Magnetic geared rotating machine, power generation system, and magnetic pole piece rotor

A magnetic geared rotating machine, comprising:

• a stator which includes a plurality of stator magnets arranged so as to be aligned in a circumferential direction;
• a rotor which includes a plurality of rotor magnets arranged so as to be aligned in the circumferential direction, and in which a number of magnetic poles of the plurality of rotor magnets is less than a number of magnetic poles of the plurality of stator magnets;
• and
• a magnetic pole piece rotor which includes a plurality of magnetic pole pieces arranged so as to be aligned in the circumferential direction at a radial position between the stator and the rotor,
• wherein, in a radial cross section of the magnetic geared rotating machine, each of the magnetic pole pieces includes:
• an outer edge forming a first face of the magnetic pole piece, which is opposed to the rotor with a first air gap therebetween, and a second face of the magnetic pole piece, which is opposed to the stator with a second air gap therebetween;
• and
• at least one inner edge which is located between the first face and the second face in a radial direction so as to be surrounded by the outer edge, and defines at least one void inside the magnetic pole piece,
• wherein, in the radial cross section, a first distance which is a shortest distance between the first face and the void in the radial direction is shorter than a second distance which is a shortest distance between the second face and the void in the radial direction, and
• wherein, in the radial cross section, the second face is flat over an entire circumferential length of the magnetic pole piece.

A magnetic geared rotating machine, comprising:

• a stator which includes a plurality of stator magnets arranged so as to be aligned in a circumferential direction;
• a rotor which includes a plurality of rotor magnets arranged so as to be aligned in the circumferential direction, and in which a number of magnetic poles of the plurality of rotor magnets is less than a number of magnetic poles of the plurality of stator magnets;
• and
• a magnetic pole piece rotor which includes a plurality of magnetic pole pieces arranged so as to be aligned in the circumferential direction at a radial position between the stator and the rotor,
• wherein, in a radial cross section of the magnetic geared rotating machine, each of the magnetic pole pieces includes:
• an outer edge forming a first face of the magnetic pole piece, which is opposed to the rotor with a first air gap therebetween, and a second face of the magnetic pole piece, which is opposed to the stator with a second air gap therebetween;
• and
• at least one inner edge which is located between the first face and the second face in a radial direction so as to be surrounded by the outer edge, and defines at least one void inside the magnetic pole piece,
• wherein, in the radial cross section, a first distance which is a shortest distance between the first face and the void in the radial direction is shorter than a second distance which is a shortest distance between the second face and the void in the radial direction,
• wherein, in the radial cross section, the void includes:
• an axial hole which is a space opened in an axial direction of the magnetic geared rotating machine;
• and
• a communication slit which is located on a radially inner side of the axial hole and communicates with the axial hole,
• wherein the inner edge includes a pair of linear portions opposed to each other with the communication slit interposed therebetween, and
• wherein a maximum circumferential dimension of the axial hole in the axial direction is greater than a width of the communication slit between the pair of linear portions.