Motor driving control device
First Claim
1. A motor driving control device that performs driving control of a motor, whereinlet an axis parallel to a magnetic flux produced by a permanent magnet forming a rotor of the motor be called a d axis, andlet an axis estimated, for a purpose of control, to correspond to the d axis be called a γ
- axis,then the motor driving control device comprises;
a voltage feeder that applies an alternating voltage or a rotation voltage having a predetermined frequency to the motor as a detection voltage;
an extractor that extracts, from a γ
-axis component of a motor current that flows through the motor, a partly-extracted γ
-axis current obtained by attenuating at least a direct-current component of the γ
-axis component; and
a detector that detects a polarity of a magnetic pole of the rotor by a use of the partly-extracted γ
-axis current.
1 Assignment
0 Petitions
Accused Products
Abstract
In a motor driving control device, a high-frequency alternating voltage or rotation voltage (having a frequency of ωh) is applied to a motor so that magnetic saturation occurs in the motor, thereby extracting, from a γ-axis current, a high-frequency second-harmonic component (a frequency component of 2×ωh) that is obtained by attenuating at least a direct-current component of the γ-axis current. The polarity checker detects the polarity of the magnetic pole of the rotor based on the difference, caused by magnetic saturation, between the positive and negative amplitudes of the high-frequency second-harmonic component.
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Citations
20 Claims
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1. A motor driving control device that performs driving control of a motor, wherein
let an axis parallel to a magnetic flux produced by a permanent magnet forming a rotor of the motor be called a d axis, and let an axis estimated, for a purpose of control, to correspond to the d axis be called a γ - axis,
then the motor driving control device comprises; a voltage feeder that applies an alternating voltage or a rotation voltage having a predetermined frequency to the motor as a detection voltage; an extractor that extracts, from a γ
-axis component of a motor current that flows through the motor, a partly-extracted γ
-axis current obtained by attenuating at least a direct-current component of the γ
-axis component; anda detector that detects a polarity of a magnetic pole of the rotor by a use of the partly-extracted γ
-axis current. - View Dependent Claims (2, 3, 4, 5, 6)
- axis,
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7. A motor driving control device that performs driving control of a motor, wherein
let arbitrary two axes that are at right angles to one another be called an x axis and a y axis, then the motor driving control device comprises: -
a voltage feeder that applies a rotation voltage having a predetermined frequency to the motor as a detection voltage; an extractor that extracts, from an x-axis component of a motor current that flows through the motor, a partly-extracted x-axis current obtained by attenuating at least a direct-current component of the x-axis component, and that extracts, from a y-axis component of the motor current, a partly-extracted y-axis current obtained by attenuating at least a direct-current component of the y-axis component; and a detector that performs at least one of detection of a polarity of a magnetic pole of a rotor of the motor and detection of a magnetic-pole position within a range of ±
π
/2 by a use of the partly-extracted x-axis current and the partly-extracted y-axis current. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A motor driving control device that performs driving control of a motor, wherein
let an axis parallel to a magnetic flux produced by a permanent magnet forming a rotor of the motor be called a d axis, and let an axis estimated, for a purpose of control, to correspond to the d axis be called a γ - axis,
then the motor driving control device comprises; a voltage feeder that applies to the motor a voltage to pass therethrough an alternating current or a rotation current having a predetermined frequency as a detection current; an extractor that extracts, from a γ
-axis component of the voltage applied by the voltage feeder, a partly-extracted γ
-axis voltage obtained by attenuating at least a direct-current component of the γ
-axis component; anda detector that detects a polarity of a magnetic pole of the rotor by a use of the partly-extracted γ
-axis voltage. - View Dependent Claims (14, 15)
- axis,
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16. A motor driving control device that performs driving control of a motor, wherein
let arbitrary two axes that are at right angles to one another be called an x axis and a y axis, then the motor driving control device comprises: -
a voltage feeder that applies to the motor a voltage to pass therethrough a rotation current having a predetermined frequency as a detection current; an extractor that extracts, from an x-axis component of the voltage applied by the voltage feeder, a partly-extracted x-axis voltage obtained by attenuating at least a direct-current component of the x-axis component, and that extracts, from a y-axis component of the voltage, a partly-extracted y-axis voltage obtained by attenuating at least a direct-current component of the y-axis component; and a detector that performs at least one of detection of a polarity of a magnetic pole of a rotor of the motor and detection of a magnetic-pole position within a range of ±
π
/2 by a use of the partly-extracted x-axis voltage and the partly-extracted y-axis voltage. - View Dependent Claims (17, 18, 19, 20)
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Specification