Abstract: Ceramics material are not resistant to tensile force, though they are resistant to compression force. Therefore, ceramics materials, when used as the material of a commutator of an electric rotary machine, tends to be cracked and broken due to tensile stress generated in the inner peripheral portion of the commutator when the latter is press-fitted on the rotor shaft of the machine. The invention is aimed at obviating the above-described problem, so as to make it possible to produce a sliding current collector of an electric rotary machine from a ceramics material. To this end, according to the invention, an annular gap is formed between the inner peripheral surface of the ceramics commutator and the other peripheral surface of the rotary shaft and the gap is filled with a resin such as a thermosetting resin which is then thermally set to form a resin layer by which the commutator is bonded to the rotor shaft.

Abstract: A novel DC rotary electric machine of permanent magnet field type is disclosed, in which a plurality of permanent field magnets having an auxiliary pole of magnetic material are arranged alternately with a plurality of field magnets including only a magnetic material along the peripheral direction. The field magnets with the auxiliary poles are arranged adjacently with the field magnets of magnetic material with through bolts extending therebetween.

Abstract: A permanent magnet field type DC machine in which the amount of flux from field poles is changed by effective use of armature reaction thereby to improve characteristics of the DC machine. There is provided a permanent magnet field type DC machine having field poles formed of permanent magnet members and auxiliary magnetic pole members of high permeability which are provided in parallel with each other in the direction of rotation on the peripheral surface of a yoke to oppose an armature with an air gap therebetween, the auxiliary magnetic pole members being magnetized by armature reaction thereby to change the total amount of field magnetic flux from the field poles, wherein the gap between the auxiliary magnetic pole members and armature is selected to be smaller than that between the permanent magnet members and armature, thereby decreasing the reluctances in the paths of the auxiliary magnetic pole members, so that the armature reaction can be effectively used.

Abstract: A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.

Abstract: A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.

Abstract: An electric power steering apparatus for a vehicle comprises a steering shaft, an electric motor operable to generate an auxiliary steering force having a magnitude corresponding to a value of electric current supplied thereto, a steering toque sensor for detecting a steering torque applied to the steering shaft, a vehicle weight sensor for detecting a vehicle weight, and a control device. The control device is constituted to increase and decrease the value of electric current to be supplied to the electric motor in accordance with not only the increase and decrease of the value detected by the steering torque sensor but also the increase and decrease of the value detected by the vehicle weight sensor.

Abstract: An electric power steering control system includes an electric motor for producing an assisting torque for the vehicle steering system through a reduction gear, a steering torque sensor fitted on the steering shaft, a controller for controlling the input to the motor in accordance with the torque sensor output, a battery for supplying power to the controller, and a voltage step-up circuit connected to the battery for driving the motor at a voltage higher than the battery voltage. The controller drives the motor at a high voltage.

Abstract: A vehicle height control apparatus responsive to power steering operation is disclosed in which a torque signal indicative of the steering torque imparted to the steering wheel by a driver's operation thereof is used for controlling the power steering system and also for controlling the operation of actuators for adjusting damping force of shock absorber provided to each wheel thereby controlling the height of the vehicle.

Abstract: A DC electric motor which comprises: a reversibly rotatable rotor having an armature core, an armature winding and a commutator; a stator having a yoke and a plurality of field poles provided on an inner circumference of the yoke and each having a permanent magnet and an auxiliary pole; and brush means including a plurality of brushes arranged to be slidably electrically conductively in contact with the commutator; in which the auxiliary pole of each of the field poles is disposed at an exit side of the field pole in the normal foward rotating direction of the rotor; each of the brushes is held movably between a first position corresponding to a position near a geometrically neutral point between a pair of adjacent field poles and a second position corresponding to a position separated at the maximum by an electrical angle of 90 degrees from the geometrically neutral point reversely to the normal rotating direction, and each of the brushes is fixed in the vicinity of the second position in normal use.

Abstract: A permanent magnet field DC machine comprises a rotor and a stator. The rotor comprises an armature core (3), an armature winding (4), and a commutator (2). The stator comprises a yoke (7), permanent magnets (8) disposed on the inner periphery of the yoke (7), and magnetic pole pieces (9) interposed between the yoke (7) and a portion of each magnetic pole (8). The magnetic pole pieces (8) are made of a material the permeability of which is greater than that of the permanent magnets.

Abstract: Disclosed is a method of manufacturing an electromagnetic member having properties of magnetic anisotropy as well as electrical conductivity, comprising the steps of coating an outer circumferential surface of each of a plurality of magnetic strips with a first electrically conductive material to a predetermined thickness to thereby form a plurality of composite magnetic strips, binding the plurality of composite magnetic strips, and filling spaces among the plurality of composite magnetic strips in the bundle with a second electrically conductive material substantially the same as the first electrically conductive material. By this method, a mechanically strong electromagnetic member can be obtained in which adjusting the thickness of the first electrically conductive material, the ratio between the magnetic property and the electrically conductive property can be easily adjusted by adjusting the thickness of the first electrically conductive material and blow-holes can be prevented from being generated.

Abstract: A miniature electric rotating machine has a stator equipped with a field pole on a peripheral circle of a rotor, and the field pole is constituted by a permanent magnet. Each permanent magnet of a miniature electric rotating machine of this type can be divided into a magnetizing side and a demagnetizing side with respect to armature reaction. In the permanent magnet of the present invention, an end portion on the demagnetizing side, which has directivity different from the magnetizing directions on the magnetizing and demagnetizing sides, is disposed adjacent to the portion on the demagnetizing side.

Abstract: A direct-current machine having a rotor which includes a commutator, an armature core and an armature winding and is sustained rotatably in a field system constituted by a cylindrical housing and permanent magnets disposed inside the same. A demagnetizing force of an armature reaction due to an armature current is reduced by attaching a magnetic plate made of high saturation magnetic flux density material to a part of the pole-face of said field system of permanent magnets which is in the demagnetizing field.

Abstract: A flat armature is manufactured by forming a given number of coils over a separatable winding frame, fixing their relative positions by putting adhesive tapes across the coils on the frame, removing the coils from the frame, arranging a group of coils on a plane so that it will form a ring configuration, equipping the coils with a commutator, and moulding the coils equipped with the commutator with resin.