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 at predetermined directions 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 which is calculated on the basis of the stator winding currents which are measured in correspondence with respective magnetic fields which are in opposite directions about the rotation axis of the rotor to diagnose demagnetization of a permanent magnet attached to the rotor.
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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.
25 Citations
14 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 at predetermined directions 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 which is calculated on the basis of the stator winding currents which are measured in correspondence with respective magnetic fields which are in opposite directions about the rotation axis of the rotor to diagnose demagnetization of a permanent magnet attached to the rotor. - 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 at predetermined directions 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 which is calculated on the basis of the stator winding currents which are measured in correspondence with respective magnetic fields which are in opposite directions about the rotation axis of the rotor to diagnose demagnetization of a permanent magnet attached to the rotor. - View Dependent Claims (11, 12, 13, 14)
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Specification