Mitsubishi Electric Corporation

Kazuya Kumagai

Yoshikazu Fujisue

Koji Yabe

Takahiro Tsutsumi

Masahiro Nigo

Moriyuki Hazeyama

Hironori Tsuiki

Yoshinori Iwanabe

Shuichi Kitano

Ryo Ishida

Takafumi Ichida

Yuta Mori

When a laminated core is formed in an annular shape, a radially inner part of a contact surface formed by a projecting end of a first core piece and a recessed end of another first core piece that are adjacent in a circumferential direction, and a radially inner part of a contact surface formed by a projecting end of a second core piece and a recessed end of another second core piece that are adjacent in the circumferential direction, are positioned in a plane including a center axis of the annular laminated core.

Laminated core for rotary electric machine, and rotary electric machine

Two types of insulating members, i.e., end surface insulators and slot insulators are provided. On tooth portion sides of both side surfaces in the circumferential direction of tooth end surface covering portions of the end surface insulator, first cutouts recessed in the circumferential direction are provided so as to extend in the radial direction. A part axially upward of the first cutouts protrudes in the circumferential direction to form a first overhang portion, and the slot insulator is accommodated between the first overhang portions of two end surface insulators.

Stator insulating members for rotary electric machine

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

An electric motor includes a stator and a rotor including a permanent magnet and an electromagnetic steel sheet. The electromagnetic steel sheet includes a magnet insertion hole, a first outer peripheral surface including an inter-pole part of the rotor, a second outer peripheral surface including a magnetic pole center part of the rotor, a first slit elongated in a circumferential direction of the rotor, and a first portion formed between the first slit and the magnet insertion hole. A distance from the first outer peripheral surface to the stator is larger than a distance from the second outer peripheral surface to the stator. The electric motor satisfies &#x3b8;a&#x3c;&#x3b8;b, where &#x3b8;a is a first angle formed by a first line and a second line and &#x3b8;b is a second angle formed by a third line and the second line.

Electric motor, compressor, air blower, and air conditioner

A magnetizing method includes the steps of preparing a rotor comprising a rotor core having a magnet insertion hole and a permanent magnet provided in the magnet insertion hole, placing the rotor so as to face a tooth around which a winding is wound, rotating the rotor in a first rotating direction by a first angle &#x3b8;from a rotational position where a center of the magnet insertion hole in a circumferential direction of the rotor core faces a middle portion between both ends of the winding in the circumferential direction and supplying electric current to the winding, and rotating the rotor in a second rotating direction opposite to the first rotating direction by a second angle &#x3b8;from the rotational position direction and supplying electric current to the winding. The second angle &#x3b8;is smaller than the first angle &#x3b8;

Magnetizing method, rotor, motor, and scroll compressor

A rotor includes a rotor core having a magnet insertion hole and a permanent magnet provided in the magnet insertion hole. The rotor core has a slit on an outer side of the magnet insertion hole in a radial direction of the rotor core. The permanent magnet is magnetized by placing the rotor so as to face a tooth around which a winding is wound, rotating the rotor in a first rotating direction from a rotational position where a center of the magnet insertion hole in a circumferential direction of the rotor core faces a middle portion between both ends of the winding in the circumferential direction and supplying electric current to the winding, and rotating the rotor in a second rotating direction opposite to the first rotating direction from the rotational position and supplying electric current to the winding.

Rotor, magnetizing method, motor, and scroll compressor

A stator of an electric motor () has windings () and a stator core () in which eighteen teeth (), around which the windings () are wound, are formed circumferentially. A rotor of the electric motor () has magnets () and a rotor core () in which six insertion holes (), into which the magnets () are inserted, are formed circumferentially. The magnets () are rare-earth magnets of a grain boundary diffusion type having a residual magnetic flux density Br of from 1.36 to 1.42 T. The total area of magnet-parallel cross-sections () of the teeth () is from 0.56 times to 0.93 times the total area of tooth-facing surfaces () of the magnets ().

Electric motor, compressor, and refrigerating cycle apparatus

A motor rotor includes a rotor core having a plurality of magnet insertion holes in each of which a permanent magnet is inserted, a flow path formed on a radially inner side of the plurality of magnet insertion holes to allow a fluid to flow through, and a shaft insertion hole in which a rotary shaft is inserted, and the permanent magnet inserted in each of the plurality of magnet insertion holes of the rotor core. The rotor core has an inlet opening and an outlet opening each opened in a corresponding one of end faces of the rotor core in an axial direction, and a communication hole circumferentially extending inside the rotor core and communicating with the inlet opening and the outlet opening.

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Tokyo, Japan

Kazuya Kumagai