Vup, Vvp and Vwp and current difference vectors of the motor current to determine a magnetic pole position theta through calculation. The determined magnetic pole position theta is inputted to coordinate conversion units 8 and 11 and a motor speed detection unit 13. Thereby, a motor control device having a control characteristic of a good response property with no magnetic pole position sensor is provided for a control system of a synchronous motor.
Inventors
- 👤 Ryoso Masaki
- 👤 Satoru Kaneko
- 👤 Sanshiro Obara
- 👤 Mitsuyuki Hombu
- 👤 Yoshimi Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:48
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02P6/16; H02P6/18; H02P6/182; H02P25/00; H02P25/02; H02P25/08; H02P25/086; H02P25/089
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
94 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; the phases of the applied voltages which are modified are varied depending on operating states of the AC motor.
Claim 2
Independent Claim
94 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; the phases of the applied voltages which are modified are varied depending on operating states of the AC motor.
Claim 3
Independent Claim
79 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor through shifting the PWM signals within one cycle of the carrier waves from current variation amount of the AC motor.
Claim 4
Independent Claim
79 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor through shifting the PWM signals within one cycle of the carrier waves from current variation amount of the AC motor.
Claim 5
Independent Claim
103 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a current variation amount detection unit which detects current variation amount of the AC motor for every predetermined time in synchronism with the carrier waves and a position estimation unit which estimates a rotor position of the AC motor from a relationship between a plurality of the current variation amounts and a plurality of the applied voltages corresponding thereto.
Claim 6
Independent Claim
103 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a current variation amount detection unit which detects current variation amount of the AC motor for every predetermined time in synchronism with the carrier waves and a position estimation unit which estimates a rotor position of the AC motor from a relationship between a plurality of the current variation amounts and a plurality of the applied voltages corresponding thereto.
Claim 7
Independent Claim
116 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWIVL signals in synchronism with carrier waves; wherein the motor control device further comprises a voltage addition unit which adds a detection use voltage in a direction of estimated magnetic pole position (d-axis) in synchronism with the carrier waves, a current variation amount detection unit which detects current variation amount of the AC Motor for every predetermined time in synchronism with the carrier waves and a position estimation unit which estimates a rotor position of the AC motor from a plurality of the current variation amounts.
Claim 8
Independent Claim
116 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWIVL signals in synchronism with carrier waves; wherein the motor control device further comprises a voltage addition unit which adds a detection use voltage in a direction of estimated magnetic pole position (d-axis) in synchronism with the carrier waves, a current variation amount detection unit which detects current variation amount of the AC Motor for every predetermined time in synchronism with the carrier waves and a position estimation unit which estimates a rotor position of the AC motor from a plurality of the current variation amounts.
Claim 9
Independent Claim
84 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by applying applied voltages having different phases in vector, a plurality of times, and by detecting counter electromotive forces from current variation amounts of the AC motor for respective voltage applications.
Claim 10
Independent Claim
84 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by applying applied voltages having different phases in vector, a plurality of times, and by detecting counter electromotive forces from current variation amounts of the AC motor for respective voltage applications.
Claim 11
Independent Claim
90 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by applying applied voltages having the same phase in vector and different magnitude, a plurality of times, and by detecting counter electromotive forces from the current variation amounts of the AC motor for the respective voltage applications.
Claim 12
Independent Claim
90 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by applying applied voltages having the same phase in vector and different magnitude, a plurality of times, and by detecting counter electromotive forces from the current variation amounts of the AC motor for the respective voltage applications.
Claim 13
Independent Claim
84 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by controlling phases of applied voltages so that a phase difference of the current variation amounts of the AC motor with respect to the applied voltages assumes either 0° or 180°.
Claim 14
Independent Claim
84 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by controlling phases of applied voltages so that a phase difference of the current variation amounts of the AC motor with respect to the applied voltages assumes either 0° or 180°.
Claim 15
Independent Claim
75 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by controlling applied voltages so that the current variation amounts of the AC motor with respect to the applied voltages assumes 0.
Claim 16
Independent Claim
75 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor by controlling applied voltages so that the current variation amounts of the AC motor with respect to the applied voltages assumes 0.
Claim 17
Independent Claim
65 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a current variation control unit which controls the voltage so that current variation amounts of the AC motor assumes a value of 0 in a predetermined section.
Claim 18
Independent Claim
65 words
A device for controlling an AC motor, comprising: an electric power inverter which applies voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a current variation control unit which controls the voltage so that current variation amounts of the AC motor assumes a value of 0 in a predetermined section.
Claim 19
Dependent Claim
24 words
The device according to claim 9 , wherein the current variation control unit either detects or compensates counter electromotive forces of the AC motor.
Claim 20
Independent Claim
54 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a phase shifting means which shifts the PWM signals within one cycle of carrier waves.
Claim 21
Independent Claim
54 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals; wherein the motor control device further comprises a phase shifting means which shifts the PWM signals within one cycle of carrier waves.
Claim 22
Independent Claim
94 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; and the PWM signals are shifted so that a section for detecting current assumes a 0 voltage vector state.
Claim 23
Independent Claim
94 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; and the PWM signals are shifted so that a section for detecting current assumes a 0 voltage vector state.
Claim 24
Independent Claim
105 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; and the rotor position is detected by controlling applied voltages so that a phase of a current variation amount difference vector coincides with a difference vector of the applied voltage.
Claim 25
Independent Claim
105 words
A device for controlling an AC motor, comprising: an electric power inverter which applies a voltage to the AC motor; and a control unit which controls the applied voltage with PWM signals in synchronism with carrier waves; wherein the motor control device further comprises a position estimation unit which estimates a position of a rotor of the AC motor based on a detection of current in the AC motor in synchronism with the carrier waves; and the rotor position is detected by controlling applied voltages so that a phase of a current variation amount difference vector coincides with a difference vector of the applied voltage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-04-28 | 2006-10-28 | 2007-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-04-28 | 2010-10-28 | 2011-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-04-28 | 2014-10-28 | 2015-04-29 | $7700.00 | Window Closed / Lapsed |