APPARATUS AND METHOD FOR DIAGNOSING PERMANENT MAGNET DEMAGNETIZATION OF PERMANENT MAGNET SYNCHRONOUS MOTOR, AND APPARATUS FOR DRIVING PERMANENT MAGNET SYNCHRONOUS MOTOR
First Claim
1. An apparatus for diagnosing a permanent magnet demagnetization of a permanent magnet synchronous motor, the apparatus comprising:
- a magnetic field generating unit generating magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is at standstill;
a stator current measuring unit measuring values of currents which flow in a stator winding in correspondence with the respective generated magnetic fields; and
a demagnetization diagnosing unit comparing a predetermined reference value and a comparison value to diagnose demagnetization of a permanent magnet attached to the rotor, the comparison value being calculated on the basis of the magnitudes of the stator winding currents measured in correspondence with the respective generated magnetic fields.
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Accused Products
Abstract
Provided are an apparatus and a method for diagnosing permanent magnet demagnetization of a permanent magnet synchronous motor. The apparatus includes a magnetic field generating unit, a stator current measuring unit, and a demagnetization diagnosing unit. The magnetic field generating unit generates magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is in a standstill. The stator current measuring unit measures currents which flow in a stator winding in correspondence with the respective generated magnetic fields. The demagnetization diagnosing unit compares a predetermined reference value and a comparison value which is calculated on the basis of the magnitudes of the stator winding currents which are measured in correspondence with the respective generated magnetic fields to diagnose demagnetization of a permanent magnet attached to the rotor.
23 Citations
20 Claims
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1. An apparatus for diagnosing a permanent magnet demagnetization of a permanent magnet synchronous motor, the apparatus comprising:
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a magnetic field generating unit generating magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is at standstill; a stator current measuring unit measuring values of currents which flow in a stator winding in correspondence with the respective generated magnetic fields; and a demagnetization diagnosing unit comparing a predetermined reference value and a comparison value to diagnose demagnetization of a permanent magnet attached to the rotor, the comparison value being calculated on the basis of the magnitudes of the stator winding currents measured in correspondence with the respective generated magnetic fields. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for diagnosing a permanent magnet demagnetization of a permanent magnet synchronous motor, the method comprising:
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generating magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is at standstill; measuring currents which flow in a stator winding in correspondence with the respective generated magnetic fields; and comparing a predetermined reference value and a comparison value to diagnose demagnetization of a permanent magnet attached to the rotor, the comparison value being calculated on the basis of the magnitudes of the stator winding currents measured in correspondence with the respective generated magnetic fields. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus for driving a permanent magnet synchronous motor, comprising:
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a driving unit selectively controlling supply of a power source having a certain frequency to a stator winding that includes a plurality of windings which are disposed at certain intervals in a stator of the permanent magnet synchronous motor; a current measuring unit measuring a current which flows in the stator winding; and a controller controlling the driving unit on the basis of the current which is measured by the current measuring unit to drive the permanent magnet synchronous motor, or diagnosing demagnetization of a permanent magnet of the permanent magnet synchronous motor, wherein when the controller operates in a diagnosis mode for diagnosing demagnetization of the permanent magnet comprised in the permanent magnet synchronous motor; the controller controls the driving unit to cause generation of magnetic fields of which directions are respectively parallel to a predetermined direction among a plurality of directions passing through a rotation axis of a rotor, on a plane vertical to the rotation axis of the rotor which is in a standstill, and the controller compares a predetermined reference value and a comparison value to diagnose demagnetization of the permanent magnet attached to the rotor, the comparison value being calculated on the basis of magnitudes of currents which flow in the stator winding in correspondence with the respective generated magnetic fields. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification