The single-phase induction motor includes a stator fixed in a cylindrical frame by shrink-fitting or press-fitting, a main winding wire and an auxiliary winding wire provided on the stator, and a rotor provided on an inner circumferential side of the stator, in which an arc-shaped arc portion and a linear cutout portion are formed on an outer circumference of the stator, the arc portion is arranged on the outer circumference of the stator in a direction of the main winding wire magnetic pole with respect to the center of the stator, and a relief portion for reducing a contact area between the arc portion and an inner circumferential surface of the frame is formed on the arc portion.

A single phase brushless motor includes a stator and a rotor. The stator includes a stator core and stator windings wound on the stator core. The stator core includes a yoke portion, and first and second pole portions extending inwardly from the yoke portion. An end surface of the first pole portion includes a first arc surface having a first groove. An end surface of the second pole portion includes a second arc surface having a second groove. The first and second arc surfaces are opposed to each other and define a receiving space therebetween. The rotor includes a rotary shaft and permanent magnetic poles fixed to the rotary shaft. The permanent magnetic poles are received in the receiving space. A substantially uniform gap is formed between the first arc surface and the second arc surface and the permanent magnetic poles.

A single phase brushless motor includes a stator and a rotor. The stator includes a stator core and stator windings wound on the stator core. The stator core includes a yoke portion, and first and second pole portions extending inwardly from the yoke portion. An end surface of the first pole portion includes a first arc surface having a first groove. An end surface of the second pole portion includes a second arc surface having a second groove. The first and second arc surfaces are opposed to each other and define a receiving space therebetween. The rotor includes a rotary shaft and permanent magnetic poles fixed to the rotary shaft. The permanent magnetic poles are received in the receiving space. A substantially uniform gap is formed between the first arc surface and the second arc surface and the permanent magnetic poles.

There is a growing need for line-start single-phase electric motors that provide in combination high starting torque, high efficiency and low acoustic signature, particularly for use in hermetically sealed devices including, but not limited to, reciprocating piston systems for power generation and gas compression. This disclosure provides is a single-phase induction machine that meets this need.

There is a growing need for line-start single-phase electric motors that provide in combination high starting torque, high efficiency and low acoustic signature, particularly for use in hermetically sealed devices including, but not limited to, reciprocating piston systems for power generation and gas compression. This disclosure provides is a single-phase induction machine that meets this need.

This invention aims at developing an Induction Motor that consumes less power than existing Induction Motors. An efficient Induction motor comprises a stator that includes three field windings and a rotor that includes rotor conductors short-circuited at both ends by end rings located at both ends of rotor. A field winding comprises a number of pairs of North pole and South pole. There are three full-wave rectifiers. Each of the three full-wave rectifiers converts a phase current of a three phase alternating current supply into a unidirectional current varying with time and delivers the converted current exclusively to a field winding. As a result, poles of the field winding generate fluctuating magnetic flux. A rotor conductor cuts said fluctuating magnetic flux thereby inducing an emf in said rotor conductor and consequently generating current in it. The direction of said magnetic flux and the direction of said current flowing in said rotor conductor are perpendicular to each other. Said rotor conductor moves in a direction perpendicular to both the direction of said magnetic flux and said rotor conductor current thereby rotates the rotor.

The present invention belongs to the technical field of alternating current induction servo motors, and particularly relates to a rotary-type induction servo motor with a constant-output-torque by using uniform magnetic fields and a linear-type induction servo motor with a constant-output-force by using uniform magnetic fields. The present invention has main features that the rotary-type induction servo motor or the linear-type induction servo motor is composed of N independent motor units; each independent motor unit has the same or similar structure, and is powered by single-phase alternating current; and the N independent motor units have an equal voltage magnitude of power supply, but voltage phases are different and form an arithmetic progression. In an independent motor unit of the rotary-type induction servo motor with a constant-output-torque by using uniform magnetic fields, the stator magnetic conductive silicon steel is simple in structure, and the winding manner of stator excitation windings is simple, similar to a multilayer solenoid type; rotor induction excitation windings are powered through induction, and no slip ring and related wearing parts are used. The rotary-type induction servo motor disclosed here can be operated at fixed voltage frequency, and in this case, the output torque and the voltage magnitude of power supply are in direct proportion, so the output torque can be controlled by adjusting the voltage magnitude. The motor does not adopt permanent magnetic materials, and has many merits including simple structure, good torque characteristic, simple controller design and high control precision. And meanwhile, based on the same principle, a linear-type induction servo motor with a constant-output-force by using uniform magnetic fields can be evolved from the rotary-type induction servo motor.

The present invention belongs to the technical field of alternating current induction servo motors, and particularly relates to a rotary-type induction servo motor with a constant-output-torque by using uniform magnetic fields and a linear-type induction servo motor with a constant-output-force by using uniform magnetic fields. The present invention has main features that the rotary-type induction servo motor or the linear-type induction servo motor is composed of N independent motor units; each independent motor unit has the same or similar structure, and is powered by single-phase alternating current; and the N independent motor units have an equal voltage magnitude of power supply, but voltage phases are different and form an arithmetic progression. In an independent motor unit of the rotary-type induction servo motor with a constant-output-torque by using uniform magnetic fields, the stator magnetic conductive silicon steel is simple in structure, and the winding manner of stator excitation windings is simple, similar to a multilayer solenoid type; rotor induction excitation windings are powered through induction, and no slip ring and related wearing parts are used. The rotary-type induction servo motor disclosed here can be operated at fixed voltage frequency, and in this case, the output torque and the voltage magnitude of power supply are in direct proportion, so the output torque can be controlled by adjusting the voltage magnitude. The motor does not adopt permanent magnetic materials, and has many merits including simple structure, good torque characteristic, simple controller design and high control precision. And meanwhile, based on the same principle, a linear-type induction servo motor with a constant-output-force by using uniform magnetic fields can be evolved from the rotary-type induction servo motor.

Provided are a single phase induction motor and a washing machine having the same. The single phase induction motor includes a stator and a rotor rotationally fitted with the stator, the stator includes a stator core and a stator winding disposed on the stator core, the rotor is of a squirrel cage type structure, and the single phase induction motor has two poles, a synchronous speed of 3000 rpm or 3600 rpm, and a rated speed ranging from 2200 rpm to 2800 rpm or ranging from 2600 rpm to 3400 rpm.

An induction motor with on-rotor slip power recovery may have a rotor and a stator element. The rotor element has a rotor winding system with a number of winding units wound-distributed for inducing a rotor magnetic field. Each winding unit has an induction and an augmentation subwinding. The induction subwinding has two legs of each a number of induction conductor segments. The induction subwinding induces an emf that drives a rotor current in the rotor winding system to generate a basic induction component for the rotor magnetic field when the induction conductor segments move in the stator element. The augmentation subwinding has two legs of each a number of augmentation conductor segments aligned parallel to the induction conductor segments. The augmentation subwinding being wound that the two legs of augmentation conductor segments are immediately next to each other and positioned mid-way between the two legs of induction conductor segments.