Abstract: An electromagnetic rotating adjuster that has a servomotor with a can-shaped rotor, which is supported by means of a shaft via a first roller bearing and a second roller bearing, in which the disposition of the roller bearings in the one piece housing is inaccessible. For axial fixation of one second roller bearing, a spring washer is disposed in a second bearing opening and the second roller bearing is pressed against it, the outer race of the bearing having a detent groove on its circumference which groove is engaged by resilient detent tongues of a detent ring, supported in an annular groove of the housing. This assures secure fixation of the second roller bearing in the axial direction in a way that both suits the needs of large-scale mass production and is economical. The electromagnetic rotating adjuster may be used in control of the idling air in internal combustion engines. The resilient tongues and washer facilitate removal, as well as installation, of the rotor assembly.
April 29, 1991
Date of Patent:
February 11, 1992
Robert Bosch GmbH
Michael Giesbert, Johannes Meiwes, Friedrich Wendel, Dieter Dick, Henning Teiwes, Helmut Schellhase
Abstract: A series electric motor having at least one field winding on its stator and a rotor fed through a commutator and brushes, and a device for short circuiting the rotor. Between the stator and the rotor there is at least one permanent braking magnet attached to the stator. When the short circuiting device is put into operation, the permanent magnet field to drive the braking current is strictly predetermined so that a braking effect may cause no additional or harmful sparking at the brushes. The entire braking energy is then directly converted in the motor rotor and there is no necessity for an additional electronic regulating device for the braking current.
January 31, 1991
Date of Patent:
February 11, 1992
Axel Behrens, Walter Berwarth, Gerhard Fetzer, Hansjorg Nothdurft
Abstract: The apparatus uses an influence coefficient calculating method to allow a rotor supported on active magnetic bearings to rotate about an inertial axis which, due to possible imbalances in the rotor, may be different from the geometric axis of the rotor, without transmitting imbalance forces to the housing of the active magnetic bearings.
Abstract: An assembly in which a rotating shaft is supported by a magnetic bearing has a back-up bearing to support the shaft in the event of failure of the magnetic bearing, the back-up bearing comprising a first layer of a dry bearing material, and with a surface opposite to a wear-resistant surface portion of a second layer. One layer is provided on a stationary part of the assembly, such as a housing, and the other layer is provided on the shaft. When the coefficient of friction between the first and second layers is either relatively low, or relatively high, heat can be dissipated from the back-up bearing at a low rate; or at a high rate. Heat dissipation may be enhanced by providing fins in good thermal contact with at least one of the two layers of the back-up bearing; and each such layer, advantageously, has a high thermal conductivity.
Abstract: A motor-operated pump of the in-tank type has a driving motor with a commutator; a bracket covering one end of the motor adjacent to the commutator; a brush held against the commutator through a through hole formed in the bracket; an electrical noiseprevention element in a bottomed hole formed in the bracket, and electrically connected to the brush; and a terminal electrically connected to the electrical noiseprevention element. A brush spring-holder plate is fitted in the bracket for holding a brush spring urging the brush. An outer cover is fitted on the bracket for covering the bracket and the brush spring-holder plate.
Abstract: A cooled electric motor comprising a releasable sealing cover element for protecting electrical components, in particular, coil winding heads located in end spaces between opposite end faces of a stator plate pack and respective bearing shields. The cover can be removed for service in cleaner environments.
Abstract: A polyphase induction motor prevents the transmission of excessive torque to the load upon starting of the motor by connecting a pair of friction clutches between the rotor of the motor and the power shaft. When a torque higher than the pressure on the clutches occurs, the clutches will slip, permitting the output shaft to rotate at a lower speed than the rotor. An adjustment varies the pressure of a spring pressing on the clutches to adjust the torque at which slippage of the clutch occurs.
Abstract: A non-contacting linear drive includes a fixed guidance part constructed as a profile part whose magnetic material in the vicinity of helixes (3,4) approaches (8,11,17) the latter and, at a distance from the helixes, forms a return path to the next helix. The rotary part has spaced double helixes, (3,4), a constant magnetic field (7) being produced in the magnetic circuit formed by a double helix and the magnetic return path. A very simple and economic construction and manufacture are consequently possible. The guidance part (2) can be constructed as a profile rail (9) or as a tube (10,15) and has window-like recesses (6), corrugations (11,12) or ribs (17). The double helix (1) can be constructed with permanent magnets (14) placed in the helixes with radial orientation or with permanent magnets (14) provided between soft magnetic helixes in axial orientation.
Abstract: A harmonic traction motor for converting linear motion to rotational motion. A driven shaft is surrounded by the annulus of a shaft driving member having a circumference slightly larger than the circumference of the shaft. At least two actuating devices are connected between the support and the driving member at 90.degree. with respect to each other and sequentially energized to cause the annulus to exert a force around the shaft in a hypocycloidic motion. This motor has high torque, high stiffness, zero backlash and small volume and can be operated in a stepping mode and can be used as a brake or clutch, if desired.
Abstract: An apparatus for generating SH waves comprises a casing, a rotor, stator, a flywheel connected to the rotor and a controller for controlling the rotation of the flywheel. The flywheel is first rotated at a predetermined speed, and then its rotation speed is decreased or increased continuously or intermittently, thereby to generate the SH wave onto an objective solid body.
Abstract: A motor includes a tubular steel frame with a stator unit fixedly mounted therein and spaced from the frame ends. Spaced bearing frames are secured within the tubular frame and support a rotor unit within the stator unit and in the bearing frames. One or both bearing frames are spaced from the tubular frame ends, and define corresponding auxiliary compartments. In a motor pump unit, an end plate closes one end and defines a control compartment. The pump housing closes the opposite end and forms a fan and drip compartment within the frame. The frame has openings in the drip compartment to by-pass pump water leakage from the motor compartment. A fan in the fan compartment provides motor cooling. Motor controls such as power connectors, a centrifugal start switch unit, electronic timers, and the like are mounted within the control compartment to form a self-contained motor.
Abstract: A miniature motor with a revolution-detecting generator, the motor having a stator formed by a permanent magnet on the motor housing and a rotor consisting of a winding on a core. Electric current is fed to the rotor winding via current feeding brushes and a commutator. A revolution-detecting generator comprising a frequency-detecting coil for receiving changes of magnet flux made by teeth on stator and rotor components generates an induced voltage proportional to the revolution of the rotor, in which a noise-suppressing coil wound in a lapped state with the frequency-detecting coil is provided. The noise-suppressing coil and the frequency-detecting coil are connected with each other in a reverse phase, and the noise-suppressing coil is connected in parallel with the frequency-detecting coil via a high-pass filter connected in series.
Abstract: A water drain device of a revolving electric machine, wherein an oil reservoir chamber is formed at a position adjacent a bearing housing chamber in a housing having a rotor housing chamber and the bearing housing chamber, a rotor in the rotor housing chamber is supported by bearings in the bearing housing chambers, and an oil seal in slidable contact with the outer peripheral surface of the rotor is provided at a position adjacent the oil reservoir chamber. In the housing, an oil discharge channel opens in a direction in which gravity drains oil in the oil reservoir chamber out of the housing, a water discharge channel connects the rotor housing chamber and the vicinity of an outlet of the oil discharge channel, and an air vent channel connects the rotor housing chamber to the oil discharge channel through the oil reservoir chamber. A drain cover forming a fluid discharge channel is mounted in the vicinity of the outlet of the oil discharge channel and an outlet of the water discharge channel.
December 5, 1990
Date of Patent:
December 31, 1991
Mitsuba Electric Manufacturing Co., Ltd.
Masayuki Tamura, Hiroyuki Shiina, Yasushi Yoshida
Abstract: A motor for a pump, especially a pump for a drum, barrel, or other tanks or containers. The motor has a housing in which a rotor is surrounded by a stator. The motor is an electronically commutated direct current motor that has no brushes. The switch or control device of the motor is an electronic switch or control device that is accommodated in the housing.
Abstract: A magnetic bearing assembly includes at least one electromagnet with a coil at least partially enclosed by a ferrogmagnetic core. Because of this arrangement, heat, inevitably generated within the coil in a conventional bearing, may cause the temperatures of the coil and adjacent parts of the electromagnet to rise to unacceptable values. These temperatures are reduced by placing a heat conducting member, say of copper, contiguous with the coil, and possibly inserted into the coil. Heat is conducted at a high rate to an exposed portion of the member, and is extracted efficiently therefrom by windage, or air flow, created within the apparatus having the magnetic bearing. Advantageously, the exposed portion of the heat conducting member has an extensive surface.
Abstract: A torque motor for rotatably driving a rate sensor (10, 100) which includes a permanent magnet (30) that is magnetically coupled to an upper rotor (18, 106) and a lower rotor (44, 110). At three sites, the upper rotor includes an upper tab (60), which is centered between two electromagnetic coils (56, 58). Similarly, at each site, the lower rotor includes two lower tabs (62) that extend adjacent opposite faces of the electromagnetic coils. With no electrical current flowing through the electromagnetic coils, flexures (46) that connect the upper and lower rotors to a base (12) provide a spring bias force sufficient to maintain the upper tab centered in a slot (66) and thus, equidistant between each of the two lower tabs. As the electric current flows through the electromagnetic coils, distribution of the magnetic flux produced by the permanent magnet changes so that the upper tab is attracted toward one of the electromagnetic coils and repelled from the other.
Abstract: A dynamoelectric machine (M) has a terminal board (T) on which electrical connections are made by attaching various electrical elements (1, 5) together so, that an electrical connection is made between them. A fastener 13 is used to physically make the attachment. A spacer (25) fits on and is compressed about the fastener to permanently attach the elements and insure that electrical integrity between them is maintained. The elements cannot be subsequently loosened by connection and disconnection of other elements to the board, or by an element rotating relative to the fastener.
Abstract: In a stopping device for a shaft, which acts in all three dimensions and is unaffected by large accelerations, a gear on the shaft of an engine is stopped by a locking pawl which engages the gear when the electromagnet is not excited. A magnetic field generated by the passage of current through a coil produces a torque which turns the rotating armature against the force of a spring in such a way that the locking pawl is moved radially outward around the gear and over a guide pin on the rotating armature which can be moved in a guide slot of the locking pawl, and thereby releases the gear and hence the shaft.
Abstract: A modification of the squirrel cage of an alternating current motor reduces the starting current amperage. A conventional motor squirrel cage, which includes rotor bars and shorting rings, is modified so that the cage may have two or more controllable resistance values by segmenting the shorting rings. A high resistance cage is obtained for initial motor starting when the open segmented shorting rings provide a high resistance path within the squirrel cage circuit. Subsequent to the motor's attaining full rotation speed, a low resistance value of the squirrel cage is achieved by shunting the segmented shorting rings, which gives the motor its optimum running efficiency. In one embodiment, a mechanical means is used to accomplish the shunting of the shorting rings. In a second embodiment, a solid state control device is used to accomplish the shunting of the shorting rings.