Electric motor, control device, and motor control system

An electric motor comprising:

• a supporting member which rotatably supports one side of a rotation shaft in an axis line direction via a mechanical bearing;
• a rotor which is attached to the rotation shaft and which includes a permanent magnet;
• a first coil which is attached to the supporting member and generates a magnetic field that generates a rotating force that rotates the rotor together with the rotation shaft;
• and
• a second coil which is attached to the supporting member and generates an electromagnetic force between the permanent magnet and the second coil, the second coil forming a magnetic bearing that rotatably supports the other side of the rotation shaft in the axis line direction from the mechanical bearing,
• wherein the rotation shaft, in which the mechanical bearing side is used as a fulcrum, is configured to be capable of being inclined with respect to a rotation center line of the rotation shaft, and
• wherein a control device controls a current that flows to the second coil such that an axis line of the rotation shaft is prevented from being inclined from the rotation center line by the electromagnetic force between the permanent magnet and the second coil.

An electric motor comprising:

• a rotation shaft which is rotatably disposed centered on a rotation center;
• a rotor which is attached to the rotation shaft and which includes a permanent magnet;
• a first coil which is supported by a supporting member, is disposed in a radial direction centered on the rotation center with respect to the permanent magnet, and generates a rotating force for rotating the rotor together with the rotation shaft by imparting a magnetic field to the permanent magnet;
• a second coil which is supported by the supporting member, is disposed in the radial direction centered on the rotation center with respect to the permanent magnet, and forms a magnetic bearing that raises up the rotation shaft to rotatably support the rotation shaft centered on the rotation center line by generating an electromagnetic force between the permanent magnet and the second coil;
• and
• a positional deviation detection sensor which detects an amount by which an axis line of the rotation shaft is shifted from the rotation center line based on the magnetic field generated from the permanent magnet,
• wherein a control device controls a current that flows to the second coil based on a detection value of the positional deviation detection sensor such that the axis line of the rotation shaft is prevented from separating from the rotation center line by the electromagnetic force between the permanent magnet and the second coil,
• wherein the positional deviation detection sensor is disposed between the rotation shaft and the permanent magnet, and
• wherein a distance between the positional deviation detection sensor and the rotation shaft is greater than a distance between the positional deviation detection sensor and the permanent magnet.

A control device which is a control device of an electric motor including

• a supporting member which rotatably supports one side of a rotation shaft in an axis line direction via a mechanical bearing,
• a rotor which is attached to the rotation shaft and which includes a permanent magnet,
• a first coil which is attached to the supporting member and generates a magnetic field that generates a rotating force for rotating the rotor together with the rotation shaft, and
• a second coil which is attached to the supporting member and generates an electromagnetic force between the permanent magnet and the second coil, the second coil forming a magnetic bearing that rotatably supports the other side of the rotation shaft in the axis line direction,
• wherein the rotation shaft is configured to be capable of being inclined with respect to a rotation center line of the rotation shaft using the mechanical bearing side of the rotation shaft as a fulcrum, the device comprising:
• a rotation shaft control unit which controls a current that flows to the second coil such that an axis line of the rotation shaft is prevented from being inclined with respect to the rotation center line by the electromagnetic force between the permanent magnet and the second coil.

An electric motor comprising:

• a stator which forms a plurality of magnetic poles that are aligned in a circumferential direction around a rotation center line of a rotation shaft, and which rotatably supports the rotation shaft via a mechanical bearing;
• a plurality of first coils and a plurality of second coils which are supported by the rotation shaft;
• a first commutator which includes a plurality of first segments that are supported by the rotation shaft and are aligned in the circumferential direction, and in which an end portion side of a corresponding first coil among the plurality of first coils is connected to the plurality of first segments;
• a plurality of first brushes which, according to a rotation of the first commutator, slides along the plurality of first segments to sequentially change between a contacting first segment among the plurality of first segments, the plurality of first brushes outputting a current to the plurality of first coils through the contacting first segment;
• a second commutator which includes a plurality of second segments that are supported by the rotation shaft and are aligned in the circumferential direction, and in which an end portion side of a corresponding second coil among the plurality of second coils is connected to the plurality of second segments;
• and
• a plurality of second brushes which, according to a rotation of the second commutator, slides along the plurality of second segments to sequentially change between a contacting second segment among the plurality of second segments, the plurality of second brushes outputting a current to the plurality of second coils through the contacting second segment,
• wherein a rotating force for rotating the rotation shaft centered on the rotation center line is generated as an electromagnetic force based on
• the current output from the plurality of first brushes to the plurality of first coils through the contacting segment, and
• a magnetic flux from the plurality of magnetic poles to the plurality of first coils, and
• wherein the plurality of second coils forms a magnetic bearing that rotatably supports a portion of the rotation shaft away from the mechanical bearing by generating an electromagnetic force between the plurality of magnetic poles based on the current output from the plurality of second brushes through the contacting second segment.