Abstract: Electric motors are disclosed with coils which induce a magnetic flux field which by its relationship with ferromagnetic poles provide the motoring force without use of an auxiliary magnetic field. The motors may be employed with fixed or pivotably mounted brushes. Pivotable brushes for electric motor brushes are disclosed.

Abstract: A linear drive based on linear motors, for panels, in particular sliding doors, movable along a respective travel path. A linear drive for at least one panel, in particular a sliding door leaf, movable along a travel path, has at least one linear motor for this at least one panel. The linear motor is provided with a stator member and a carriage. Furthermore, the linear drive has a control circuit. The control circuit is adapted to stop the linear motor in the event of failure of power supply to the linear motor, by switching-off the linear motor and operating it as a generator. Thereupon, in terms of its displaceability, this movable panel is enabled by the control circuit. In addition, the linear drive has a switch for switching-off the energy supply to the at least one linear motor.

Abstract: A position sensing system includes a member movable along a path, the member having an elongated magnet extending along the path, the magnetic field orientation of the elongated magnet being at an angle with respect to the path. A sensor determines a position of the member along the path based on a measurement of a magnetic field generated by the elongated magnet.

Abstract: A slip ring apparatus includes a pair of slip rings electrically insulated from each other and disposed coaxially, a pair of electric conductive elements for providing electric connection between the pair of slip rings and a field coil of an automotive alternator, and an insulating member for holding the pair of slip rings and the pair of electric conductive elements. The electric conductive elements have at least one deformation absorbing portion for absorbing a deformation of the electric conductive elements.

Abstract: Apparatus for commutating turns of a stator coil for a helical coil launcher. An annular brush assembly includes an annular support and a plurality of electrical contacts disposed circumferentially about the annular support for contacting the stator coil. A projectile for a helical coil launcher is also disclosed having an armature coil and a body assembly containing at least one annular brush assembly for contacting a stator coil that is slidably engaged with the projectile.

Abstract: The invention relates to electrical engineering, in particular, to devices employed in a step magnetoelectric motor, and it is intended for generating the Sin and Cos of electric signals that uniquely determine an armature position relative to toothed structure of a stator. To increase the accuracy the sensor contains two composite U-shaped magnetic conductors, on pole cores of which the teeth are formed. The group coordinates difference of the teeth being equal to (&agr;±0,5) Z, where &agr; is an integer, Z is the teeth spacing and 0,5 represents the decimal notation of ½. A permanent magnet is connected in series with one of the constituents of U-shaped magnetic conductors, and the magnetic induction converters are placed in proximity to the pair of the like magnetic poles of the magnetic conductors.

Abstract: A rotary absolute signal A is obtained that shows the absolute rotary position at each revolution of the motor based on the output obtained from a rotary encoder 5 affixed to the motor output shaft 2a, and a linear absolute signal B is obtained that shows the absolute linear position per linear stroke pitch along an axial direction 3a of the output shaft 3 based on an output obtained from a linear absolute sensor 6 which is a magnetic induction type sensor and is mounted on the actuator output shaft 3. The distance Lp by which the output shaft 3 is moved per motor revolution and the detection pitch Sp of the linear absolute sensor are set at different values, so in the period until the values become equal, at no point of the output shaft movement is the same absolute signal combination produced. Therefore, the combination of the signals can be used to enable absolute linear position detection over a long stroke.

Abstract: A commutator is disclosed which is adapted to be mounted on a rotor shaft of an electric motor for cooperation with electrical contacts of the motor, the commutator being capable of accommodating two speeds of the motor. The commutator includes a support member formed of electrically insulating material and having a central opening for receiving the rotor shaft, the support member having a surface portion for attachment of commutator segments. A first plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are arranged in a generally circular array and wired to the armature to accommodate at least a first speed of the motor. A second plurality of circumferentially spaced, electrically conductive commutator segments are attached to the surface portion of the support member and are positioned radially outward of the first plurality of spaced commutator segments.

Abstract: An improved method and servo control apparatus (C) is provided for controlling the motion of a linear electric motor (A) which in turn generates motion command signals to various apparatus such as a hydraulic steering system (B). Preferably, the servo control apparatus (C) includes a power supply circuit (60), a servo amplifier circuit (62), a pulse width modulation circuit (64), an H-bridge drive circuit (66) and an inductive position sense circuit (68). The voltage at a node (42) between coil pairs (38, 40) in the motor (A) is sensed and synchronously demodulated using transmission gates (222, 224) to develop a DC signal representative of armature (30) position from a center location. The signal on a current shunt resistor (200) is synchronously demodulated by transmission gates (208, 209)to generate a signal, the phase of which is determined with respect to the motor drive signal. The phase signal directly indicates whether the armature is off center towards drive coil 38 or drive coil 40.

Abstract: A moving-magnet type linear d.c.

Abstract: An image scanning apparatus comprises a recording material supporting member for supporting a recording material in a straightly moveable manner, and an endlessly moveable member positioned close to the recording material supported on the supporting member for movement along straight lines parallel to the recording material at an angle with respect to the movement direction of the recording material. The recording material supporting member is moved at a velocity approximately equal to the velocity component of the endlessly moveable member in the movement direction of the recording material so that the recording material is two-dimensionally scanned by light. The endlessly moveable member is provided with a photodetector and/or a light source. When the apparatus is used for image read-out, the endlessly moveable member is provided with a single light source and a plurality of light receiving elements positioned around the light source.