Magnetic field generating device and electric motor including the same

A magnetic field generating device comprising:

• a magnetic pole element that includes
• a plurality of magnetic element iron cores,
• a plurality of permanent magnets, and
• at least one support member,
• the plurality of magnetic element iron cores each being formed of a magnetic material, and the at least one support member being formed of a non-magnetic material;
• and
• a facing magnetic body disposed so as to face the magnetic pole element in an opposing direction with a gap interposed between the facing magnetic body and the magnetic pole element, wherein
• the plurality of magnetic element iron cores are arranged along an arrangement plane perpendicular to the opposing direction, wherein
• the plurality of magnetic element iron cores include a plurality of first iron cores,
• a plurality of second iron cores,
• a plurality of third iron cores, and
• a plurality of fourth iron cores, wherein
• the plurality of first iron cores and the plurality of third iron cores are disposed so as to be alternately arranged along a first arrangement direction extending along the arrangement plane, thereby forming a first iron core row,
• the plurality of second iron cores and the plurality of fourth iron cores are disposed so as to be alternately arranged along the first arrangement direction, thereby forming a second iron core row,
• the plurality of first iron cores are respectively adjacent to the plurality of second iron cores in a second arrangement direction, and the second arrangement direction is a direction extending along the arrangement plane and perpendicular to the first arrangement direction, and
• the plurality of third iron cores are respectively adjacent to the plurality of fourth iron cores in the second arrangement direction, wherein
• the first iron cores include
• a first magnetic pole surface that has a first magnetic pole and that faces the facing magnetic body in the opposing direction, and
• a first back surface that faces an opposite side from the first magnetic pole surface in the opposing direction,
• the second iron cores include,
• a second magnetic pole surface that has a second magnetic pole and that faces the facing magnetic body in the opposing direction, and
• a second back surface that faces an opposite side from the second magnetic pole surface in the opposing direction,
• the third iron cores include
• a third magnetic pole surface that has a third magnetic pole and that faces the facing magnetic body in the opposing direction, and
• a third back surface that faces an opposite side from the third magnetic pole surface in the opposing direction, and
• the fourth iron cores include
• a fourth magnetic pole surface that has a fourth magnetic pole and that faces the facing magnetic body in the opposing direction, and
• a fourth back surface that faces an opposite side from the fourth magnetic pole surface in the opposing direction, wherein
• the plurality of permanent magnets include
• a plurality of back surface permanent magnets respectively disposed on the first back surface, the second back surface, the third back surface, and the fourth back surface, wherein
• the first magnetic pole and the fourth magnetic pole are magnetic poles that are identical to each other and that are opposite to both the second magnetic pole and the third magnetic pole, and
• the second magnetic pole and the third magnetic pole are magnetic poles that are identical to each other and that are opposite to both the first magnetic pole and the fourth magnetic pole, and wherein
• the at least one support member includes
• an inner support member positioned between the first iron core row and the second iron core row, and
• the inner support member supports the plurality of first iron cores and the plurality of third iron cores on one side of the inner support member in the second arrangement direction, and simultaneously, supports the plurality of second iron cores and the plurality of fourth iron cores on another side of the inner support member in the second arrangement.