Abstract: The force motor of the present invention controls the local magnetic field through a uniquely designed mechanical structure of the internal components. The mechanical structure divides the magnetic field in the force motor into three sections. The force produced on the armature by the magnetic field in the first section increases exponentially as the armature approaches the housing. The force produced on the armature by the magnetic field in the second and the third sections, as the armature approaches the housing, counter balances the rise in the force due to the magnetic field in the first section. Thus, a flat F-S curve over a long stroke length is obtained.

Abstract: An electric rotating machine capable of lowering the temperature of a rotor disposed, wherein at least one of closed ventilation loops for cooling is formed, one of the loops constituting a ventilation passage communicating with an exhaust side through a heat source of the end of the generator to a cooler, thereby to supply cooling wind to the rotor after it passes through the cooler.

Abstract: The apparatus for converting side-to-side to rotational motion for a workpiece includes a spring assembly with a movable base mounting element which is driven in a slightly arcuate reciprocal side-to-side motion and a fixed mounting element spaced apart from the base element and mounted in the appliance so that it does not rotate or move in operation of the apparatus. A spring member, such as two planar leaf springs positioned at an angle to each other, is mounted between the movable base element and the fixed mounting element. A drive shaft member extends from the movable base element through the fixed mounting element and beyond. A workpiece such as a brushhead is mounted on the distal end of the drive shaft. The spring member is configured so that it is substantially less resistant to twisting action than bending action, such that the side-to-side motion of the base element results in rotation of the workpiece.

Abstract: An electrical actuator has a DC motor which is provided with a rotor having a permanent magnet for forming a plurality of magnetic poles around a periphery thereof and a stator having a plurality of energizing coils and being disposed around a periphery of the rotor to thereby generate a rotary force for the rotor. In mounting this DC motor on a heat-generating member which generates radiant heat, a member for shielding radiant heat from a heat-generating member is disposed between the DC motor and the heat generating member. In this manner, the radiant heat from the heat-generating member is prevented from reaching the DC motor, whereby the problems in the DC motor associated with the radiant heat can be prevented.

Abstract: The disclosure describes a DC motor including a rotor unit arranged within the motor body and has a cylindrical field magnet fixed to an outer surface of a holder. The holder has a rotating shaft press-fitted through the center, and the cylindrical field magnet has the S and the N poles alternately around a circumference. There is a stator unit which is circumferentially arranged around the rotor unit, that is made of a plurality of stator yokes that are arranged so that they oppose the field magnet through a small gap. Each of the stator yokes is formed by circumferentially stacking a large number of thin plates, each consisting of a salient pole, and a number of coil units, each formed by winding a magnet wire on a bobbin, and mounting the bobbins on the stator yokes. In the described arrangement, each of the S and N poles has a plurality of stages formed in an axial direction and shifted from each other in the circumferential direction by a predetermined shift amount with respect to the field magnet.

Abstract: A brushless motor includes a highly reliable thrust-receiving member that simplifies the machining and assembling of parts and prevents deformation of the bearing and leakage of lubricating oil. A stator base has a cylindrical portion serving as a base portion of a bearing housing of the motor. The cylindrical portion is integral with the stator base. A sleeve bearing is pressed in and mounted in a fixed condition on the inner side of the cylindrical portion. A stator core consisting of a conductive wire is mounted in a fixed condition on the outer side of the cylindrical portion, thereby forming a stator. A thrust-receiving portion for the rotary shaft is molded integrally with the stator base at the opening of the cylindrical portion by outsert and resin integral molding, this thrust-receiving portion serving to receive the end of the rotary shaft opposite to the output end thereof.

Abstract: An apparatus for converting vibration energy into electric power is provided, in which vibration of a power source is transmitted to a power-generating coil 14, and is then transmitted to an iron core 20 via helical compression springs 26 and 28, thereby causing relative movement between the iron core 20 and the power-generating coil 14 due to inertia, resulting in a change in the magnetic field. An electromotive force is thus generated due to electromagnetic induction, thereby causing a current to flow to an electric wire material 18. Specifically, use of vibration of the power source as energy for power generation can achieve efficient use of energy. The acquisition of electric energy by the power generation may also lead to mitigation of the vibration.

Abstract: In an electrical compressor having a motor and an electrical circuit integrated with a compression portion, a part of electrical components of the electrical circuit is disposed in spaces between a cylindrical outer surface of a motor housing and an imaginary flat surface that imaginarily contacts the cylindrical outer surface. Therefore, the spaces can be used effectively, and the electrical compressor can be downsized. Further, the part of the electrical components can be effectively cooled by refrigerant in the motor housing. On the other hand, the outer surface of the motor housing is used as one surface defining an inner space of a casing for accommodating the electrical circuit. In this case, the electrical circuit can be effectively cooled by refrigerant in the motor housing.

Abstract: An armature of the prior art has a lamination packet which leads to a high loss of magnetic flux in the lamination, since it completely encloses the magnets that are disposed in the lamination. An armature (1) of the invention comprises at least one lamination (1) that only partly encloses the magnets (24). Losses in the magnetic flux are thus reduced.

Abstract: An electrical generating system includes an electric motor coupled to a variable power source. A variable coupling is connected to an output shaft of the motor. The variable coupling includes opposed first and second plates each having permanent magnets affixed thereto and arranged such that rotation of the first plate by the motor causes the second plate to rotate by repulsive magnetic force. A switching mechanism adjusts the variable coupling. A gear assembly having a high transmission ratio is connected to the variable coupling. Preferably, at least one electrical generator is connected to the gear assembly for generating electricity.

Abstract: A rotary transformer has a bus duct assembly that extends through the hollow shaft of a rotary transformer from collector or slip rings positioned above a drive motor for the rotary transformer to end windings of the rotor positioned most remote from the drive motor. By positioning the leads of the bus duct connection with the rotor end windings on the rotor end windings most remote form the drive motor, the shaft strength and integrity is not reduced due to the torque applied by the drive motor. Further, the shaft is formed from two coupled shaft sections and the bus duct assembly comprises two L shaped sections each positioned substantially within a corresponding shaft section. The bus duct sections are interconnected to complete the bus duct assembly making it simpler to remove the first or upper shaft section from the second or lower shaft section during field servicing.

Abstract: A polyphase sequentially joined-segment coil of a rotary electric machine and a production method thereof are provided. The coil is made up of a plurality of conductor segments joined in series. Each of the conductor segments a head projecting from a stator core, a pair of legs, and a pair of ends projecting from the stator core. The heads are of two types: a large-sized head and a small-sized head extending inside the large-sized head. This structure permits the length of the conductor segments in an axial direction of the core to be decreased and improves cooling capability of the machine and coil losses.

Abstract: A system and method for reducing the cost of producing a brushless DC motor is presented. The brushless DC motor provides higher power density and efficiency with an increased tool run time. The brushless DC motor includes a rotor assembly that has an unmagnetized permanent magnet affixed to a shaft. The permanent magnet remains unmagnetized until the motor is partially assembled. A plurality of coils for producing a magnetic field are wound about the rotor assembly. The coils include end turns that enclose the rotor assembly such that the rotor assembly is not removable. Since the windings are wound with the rotor assembly already enclosed, the windings do not require large end coils to allow subsequent insertion of the rotor. Minimizing the end coils reduces the length of wire required per turn, thereby reducing the resistance of the winding.

Abstract: In the embodiments described in the specification, an electric motor has a stator and a rotor and a wrap layer includes composite lamina arrangement containing a liquid barrier with a veil cloth and a chopped strand mat resin layer, a strength element containing a hoop wrap including a polymeric resin layer with continuous fibers extending circumferentially around the rotor and another polymeric resin layer with fibers extending helically, a liquid barrier having a veil cloth and a chopped strand mat resin layer and another strength element including a polymeric resin layer with continuous fibers extending circumferentially around the rotor. The outer surface of the composite lamina arrangement may be corrugated to promote or inhibit flow of liquid through the space between the stator and the rotor.

Abstract: The centrifugal weight control is a means of regulating rpm's on the low speed shaft in a changing wind (or water) speed. As wind speed increases the weights are extended farther from their hub. This extension as wind speed increases does bring into play a greater inertial force. It is this greater inertial force that holds rpm's constant and, at the same time, increases rolling torque on the low speed shaft. With sufficient increase in rolling torque additional generators can be clutched into operation. Common knowledge in the business is that the energy content of the wind increases eight fold with each doubling of wind speed.

Abstract: A rotor assembly for an electric motor having a rotor shaft and at least one permanent magnet arranged on the rotor shaft. The rotor shaft with the permanent magnet is accommodated in a sleeve the rotor shaft being freely rotatable within the sleeve. The sleeve is closed off by a flange at a first end face. An inner-rotor electric motor having a stator and a rotor assembly of the type described above, with the stator being inserted over the sleeve of the rotor assembly.

Abstract: Disclosed are a unit core and a method manufacturing the same. The unit core is opposite to the neighboring unit core on an electric steel plate in orientation, and its unit yoke has an elongated end extending from a central line connecting a center of a tooth to a center of a core formed by interconnecting a plurality of the unit cores, to be opposite to the elongated end of the unit yoke of the neighboring unit core in orientation. This arrangement of the unit cores on the electric steel plate reduces a size of a scrap remaining after the unit cores are punched from the electric steel plate, thereby reducing the production cost of the unit core.

Abstract: A brush box assembly for use in an electric motor and an electric motor having a brush biasing mechanism that also retains the brushes to allow installation of a sliding electrical contact assembly is described. The brush box assembly has a plurality of brush holders each with a brush retention slot, a plurality of brushes each adapted to fit in the brush retention slots, the brushes having a contact face and a non-contact face, and a plurality of torsion springs each having a spring loading arm and a spring retention arm, each spring loading arm contacting one brush on the non-contact face and adapted to bias the brush against a sliding electrical contact after installation of the sliding electrical contact assembly, each spring retention arm adapted to contact one brush on the front side and retain the brush in the brush retention slot during installation of the sliding electrical contact assembly. A method of manufacture of a device having brushes with the biasing and retention mechanism is also disclosed.

Abstract: An electric machine selectively operates as a generator mode or a motor mode. The electric machine includes a stator core, a multi-phase armature winding, a field coil, a moving core having a plurality of salient poles so as to move relative to the stator core to cross the magnetic field. Field current is supplied to the field coil differently according to operation mode. A portion of the armature winding is short-circuited to form an additional magnetic field that has a phase different from the magnetic field of the field coil. Therefore, the rotary core moves relative to the stator core when the operation mode is in the motor mode.

Abstract: In an electrical machine, in particular a generator for a motor vehicle, having a housing (2), a rotor (6), supported rotatably in the housing (2) about a pivot axis (5), at least one fan wheel (20), connected to the rotor (6), for generating a cooling air flow (22, 22?, 22?) from at least one intake opening (37; 37?; 37?) disposed in the housing (2) to at least one outlet opening (24) disposed in the housing (2), and at least one regulator chip (31), disposed on a chip holder (30), for regulating the current generation, it is provided that the chip holder (30) is disposed such that it is bathed at least in part directly by the cooling air flow (22, 22?, 22?). As a result of this arrangement, it is attained that a very high heat transfer coefficient is present, because of the high flow speed of the cooling air flow (22, 22?, 22?).