Permanent magnet motor

1. A permanent magnet motor, comprising:

an armature;

a rotor; and

an angle detector,

wherein the armature includes:

an armature iron core; and

an armature winding,

wherein the rotor includes:

a rotor iron core; and

a permanent magnet

wherein the angle detector includes:

a sensor magnet; and

a semiconductor sensor,

wherein the rotor iron core including the permanent magnet is fixed to a rotation shaft,

wherein the sensor magnet is magnetized into two poles and is provided in an end portion of the rotation shaft, and has the same rotary axis as a rotary axis of the rotation shaft,

wherein the semiconductor sensor is opposed to the sensor magnet in an extension direction of the rotation shaft;

wherein the semiconductor sensor and the sensor magnet have a gap formed therebetween,

wherein a plate member made of a magnetic substance is provided between the semiconductor sensor and an end surface of the armature iron core, and

wherein the plate member comprises a first section extending in a axial direction from the end surface of the armature core toward the semiconductor sensor and a second section extending from the first section in a radial direction toward the rotary axis of the rotation shaft.

2. A permanent magnet motor according to claim 1 , wherein the permanent magnet motor includes any one of a 10-pole and 12-slot type magnet motor, a 14-pole and 12-slot type magnet motor, and a 14-pole and 18-slot type magnet motor.

3. A permanent magnet motor according to claim 1 , wherein the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 in which phases of supply currents are the same between two phases of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 .

4. A permanent magnet motor according to claim 1 , wherein:

the permanent magnet motor includes any one of a 10-pole and 12-slot type magnet motor and a 14-pole and 12-slot type magnet motor;

the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 and W 2 in which two phases of supply currents of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 have a phase difference of 30 degrees in an electrical angle; and

the permanent magnet motor is driven through current supply only to three phases of U 2 , V 2 , and W 2 different in a phase of the supply current by 120 degrees from one another, without current supply to the other three phases.

5. A permanent magnet motor according to claim 1 , wherein the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 in which the windings of the two phases of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 have the same number of turns, and are stored in the same slot.

6. A permanent magnet motor according to claim 2 , wherein the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 in which the windings of the two phases of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 have the same number of turns, and are stored in the same slot.

7. A permanent magnet motor according to claim 3 , wherein the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 in which the windings of the two phases of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 have the same number of turns, and are stored in the same slot.

8. A permanent magnet motor according to claim 4 , wherein the armature winding has six phases of U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 in which the windings of the two phases of each of sets of U 1 and U 2 , V 1 and V 2 , and W 1 and W 2 have the same number of turns, and are stored in the same slot.