537results about "Synchronous machines with rotating armatures and stationary magnets" patented technology

Apparatus and methods for providing and controlling a permanent magnet electro-mechanical device that functions as a motor or generator are disclosed. The electro-mechanical device uses control coils to steer magnetic flux of permanent magnets placed between stator segments. The control coils can be wound around the bridge of a stator segment, the poles of a stator segment or both. The electro-mechanical device can be single phase or multi-phase and can include controllers, sensors, a thermal/electrical insulating structure, or a reluctance gap. The stator poles are grouped and designed with an angular spacing that is based on the number of permanent magnets. The electro-mechanical device has a higher power density than conventional motors and generators and operates more efficiently, while operating at cooler temperatures.

The present invention provides miniaturization of brushless motors and brush motors used in electric devices, a ring magnet which simultaneously achieves both high torque and a reduction in cogging torque, a ring magnet with yoke, and a brushless motor. The thin hybrid magnetized ring magnet of the present invention is structured of, in a ring magnet comprised of a plurality of magnetic poles, a radially magnetized main pole and an interface for which the interface of the adjoining main pole is polar anisotropic. When the thin hybrid magnetized ring magnet structured in this manner is applied to a brushless motor, in the case of radial magnetizing, the abrupt change in magnetic flux of the interface between the magnetic poles becomes smooth and cogging torque is greatly reduced due to polar anisotropic magnetization of the interface. At the same time, by polar anisotropically magnetizing the interface between the magnetic poles, magnetic flux is concentrated on the radially magnetized main pole, and in comparison to only radial magnetization, maximum surface magnetic flux improves and it is possible to attain high torque.

A low-ripple multi-phase internal rotor motor has a slotted stator (28) separated by an air gap (39) from a central rotor (36). The rotor has a plurality of permanent magnets (214), preferably neodymium-boron, arranged in pockets (204) formed in a lamination stack (37), thereby defining a plurality of poles (206) separated by respective gaps (210). In a preferred embodiment, the motor is three-phase, with four rotor poles and six stator poles. As a result, when the first and third rotor poles are so aligned, with respect to their opposing stator poles, as to generate a reluctance torque, the second and fourth rotor poles are aligned to generate oppositely phased reluctance torques, so that these torques cancel each other, and essentially no net reluctance torque is exerted on the rotor. In order to magnetically separate the rotor magnets from each other, a hollow space (224, 238) is formed at the interpolar-gap-adjacent end face (216, 218) of each rotor magnet. A control circuit (147) provides electronic commutation and current control, based on rotor position signals generated with the aid of a control magnet (110) on the rotor shaft (40).

The present invention is a system and method for utilizing magnetic energy. The basic principles of the present invention may be implemented in a variety of systems and methods. A magnet may be rotated or an electromagnet may be controlled in order to control a magnetic field generated by a set of magnets. As a result, numerous, substantial benefits may be achieved by providing at least one set of multiple magnets. For example, the present invention may be used in systems and methods to perform a variety of functions including, but not limited to: (1) to control, manipulate, hold, and/or release a load; (2) to open and/or close a pathway; (3) to open and/or close a circuit; (4) to apply a magnetic field to a load and/or to remove a magnetic field from a load; (5) to intermittently apply and remove a magnetic field; (6) to increase the magnetic field that may be applied to a load; (7) to induce a load into motion; (8) to create energy; and (9) to improve the energy efficiency of a device or system.

An electric assisted turbocharger has an electric motor with a stator and a rotor that is coupled to a turbocharger shaft carried by a bearing assembly. The stator has a left-hand winding and a right hand-winding each projecting axially outwardly therefrom. The winds each extend a different distance radially along the motor (and are thus asymmetrical with respect to one another), thereby forming a radial gap along an axial end of the stator. The so-formed stator is disposed within a motor housing and together, the stator and motor housing, facilitate placement center housing axial end therein to minimize turbocharger axial length. The rotor is configured to prevent migration of oil into the motor housing, to improve dynamic balance, and comprises an integral thrust washer for placement against the bearing assembly.

A rotary electrical machine, especially an alternator or an alternator-starter for a motor vehicle, comprises a stator (S), a rotor (R) and permanent magnets incorporated in the rotor and/or the stator, in which the said magnets are formed into at least two groups each of which is defined by a specific type of composition, with each sub-assembly being a combination of a magnet containing rare earths with a ferrite magnet, at least one of the magnets being arranged radially so as to generate an orthoradial magnetic flux.

A stator for an electromagnetic machine includes a plurality of discrete and individually wound stator segments having end caps positioned on the segments. The end caps have legs for positioning the end cap on the segments with an interference fit. The end caps have angled surfaces to facilitate winding of wire on the segments. The end caps have male and female couplings that mate together to couple adjacent segments together. The end caps have fingers and slots for aligning the segments on substantially the same plane. The end caps have wire isolation features, including hooks, shelves and ledges, for separating the interconnect wires routed on the stator to electrically interconnect the segments. The segments include scalloped contours on their outer edges for draining oil, and the end caps have passages for draining oil.

Abstract: A dual rotor type motor of the present invention is disclosed. The dual rotor type motor according to the present invention includes a shaft rotatably provided in a motor securing part; a rotor assembly rotated with a center thereof fastened to the shaft, the rotor assembly comprising an outer rotor spaced apart at a predetermined distance from the center of the shaft with magnets secured along a circumferential direction, and an inner rotor provided in an inside of the outer rotor at a predetermined distance spaced apart with magnets secured along a circumferential direction; and a stator comprising a core made of metal, an insulator of an insulating material for surrounding the core so as to have a first and second surface of the core facing each other to be exposed outside, a coil wound on the outer surface of the insulator, a molding part of insulating material for surrounding the insulator and the coil by insert molding as one body to expose the first and second surface of the core in a state of the insulator being provided in a circular shape and a fixing part for securing the molding part to the motor securing part, and the stator provided between the outer rotor and the inner rotor for having the exposed first and second surface of the core to face each other at a predetermined distance with the magnet of the outer and inner rotor.

There is provided an axial gap type rotating electric machine which is small-sized and achieves a high motor efficiency as a drive source having a high torque using, for example, a strong magnet by reducing an energy loss by an induced current.

An axial gap type rotating electric machine having a yoke on a side of a rotor in a circular plate shape fixed to a rotating shaft, a yoke 23 on a side of a stator in a circular plate shape opposed to the yoke on the side of the rotor, a magnet fixed to a side of an opposed face of either one of the yokes on the side of the rotor or the side of the stator, a plurality of teeth 24 arranged on a side of an opposed face of other yoke on the side of the rotor or the side of the stator radially and opposedly to the magnet and fixed to the yoke 23, and a coil wound around each of the plurality of teeth, in which the teeth 24 has a laminated member of plate members 124 for the teeth and faces 124a to be superposed of the plate members 124 for the teeth are arranged in a circumferential direction.

Disclosed herein is a structure for linear and rotary electric machines. The present invention provides a modular mover structure which includes coils that have an electrical phase difference of 180°, so that the path of magnetic flux is shortened, thus reducing the size of the machine and mitigating the back-EMF unbalance. Furthermore, the modular mover structure can be modified into various shapes. For example, when a skew structure is applied to a mover or stator iron core, the force ripples in an electric machine can be reduced. In addition, when a hinge structure is applied to a modular mover iron core, the mover can move in a linear and curved manner. Moreover, the structure of the present invention can be applied to a rotary electric machine. In this case, because the number of poles can be easily increased, a low speed high torque direct drive type rotary electric machine can be realized.

A direct-current motor includes a stator having a magnetic field system, a rotor disposed around the stator, a commutator which rotates together with the rotor, and power supply brushes which are urged in the axial direction by urging members so as to come into contact with the sliding contact surfaces. The rotor includes an armature core around which armature coils are wound, and a rotary shaft which rotates together with the armature core. The commutator has segments extending radially. The segments have sliding contact surfaces orthogonal to an axial line of the rotary shaft. At least a part of each power supply brush comes into contact with the sliding contact surface at a position further radially outward than the armature coil.

An electric composite rotating machine haveing two rotors, capable of developing mechanical power and of runing on two rotational direction at selfadjutable speeds, of differential type, with 40% increase of output, doubling the torque at 30% reduction of used electrical energy.

A dynamo-electric machine which can function as a motor or a generator. The machine comprising a stator and an armature, and switching of the armature coils is accomplished by means of a switching control assembly which is mounted to, and rotates with, the armature. In operation as a motor, direct current is supplied through brushes to slip rings that rotate with the armature, and the DC current supplied is first passed through switch means in the control assembly to deliver the current in properly timed relationship with respect to the rotation of the rotor. This provides greater versatility in the operation of the motor/generator and eliminates many of the problems related to the use of conventional brush commutation commonly used in present day DC motors and generators.

A permanent magnet element intended especially for electrotechnical devices and an electric machine, the element (1) comprising at least one permanent magnet piece (10). The permanent magnet element (1) also comprises a protective cover (11) that is arranged to partly surround the permanent magnet pieces (10) arranged in the element, and the permanent magnet element (1) also comprises one or more fastening elements (13; 21).