Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Koji Masumoto

Yuki Tamura

Ryohei Uno

Kazuhiro Shono

Kazuyuki Yamamoto

Yusuke Nakagawa

Kazuhiko Baba

Koji Yabe

Tomoaki Oikawa

Keisuke Kato

Hayato Yoshino

Kohei Tatsuwaki

Yoshio Takita

Yoshiyuki Terai

Mariko Nagai

Masahiro Nigo

Hideyuki Nakamura

Tomokazu Matsui

Yuji Takamura

Takashi Ishigaki

Shuhei Koyama

Osamu Kazama

Kei Iwata

Nobukazu Kosone

Tsuneyoshi Tajima

Yutaro Iwamoto

Tetsuro Hirami

Syuhei Koyama

Masaki Katou

Kenjiro Motomura

Wataru Sasano

A scroll compressor includes: a shell; a compression mechanism unit accommodated in the shell and defining a compression chamber, the compression mechanism unit having a discharge port through which a discharge chamber and the compression chamber communicate with one another; a discharge valve mechanism that opens and closes the discharge port. The discharge valve mechanism includes a valve seat provided on an outlet portion of the discharge port and a valve and closes the valve seat when sitting on the valve seat. The valve seat includes an annular portion serving as an edge of an opening of the outlet portion and a valve supporting portion that is provided in a region surrounded by the inner circumference of the annular portion and divides the opening of the outlet portion into plural valve seat holes. The valve is in contact with at least a portion of the valve supporting portion and with the annular portion, when sitting on the valve seat.

Scroll compressor and refrigeration cycle apparatus

A compressor includes: a shell forming an outer portion thereof and having lower part in which an oil pan is formed to store oil; a motor provided in the shell; a compression unit provided in the shell to compress a working gas when being driven by the motor; a frame fixed to the shell and supporting the compression unit; a shaft supported by the frame, connecting the motor and the compression unit, provided to transmit a turning force of the motor to the compression unit, and including an oil passage; and an oil pump provided at lower part of the shaft to draw oil from the pan and supply the oil into the oil passage. The pump includes a bypass valve that is opened, when a pressure of oil flowing in the oil passage is higher than a threshold pressure, to return part of the oil to the pan.

Compressor having orbiting scroll supply hole to lubricate thrust surface

A motor includes a stator unit formed by coupling plural stators to one another into an annular shape. Each of the stators has: an iron core having an arc-shaped core-back portion and a tooth portion protruding from the core-back portion, the iron core forming slot portions between the iron core and adjacent ones of the stators; insulating members disposed on both end portions, in the axial direction, of the iron core; insulating films disposed so as to be in contact with inner walls of the slot portions of the iron core; and a winding disposed in the slot portions and wound over the iron core with the insulating members and the insulating films interposed therebetween. In a portion of each of the insulating films that is in contact with the inner wall of the slot portion, at least a portion that is in contact with an outer circumferential surface of the tooth tip portion has a length in the axial direction longer than the length of the iron core in the axial direction. Each of the insulating members has position fixing portions that are engaged with the iron core to fix the position of the insulating member.

Motor and compressor including the same

A motor includes an annular core formed by stacking a plurality of electromagnetic steel sheets; end plates disposed at both ends of the core in an axial direction; a balance weight disposed on a side of one of the end plates, the side being opposite the core; and a spacer disposed between the one of the end plates and the balance weight, the spacer being configured to create a space between the one of the end plates and the balance weight. The motor is entirely fastened by allowing at least one of a plurality of rivets arranged in a circumferential direction of the core to pass through the core and the end plates in the axial direction, and allowing remaining at least one rivet to pass through the core, the end plates, the spacer, and the balance weight in the axial direction.

Motor including a balance weight and compressor provided with the same

A scroll compressor includes an orbiting scroll including an end plate and a spiral element on the end plate, a fixed scroll including an end plate and a spiral element on the end plate, and an Oldham ring including a support. The scroll compressor satisfies a relation of &#x3b4;1&#x3e;&#x3b4;2, where &#x3b4;1 denotes each of the axial length of a gap between the tip of the spiral element of the orbiting scroll and the end plate of the fixed scroll and a gap between the tip of the spiral element of the fixed scroll and the end plate of the orbiting scroll, and &#x3b4;2 denotes the axial length of a gap between the end plate of the orbiting scroll and the support of the Oldham ring.

Scroll compressor having gap between tip spiral scroll wrap to end plate of fixed and orbiting scrolls that differs in axial length from gap between support of oldham ring and end plate of orbiting scroll

A magnetic pole includes a core, winding frames, and sheet-like insulators. The winding frames are provided to both ends, in a direction along the central axis, of the core, and have thin portions and projections. The thin portions and the projections extend in a direction along the central axis. The insulators are provided on both sides in the circumferential direction of a tooth portion. A part of each insulator is held by being sandwiched between the projection and the thin portion provided to each winding frame.

Magnetic pole, magnetic pole manufacturing method, and stator

An electric motor includes a stator unit, insulators, windings and insulating films. In the stator unit, a plurality of stators including respective iron cores each made of a magnetic body are arranged annularly. The insulators are provided at ends of the iron cores in an axial direction of the stator unit. The windings are wound around the insulators. The insulating films insulate the iron cores and the windings from each other. The insulating films are fixed between the iron cores and the insulators.

Electric motor and compressor provided with the same

A rotor core is configured by stacking a plurality of core plates each including: an inner peripheral side core portion; an outer peripheral side core portion; a magnet insertion hole; a radial connection portion to be connected to the inner peripheral side core portion; a circumferential connection portion to be connected between the outer peripheral side core portion and the radial connection portion, including a minimum width portion having a width smaller than widths at both ends, and having a width smoothly decreasing from both ends toward the minimum width portion; and a thin portion including a uniform thickness portion which is provided in the circumferential connection portion and which has a uniform thickness and a non-uniform thickness portion which is adjacent to the uniform thickness portion and which has an increasing thickness, the thin portion having the minimum width portion within the uniform thickness portion.

Rotor, rotating electric machine, electric compressor, and refrigeration/air-conditioning apparatus

A rotor core in which magnets are embedded is formed by stacking a plurality of steel sheets. Each steel sheet which has a disk shape has: six magnet insertion holes formed so as to allow permanent magnets to be inserted therein as a whole; circumferential-direction bridge portions connecting, in the circumferential direction, radially-outer-side steel sheets each formed at the peripheral part of the steel sheet, between the magnet insertion holes; and radial-direction bridge portions formed between the magnet insertion holes. The circumferential-direction bridge portions and the radial-direction bridge portions have coined portions having decreased sheet thicknesses and protruding in an arc shape in the sheet-thickness direction. The coined portions having decreased sheet thicknesses suppress short-circuit of a magnetic flux between magnetic poles, and formation of the arc shapes absorbs extension of these portions caused by a coining work, to suppress deformation of the steel sheet.

Rotor for rotary electric machine, rotary electric machine provided with same, and method for manufacturing rotor for rotary electric machine

A rotor includes a rotor core which is formed by stacking steel plates and includes a first through hole in a center part, at least one second through hole in the vicinity of the first through hole and a rivet insertion hole. The rotor also includes permanent magnets which are disposed in a circumferential direction of the rotor core and are embedded in a stacking direction of the steel plates; a main shaft which is shrink-fitted or press-fitted in the first through hole of the rotor core; a pin made of an insulating material and inserted in the second through hole of the rotor core; and an upper end plate and a lower end plate which are disposed on both ends of the rotor core in the stacking direction and are fixed by a rivet inserted in the rivet insertion hole.

Permanent magnet motor with a rotor having press fitted rivets and press fitted shaft and pin holes and a method for manufacturing the rotor

In an electric motor, an n-th layer of windings includes: a first winding portion wound from a radially outer side of the stator to a radially inner side of the stator so as to form a gap dimensioned to one pitch or more of the windings at a preset position; and a second winding portion wound from the radially inner side of the stator to the radially outer side of the stator in a continuous manner from the first winding portion so as to fill in the gap, the second winding portion crossing the first winding portion. The gap is formed at a position that is at an intermediate portion of the tooth in a stator radial direction and that is a position at which the windings switch from the n-th layer to an (n+1)th layer.

Electric motor, compressor including the same, and method of manufacturing electric motor

An object is to provide a permanent magnet motor that highly reduces torque fluctuation, thereby reducing noise and vibration. The permanent magnet motor may be formed as follows: a length D of a permanent magnetin a longitudinal direction is the same as or longer than a width A between sides of the magnetic pole toothin the circumferential direction in an end portion of the magnetic pole tooth, and a distance C between tip portions of a pair of the first slitsandwithin the same pole is smaller than the width A between the sides of the magnetic pole toothin the circumferential direction in the end portion of the magnetic pole tooth. The permanent magnet motor, thus formed, may be characterized in that cut surfacesface the first slitsand

Permanent magnet motor, hermetic compressor, and fan motor

It is an objective to provide a permanent magnet synchronous motor that is highly efficient with low vibration and low noise. A statorincludes a stator corethat includes magnetic pole teetheach formed between adjacent slots, and stator windingsthat are provided in the slotsof the stator core. A rotorincludes a rotor core, a plurality of magnet retaining holes, permanent magnetsinserted in the magnet retaining holes, and a plurality of slitsin the rotor coreon an outer circumferential side of the magnet retaining holes. Among the slits, slitsin a vicinity of a magnetic pole center of the rotor coreare oriented in a direction where a magnetic flux generated by a permanent magnetconverges outside the rotor core, whereas slitsin a vicinity of a pole border portion of the rotor coreare oriented in another direction that is different from the direction of the plurality of slitsin the vicinity of the magnetic pole center of the rotor core

Permanent magnet synchronous motor and hermetic compressor

To provide a permanent-magnet motor having a permanent magnet which can reduce the vibration and the noise without lowering the efficiency of the motor, the permanent-magnet motor according to, the present invention has a stator 1 having stator winding of plural phases, a rotor having a stator core facing to inside of the stator across a gap part and a permanent magnet provided to the rotor core. In the permanent-magnet motor, the permanent magnet is made to have both a convex part to the inner diameter side and a convex part to the outer diameter side in the cross section taken vertically to the rotation axis, and a focus of magnetic orientation of each magnetic pole of the permanent magnet is located outside of the rotor

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Tokyo, Japan

Koji Masumoto