Rotating electric machine and manufacturing method therefor
View Patent ↗There is provided a rotating electric machine including a rotation sensor unit capable of demonstrating a shielding effect over a wide frequency bandwidth and a manufacturing method therefor. In the rotating electric machine, a power unit provided with a switching element that controls an electric current that flows in a stator winding and a magnetic-field current control circuit unit provided with a switching element that controls an electric current that flows in a rotor winding are arranged on a predetermined surface of one of a pair of brackets that pivotably support a rotor shaft, and the rotation sensor unit is disposed in the vicinity of the predetermined surface of the one bracket; The rotating electric machine is characterized in such a way that there is provided a ring-shaped member that is fixed on the outer surface of the rotation sensor unit, and the ring-shaped member is configured with a non-magnetic unit having an electric conductivity and a magnetic unit.
1. A rotating electric machine comprising:
a power unit provided with a switching element that controls an electric current that flows in a stator winding provided in a stator;
a magnetic-field current control circuit unit provided with a switching element that controls an electric current that flows in a rotor winding provided in a rotor; and
a rotation sensor unit comprising:
a sensor rotor fixed on a rotor shaft that supports the rotor;
a sensor stator that faces the sensor rotor by the intermediary of a gap; and
a sensor winding provided on the sensor stator, the rotation sensor unit outputting from the sensor winding an output in accordance with a rotation position of the sensor rotor,
wherein the power unit and the magnetic-field current control circuit unit are arranged on a predetermined surface of one of a pair of brackets that pivotably support the rotor shaft, and the rotation sensor unit is disposed in the vicinity of the predetermined surface of the one bracket; and
wherein there is provided a ring-shaped member that is fixed on the outer surface of the sensor stator and configured with a non-magnetic unit having an electric conductivity and a magnetic unit.
2. The rotating electric machine according to claim 1 , wherein the magnetic unit included in the ring-shaped member is formed of a material composed mainly of ferrite.
3. The rotating electric machine according to claim 1 ,
wherein the non-magnetic unit included in the ring-shaped member is provided with a notched portion for pulling out a terminal member connected with a winding end portion of the sensor winding; and
wherein the magnetic unit included in the ring-shaped member has an axis-direction length that is always the same over the whole circumference thereof, and is provided in such a way as to cover the whole circumference of the rotation sensor unit.
4. The rotating electric machine according to claim 3 , wherein the terminal member is molded with a resin member that is inserted into the notched portion in the non-magnetic unit.
5. The rotating electric machine according to claim 3 ,
wherein the magnetic unit included in the ring-shaped member is held in the non-magnetic unit in such a way as to extend, along the rotor shaft, longer than at least the sensor stator; and
wherein the non-magnetic unit is provided in such a way as to extend, along the rotor shaft, longer than at least the sensor winding.
6. The rotating electric machine according to claim 3 , wherein the magnetic unit is disposed outside the circumferential periphery of the non-magnetic unit.
7. A production method for a rotating electric machine according to claim 1 , wherein, after the rotation sensor unit and the ring-shaped member are preliminarily fixed to each other, the rotation sensor unit is provided in the rotating electric machine.