Mitsubishi Electric Corporation

Koji Yabe

Kazuhiko Baba

Tomoaki Oikawa

Hayato Yoshino

Takahiro Tsutsumi

Naohiro Oketani

Yoshikazu Fujisue

Masahiro Nigo

Takaya Shimokawa

Yoshio Takita

Takanori Watanabe

Hironori Yabuuchi

Hiroshi Yamanaka

Kazuya Kumagai

Emi Tsukamoto

Hiroyuki Ishii

Hiroki Aso

Mineo Yamamoto

Junichiro Oya

Yuto Urabe

Koji Masumoto

Kazuchika Tsuchida

Atsushi Ishikawa

Atsushi Matsuoka

Takashi Ishigaki

Toshio Arai

Osamu Kazama

Takayuki Onihashi

A rotor includes a rotor core and a permanent magnet. The rotor core includes an outside slit provided between a permanent magnet insertion hole and an outer peripheral surface of the rotor core, and inside slits provided between a magnetic pole center part and the outside slit. A minimum distance from a first inside slit to the outer peripheral surface of the rotor core is longer than a minimum distance from any other inside slit except the first inside slit to the outer peripheral surface of the rotor core.

Rotor, electric motor, compressor, and air conditioner

A stator includes a stator core having a plurality of slots in a circumferential direction about an axis and having an end surface in a direction of the axis, and a first coil and a second coil of different phases which are wound on the stator core in distributed winding. A winding factor is 1. Each of the first coil and the second coil has winding portions, the number of which corresponds to the number of poles. The winding portions include first and second winding portions adjacent to each other in the circumferential direction. The first and second winding portions are inserted into one slot of the plurality of slots and extend from the one slot to both sides in the circumferential direction on the end surface. The first and second coils are annularly disposed in different positions in a radial direction about the axis on the end surface.

Stator, motor, compressor, air conditioner, and manufacturing method of stator

A stator includes a stator core and a coil wound around the stator core. The coil includes at least one first winding and at least one second winding connected to the first winding in series. The stator satisfies (C/S)&#x3e;(C/S), where Sis a total cross-sectional area on a first side of a coil-end part of the coil, Sis a total cross-sectional area on a second side of the coil-end part, Cis a total cross-sectional area of the first winding on the first side, and Cis a total cross-sectional area of the first winding on the second side.

Stator, electric motor, compressor, and air conditioner

An electric motor includes a rotor and a stator. The stator includes a first stator core located on a first side in the axial direction, and a second stator core located on a second side. The minimum distance from a rotor core of the rotor to the first stator core in the radial direction is smaller than the minimum distance from the rotor core to the second stator core in the radial direction. Each tooth of the first stator core includes a tooth end portion. The tooth end portion includes a main body extending in the radial direction, and a first portion extending in the circumferential direction, and a second portion projecting from the first portion in the radial direction.

Electric motor, compressor, fan, and refrigerating and air conditioning apparatus

A first coil including a first metal, and a second coil including a second metal having a lower electrical resistivity than the first metal are disposed in a slot of a stator core. The slot includes a slot opening, a curved slot bottom portion connecting to a yoke, and first and second side portions disposed between the slot opening and the slot bottom portion. A first straight line connects borders between the slot bottom portion and either of the side portions. A first region is surrounded by the first straight line and the slot bottom portion. A second region is located between the slot opening and the first straight line in the radial direction. Areas Sand Sof the first and second regions, and total cross-sectional areas Aand Aof the first coil in the first and second regions satisfy (A/S)&#x3e;(A/S).

Stator, motor, compressor, and air conditioner

An electric motor includes: a rotor including a first rotor core and a second rotor core; and a stator. A minimum distance from the first rotor core to the stator is shorter than a minimum distance from the second rotor core to the stator. A maximum radius of the first rotor core is longer than a maximum radius of the second rotor core. A shape of a first thin-wall part of the first rotor core and a shape of a second thin-wall part of the second rotor core are the same.

Electric motor, compressor, air blower, and refrigerating and air conditioning apparatus

A slot includes a coil housing portion having first and second side portions and a bottom portion. A first straight line connects first and second points which are boundaries between the bottom portion and the side portions. A slot opening has third and fourth points closest to the first and second side portions. A second straight line connects the first and third points. A third straight line connects the second and fourth points. A first region is surrounded by the first straight line and the bottom portion. A second region is surrounded by the second straight line and the first side portion, and is surrounded by the third straight line and the second side portion. A third region is surrounded by the three straight lines. Areas A1, A2 and A3 of the three regions and total cross-sectional areas S1, S2, S3 of coils therein satisfy (S1/A1)&#x3e;(S2/A2)&#x3e;(S3/A3).

Stator, motor, compressor, air conditioning apparatus, and method for manufacturing stator

A rotor includes a rotor core, a permanent magnet, a first part, a second part, and a third part. The third part is formed integrally with the first part and the second part. The rotor core is longer than the permanent magnet in an axial direction.

Consequent-pole type rotor, electric motor, air conditioner, and method for manufacturing consequent-pole type rotor

An electric motor includes a rotor including a first rotor end and a second rotor end, and a stator including a first stator end and a second stator end. The first rotor end is located apart from the first stator end toward the first side. The second rotor end is located apart from the second stator end toward the first side. The relationship between the distances D1 and D2 satisfies D1&#x3e;D2&#x2265;0, where D1 is a distance from a permanent magnet to a first end plate, and D2 is a distance from the permanent magnet to a second end plate. The thickness of each of a plurality of electrical steel sheets is not less than 0.1 mm and not more than 0.25 mm.

A hot-water supply system heats up water by power generated by power generation means. The hot water supply system includes a compressor and a water heat-up unit. In the hot-water supply system, the compressor compresses refrigerant and circulates the refrigerant through a refrigerant circuit. The water heat-up unit heats up water by changing, in accordance with the generated power, a rotation rate of an electric motor for driving the compressor.

Hot-water supply system, water heater, and control method for water heater

A rotor core has first and second magnet insertion holes along an outer circumference, and first and second slits along an inner circumference. The first and second slits have first and second facing portions facing each other. The first facing portion has a first inner end and a first outer end. The second facing portion has a second inner end and a second outer end. An inter-slit portion is provided between the first and second facing portions and is defined by a first straight line connecting the first and second inner ends and a second straight line connecting the first and second outer ends. In a radial direction of the rotor core, a minimum distance Dfrom the inner circumference to the slits, a minimum width Wof the slits, and a length Wof the inter-slit portion satisfy at least one of D&#x3c;Wand D&#x3c;W

Rotor, motor, compressor, fan, and air conditioning apparatus

A stator includes a stator core and a winding wound around the stator core in wave winding. The winding includes an assembly of a plurality of covered wires, and an outer cover film that surrounds and covers the assembly and contains thermosetting resin. Each of the covered wires includes a conductor and an insulating film surrounding and covering the conductor. Each of the covered wires has a wire width of 1.5 mm or less.

An electric motor includes a rotor and a stator. The rotor includes a rotor core and a plurality of permanent magnets fixed to an outer surface of the rotor core. The stator includes a stator core including a tooth part and a winding wound around the stator core. The electric motor satisfies an expression of 1&#x3c;t/t&#x2264;8 where tis a minimum distance from a center of a front end surface of the tooth part to one permanent magnet of the plurality of permanent magnets and tis a distance from an end of the tooth part to the one permanent magnet.

Electric motor, air blower, and air conditioner

A sensor magnet includes: a first magnetic-pole part including a magnetic pole of first polarity; a second magnetic-pole part including a magnetic pole of second polarity; and an inter-pole part formed between the first magnetic-pole part and the second magnetic-pole part. A width of the inter-pole part is larger than both of a width of the first magnetic-pole part and a width of the second magnetic-pole part.

Sensor magnet, rotor, electric motor, and air conditioner

A permanent-magnet synchronous motor includes: an annular stator core; a cylindrical rotor disposed inside the stator core, and having a first end face in an axial direction of the stator core and a second end face in the axial direction; a disk-shaped sensor magnet having a plurality of magnetic poles disposed circumferentially, and having a third end face and a fourth end face; and a magnetic sensor disposed so as to be opposed to the fourth end face in the axial direction, and detecting a rotating position of the sensor magnet. When a first thickness means the axial thickness at the center of each of the magnetic poles and a second thickness means the axial thickness of an inter-magnetic-pole portion between adjacent magnetic poles of the magnetic poles, the second thickness is greater than the first thickness.

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Tokyo, Japan

Koji Yabe