A compressor includes: a stator core including a plurality of teeth around which an aluminum winding wire is wound in a concentrated manner; a rotor core disposed on an inner diameter side of the stator core and including a plurality of magnet insertion holes; and a plurality of ferrite magnets inserted in the magnet insertion holes, in which when a width of a winding wire portion formed in each of the teeth is represented as A, a length in an axis direction of the stator core is represented as L, and the number of slots is represented as S, the stator core has a shape that satisfies a relation of 0.3<S×A÷L<2.2.

A compressor includes: a stator core including a plurality of teeth around which an aluminum winding wire is wound in a concentrated manner; a rotor core disposed on an inner diameter side of the stator core and including a plurality of magnet insertion holes; and a plurality of ferrite magnets inserted in the magnet insertion holes, in which when a width of a winding wire portion formed in each of the teeth is represented as A, a length in an axis direction of the stator core is represented as L, and the number of slots is represented as S, the stator core has a shape that satisfies a relation of 0.3<S×A÷L<2.2.

An electric sander motor includes a motor main body (100), a power axial shaft (210) and a sleeve (220). The motor main body (100) includes a rotor (110) and a stator (120) surrounding the rotor (110). The power axial shaft (210) includes an axial hole (211) extending along a central axis of the power axial shaft (210). The sleeve (220) includes one open end and another closed end extended outward to form an eccentric axial shaft (221) penetrating through the axial hole (211). A central axis of the eccentric axial shaft (211) is parallel with a central axis of the sleeve (220) and spaced apart therefrom. The power axial shaft (210) penetrates through the rotor (110), and the sleeve (220) is outside the motor main body (100). The assembly is facilitated by assembling the power axial shaft (210) and the sleeve (220) onto the motor main body (100) sequentially.

An electric sander motor includes a motor main body (100), a power axial shaft (210) and a sleeve (220). The motor main body (100) includes a rotor (110) and a stator (120) surrounding the rotor (110). The power axial shaft (210) includes an axial hole (211) extending along a central axis of the power axial shaft (210). The sleeve (220) includes one open end and another closed end extended outward to form an eccentric axial shaft (221) penetrating through the axial hole (211). A central axis of the eccentric axial shaft (211) is parallel with a central axis of the sleeve (220) and spaced apart therefrom. The power axial shaft (210) penetrates through the rotor (110), and the sleeve (220) is outside the motor main body (100). The assembly is facilitated by assembling the power axial shaft (210) and the sleeve (220) onto the motor main body (100) sequentially.

A motor includes a rotor and stator. The stator includes a stator iron core having a substantially annular yoke, and a plurality of teeth extending from the yoke toward the rotor. Each tooth includes an extending portion with a winding wire wound in a concentrated manner to form a coil, and flange portions extending circumferentially from a tip end portion of the extending portion. The plurality of teeth include adjacent first second teeth with coils having identical phases, and adjacent third and fourth teeth with coils having different phases. A first magnetic resistance circumferentially from a tip end portion of the first flange portion to a center of the extending portion of the first tooth is higher than a second magnetic resistance circumferentially from a tip end portion of the second flange portion to a center of the extending portion of the third tooth.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

An electric work machine reduces a decrease in the detection accuracy of rotation of a rotor while avoiding generation of insufficient reluctance torque. The electric work machine includes a brushless motor including a rotor and a stator, and a magnetic sensor. The rotor includes a rotor core and permanent magnets. The magnetic sensor faces a first end of the rotor core to detect rotation of the rotor. The rotor core includes a first core including the first end and first slots, and a second core including second slots. The permanent magnets are received in the corresponding first and second slots. The first core includes a first portion between first slots adjacent in a circumferential direction. The second core includes a second portion between second slots adjacent in the circumferential direction. The first portion has a dimension smaller than a dimension of the second portion in the circumferential direction.

An electric work machine reduces a decrease in the detection accuracy of rotation of a rotor while avoiding generation of insufficient reluctance torque. The electric work machine includes a brushless motor including a rotor and a stator, and a magnetic sensor. The rotor includes a rotor core and permanent magnets. The magnetic sensor faces a first end of the rotor core to detect rotation of the rotor. The rotor core includes a first core including the first end and first slots, and a second core including second slots. The permanent magnets are received in the corresponding first and second slots. The first core includes a first portion between first slots adjacent in a circumferential direction. The second core includes a second portion between second slots adjacent in the circumferential direction. The first portion has a dimension smaller than a dimension of the second portion in the circumferential direction.

A technique by which the magnetic flux of the magnetic pole facing the stator of the magnet can be further increased in a rotor, is provided. An electric motor according to the present disclosure includes a stator 10; a rotor 20 facing the stator 10 in an axial direction (first direction) and configured to be rotatable in a circumferential direction (second direction) that is orthogonal to the axial direction; and a short-circuit reduction member 25, 26, wherein the rotor 20 includes a main magnet 22 having a first magnetic pole on a surface facing the stator 10; an auxiliary magnet 23, 24 arranged adjacent to the main magnet 22 and having a second magnetic pole and a third magnetic pole that is different in polarity from the second magnetic pole, and configured to increase a magnetic flux of the first magnetic pole, and wherein the auxiliary magnet 23, 24 is arranged adjacent to the main magnet 22 in a radial direction (third direction) that is orthogonal to the axial direction, and the short-circuit reduction member 25, 26 is provided at a portion around the auxiliary magnet 23, 24 facing the auxiliary magnet 23, 24 in parallel with a virtual line connecting the second magnetic pole and the third magnetic pole, to reduce a short-circuit of a magnetic flux between the second magnetic pole and the third magnetic pole.