Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Other

Kajima Corporation

Yoshio Takita

Hayato Yoshino

Hitoshi Kawaguchi

Koji Yabe

Kazuhiko Baba

Tomoaki Oikawa

Koji Masumoto

Masahiro Nigo

Shinichi Takahashi

Takahiro Tsutsumi

Takashi Ishigaki

Shigeru Ban

Masao Saito

Osamu Kazama

Yoshiki Mihara

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

It is an object to obtain a highly efficient and low-cost single-phase motor by producing the motor in a form that allows a proper material layout, with securing a magnetic path of a coreback of a stator iron core. A stator iron coreformed by laminating a plurality of electromagnetic steel sheets and provided with N slots, where N/2 is odd, a part of which are large slotsand others are small slotshaving a shallower depth in a radial direction; a main windingof 2-pole single-phase concentric winding arrangement inserted to the large slotsor the small slots; and an auxiliary windingof 2-pole single-phase concentric winding arrangement inserted to the large slotsor the small slotsand arranged at a location which is dislocated by other than 90 degrees in electrical angle from the main windingare included, and among the N slots, slots of which the occupying rate of winding is made smaller than others by arranging the auxiliary windingat a location which is dislocated by other than 90 degrees in electrical angle from the main windingare made the small slots, and other slots are made the large slots

Single-phase 2-pole electric motor in which main windings and auxiliary windings are mutually offset by other than 90 degrees and mounted in different size slots

It is an object to obtain a highly efficient and low-cost single-phase motor and a hermetic compressor employing the motor by producing the motor in a form that allows a proper material layout, with securing a magnetic path of a coreback of a stator iron core. According to the present invention, in a single-phase motor having a stator including a stator iron core formed by laminating a plurality of electromagnetic steel sheets and provided with a slot and single-phase two-pole distributed windings composed of a main winding and an auxiliary winding contained in the slot, and a rotor placed through a gap on an inner circumference of the stator, at least five notches each having a roughly straight lined shape are provided on an outer circumference of the stator iron core, so that a quadrangle is formed by straight lines including four notches out of the at least five notches.

Single-phase motor and hermetic compressor

It is an object to obtain a highly efficient synchronous induction motor by letting the magnetic flux hardly pass in the direction of a q axis without interrupting a magnetic path in the direction of a d axis and by increasing a salient pole difference. A slit next to a shaftis extended towards the shaft along a circumference of the shaftto form an extended part of slit. In addition, a gas vent holeis formed as a slender opening stretched in the direction of d axis, and a slit is projected along the circumference of the gas vent hole. Further, the gas vent holeis formed as a slender opening stretched in the direction which is displaced by a predetermined angle from the d axis. Yet further, a rotor iron coreis formed by a plurality of rotor iron core portions in the laminating direction, and the rotor iron core portions have different shapes of slits, respectively.

Rotor of synchronous induction motor and compressor

There are problems in a rotor having a slit that it is difficult to increase the number of rotations of the rotor, since the centrifugal force is received at both ends of the slit, and if the connection part is made thick to increase the number of rotations, the properties of the motor is deteriorated. According to the present invention, a rotor for a synchronous motor includes a slot for generating induction torque and a slit for generating reluctance torque, the slit is filled with a filler, the slit is provided with at least one of a convex and a concave, so that the convex and the concave are formed so as to receive the centrifugal force which is generated by the rotation of the rotor and acts on a part of the rotor outside the slit and the filler so as to bulge toward the outside from the center side of the rotor by mechanical bondage of the filler and the rotor core.

Rotor for synchronous induction motor, synchronous induction motor, fan motor, compressor, air conditioner, and refrigerator

A rotor of a synchronous induction electric motor according to the present invention includes a slot for generating induction torque and a slit for generating reluctance torque. The slot and the slit are filled up with aluminum which is short-circuited by an end-ring at each of both ends of the rotor, and the slit includes a non-filling part penetrating in the direction of the rotational axis and not filled up with the aluminum.

Rotor of a synchronous induction electric motor

A synchronous inductance motor provided in a rotor includes at least a pair of slit portions forming a two-pole magnetic polar projection having an easy-to-pass direction of the magnetic flux, i.e., q-axis and a difficult-to-pass direction of the magnetic flux, i.e, d-axis which are almost orthogonal and a plurality of slot portions close to an outer circumference in the slit portions and connected to at least an end of the slit portion in a direction of the d-axis for generating inductance torque. Further, conductivity material is filled in the slit portions and the slot portions.

Synchronous inductance motor, a manufacturing method of the synchronous inductance motor, and a compressor

The present invention aims to strengthen the durability against the centrifugal force acted on a rotor of a synchronous induction motor to increase reliability of the motor. The rotor for the synchronous induction motor of the invention includes: at least one pair of slits forming salient poles in a direction of a d axis in which the magnetic flux can flow easily and in a direction of a q axis in which the magnetic flux can hardly flow; and plural slots located at an outer circumference side of the slits and connected to at least one end of the slits in the direction of the d axis to generate induction torque. Conductive material is filled in at least the slots among the slits and the slots. The rotor is provided with a rotor cover made of a non-magnetic body as a reinforcing member to strengthen the rotor against the centrifugal force acted at the outer side of the direction of a diameter.

Rotor for synchronous induction motor, including slots and slits, and compressor

The conventional slit is symmetrically aligned with respect to the q-axis that is a direction where the magnetic flux is difficult to flow. Because of this, the generated magnetic flux must jump over the slit, whereas its jumping over position being dependent on the rotation of the rotor. This hinders a flow of the magnetic flux. This has caused problems such as making the efficiency worse and increasing the losses. Therefore, at least one pair of slits is constructed on the rotor, which forms the salient pole so as to obtain the d-axis (where the magnetic flux is easy to flow) and the q-axis (where the magnetic flux is difficult to flow). A low magnetic resistance parts having a small magnetic resistance are formed at these slits that are asymmetrically aligned with respect to the q-axis.

Synchronous motor, fan, compressor, refrigeration and air-conditioning machines

Winding holding means 8 for retaining windings 6 are respectively provided at axially opposite end portions of each pole protrusion 5 of a stator on the inner peripheral side of the pole protrusions.

Reluctance motor and compressor-driving reluctance motor

A space tension chord arch member dome reinforced with tension members and method of construction. Maximum building space is ensured by using tension chord members, which reduces the material costs and simplifies assembly of the dome. The system permits use of laminated wood for the arch members of the dome superstructure.

Growing community of inventors

Tokyo, Japan

Yoshio Takita