Auxiliary Means For Producing Mechanical Starting Or Accelerating Torque Patents (Class 318/136)
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Patent number: 8836267Abstract: A torque detection device includes: a torsion bar that couples a first shaft to a second shaft; a magnet that is fixed to the first shaft; and a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face each other in an axial direction. Each of the magnetic yokes includes a yoke ring and a plurality of lugs that are arranged in a circumferential direction on the corresponding yoke ring. Each yoke ring includes an extending portion that extends radially outward from base portions of the lugs, and a bent portion that is bent in the axial direction from a radially outer end portion of the extending portion. The outer size of the pair of magnetic yokes in the axial direction is larger than or equal to the length of the magnet in the axial direction.Type: GrantFiled: October 30, 2012Date of Patent: September 16, 2014Assignee: JTEKT CorporationInventor: Kaname Aoki
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Patent number: 8680975Abstract: A haptic actuator system and a method of making the same include an ultrasonically vibrating motor body. A shaft is coupled to the vibrating motor body, the shaft arranged to rotate in at least one direction in response to the vibrating motor body. At least one unbalanced mass is coupled to and is moveable with the shaft to generate human-detectable vibrations in response to a motion of the shaft.Type: GrantFiled: March 31, 2010Date of Patent: March 25, 2014Assignee: New Scale TechnologiesInventors: David A. Henderson, Qin Xu
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Patent number: 8378598Abstract: In a polyphase electric motor, a voltage is sequentially applied to a plurality of windings on a phase-by-phase basis. Then, there is sensed a rotational speed of a rotor, which is rotated by a rotating magnetic field that is generated by sequentially flowing an electric current in the windings on the phase-by-phase basis upon the sequential application of the voltage to the windings. Then, an oscillation frequency of a periodic oscillation, which is generated in the motor at the sensed rotational speed of the rotor, is obtained. Thereafter, it is determined whether the obtained oscillation frequency is a predetermined resonance frequency. Next, the voltage to be applied to the windings is corrected in a manner that reduces a resonance generated in the motor when a result of the determination indicates that the obtained oscillation frequency is the predetermined resonance frequency.Type: GrantFiled: January 21, 2010Date of Patent: February 19, 2013Assignee: ASMO Co., Ltd.Inventor: Youichi Kaneko
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Patent number: 6639377Abstract: In order to provide a driving device for a motor having a capability equivalent to conventional vector control type sensorless method by simplifying the controls structure to reduce number of parts to be adjusted, and to stabilize the control system, a driving device for a synchronous motor does not include a speed controller or a current controller, and calculates a voltage impressed on a motor on coordinate axes (dc/qc axes) based on a magnetic pole axis. For calculating a voltage command, command values such as a rotation speed command and a current command are used, and Iq* corresponding to a torque current command is calculated and provided based on a detected current value.Type: GrantFiled: October 22, 2001Date of Patent: October 28, 2003Assignee: Hitachi, Ltd.Inventors: Yoshitaka Iwaji, Tsunehiro Endo, Noriaki Yamada, Hiroshi Fujii, Kiyoshi Sakamoto
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Hand-held, finger or mouth-actuated pneumatic unit for remote proportional control of sewing machine
Patent number: 6118236Abstract: A mouth and/or hand-held finger-actuated remote control unit is disclosed which is operable to permit selective variation of a pneumatic-operated controller (38, 42) having a proportional electrical control output to the electric motor (46) of a sewing machine (48). The unit comprises a hollow, elastic compressible bladder element (10, 110, 210) closed at one end and which is pneumatically connected to the controller. The bladder element is of length, width and height dimensions selected and proportioned to permit insertion of the bladder element in a person's mouth between the upper and lower teeth, or between the last fingers of a person's hand between the innermost knuckles and the person's palm. The bladder element is compressible by closing of a person's teeth thereon or movement of the fingers engaging the bladder toward the individual's palm to force air to the controller, thus controlling operation of the sewing machine.Type: GrantFiled: November 12, 1999Date of Patent: September 12, 2000Assignee: Bed Handles, Inc.Inventors: Bon F. Shaw, Juliann P. Shaw -
Patent number: 4812691Abstract: The invention relates to a device for improving the stability of rotation of the rotor of a single-phase synchronous motor mounted in an apparatus housing. The motor exhibits an average motor torque on which strong alternating torques are superimposed and which drives a preferably rotating load. The rotating load may be a small domestic appliance such as a citrus-juice extractor, a knife sharpener, or a dry-shaver with rotatary cutters.Type: GrantFiled: April 16, 1987Date of Patent: March 14, 1989Assignee: U.S. Philips Corp.Inventors: Leo Bertram, Hugo Schemmann, Gerhard Diefenbach
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Patent number: 4809254Abstract: It is conventional in relation to automatic retraction mechanisms to position a switch that advances a slide-out compartment in and out either on the front surface of the compartment or behind it at a fixed point inside the device where it can be activated by the compartment, which the operator applies pressure over a short distance to for that purpose. The object of the invention is accordingly to provide a reliable, cost-effective, and user-friendly solution.This object is attained with absolutely already existing components in that the retraction mechanism travels a short distance when pressed, accordingly rotating the rotor component of the motor (1) through the intermediary of the drive mechanism, a rack (3) and pinion (2) and if necessary a belt (4) for example, and causing it to generate electromagnetic force. The resulting pulse is processed in the form of a signal by a simple processing circuit (17) and supplied in the form of a switching command to controls, usually a microcomputer (18).Type: GrantFiled: January 7, 1988Date of Patent: February 28, 1989Assignee: Deutsche Thomson-Brandt GmbHInventor: Wilfried Scheffler
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Patent number: 4740733Abstract: An autosynchronous motor comprises a control and power circuit for the windings of a stator generating a rotating field the angular direction of which is a function of the magnetizing direction of the permanent magnet of the rotor, and to a positioning device producing a signal representing the angular position of the rotor relative to the stator windings. This positioning device emits one pulse per rotation; it comprises a moveable member integral with the rotor and a steady or fixed member integral with the stator.The stator member of the positioning device and the stator comprise complementary means so that this stator member can, by manual operation, be rotated around the axis of the motor. Marking references are provided for predetermined angular positions of the stator member. These complementary means are, for example, on the stator constituted by a ball repelled by a spring and on the stator member by a number of notches equal to the number of pairs of the rotor.Type: GrantFiled: February 19, 1986Date of Patent: April 26, 1988Assignee: AuxilecInventor: Michel Epars
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Patent number: 4707644Abstract: A fluid-powered auxiliary starting system for electric motors is disclosed which includes an accumulator means for supplying an amount of fluid at high pressure to a fluid-operated motor and a clutch of similar device for connecting the output shaft of the fluid-operated motor to transfer rotational torque to the shaft of the prime mover motor to be started. The system may be either hydraulic or pneumatic and may be used to bring one or more electric motors substantially up to spaced before electric power is applied to the motors themselves. The same motor or a hydraulic or pneumatic pump may be used to recharge the accumulator between uses for electric motor starting.Type: GrantFiled: May 11, 1981Date of Patent: November 17, 1987Assignee: Honeywell Inc.Inventors: John W. Miller, Melvin F. Mittelmark, Roger N. Schmidt
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Patent number: 4678972Abstract: The stator winding of a single-phase brushless DC motor with symmetrical rotor and stator air gap geometry is comprised of two serially connected relatively displaced sections energized with a source of direct current in accordance with the rotary position of the motor rotor. In the run mode, the full winding is energized; in the start mode, one of the sections is momentarily short-circuited if the initial winding energization fails to produce sufficient torque for starting.Type: GrantFiled: September 18, 1986Date of Patent: July 7, 1987Assignee: General Motors CorporationInventors: Richard N. Lehnhoff, Jack W. Savage
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Patent number: 4673849Abstract: A closed loop drive system for a permanent magnet motor (12) operable in a two-phase drive mode during a start cycle and a single phase drive mode thereafter during which the start cycle is reinitiated if the back EMF generated in a sensing winding (18) falls below a reference value. The permanent magnet motor (12) is driven as a two-phase motor with an increasing frequency input during the starting cycle and after initial starting is driven as a single phase motor as long as the back EMF induced in a stator sensing winding (18) remains above a predetermined value. A restart decision circuit (20) is provided which samples the back EMF induced into the stator winding (18) not being driven during single phase operation and initiates a restart cycle if the induced back EMF during single phase operation falls below a selected reference.Type: GrantFiled: October 10, 1986Date of Patent: June 16, 1987Assignee: Allied CorporationInventors: Jerome Sears, Walter Parfomak, Walter Kluss
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Patent number: 4545117Abstract: A linear stepper motor comprising a stator bar having stator teeth and a slider having slider teeth. The slider is positioned under the stator bar. The surface of the stator bar opposed to the slider has a pair of flat portions with a predetermined width between the edges and the teeth. The flat portions serve as rail portions for the rollers mounted on the slider. On the surface of the stator bar extending between the pair of flat portions are formed a plurality of parallel grooves to provide a plurality of stator teeth. The surface of thes stator bar is hardened by plating with a metallic material.Type: GrantFiled: April 22, 1983Date of Patent: October 8, 1985Assignee: Brother Kogyo Kabushiki KaishaInventor: Takachiyo Okamoto
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Patent number: 4037122Abstract: A linear actuator comprises a toothed magnetic motor bar and a motor element having a pair of E-cores on opposite sides of the motor bar. Rollers attached directly to the E-cores ride on the motor bar to maintain a fixed air gap between the motor bar and the pole faces of the E-cores. The E-cores are connected by I-shaped connector plates to hold the tooth relationship between E-cores. The connector plates also are flexible to compensate for variations in thickness of the motor bar.Type: GrantFiled: June 1, 1976Date of Patent: July 19, 1977Assignee: International Business Machines CorporationInventors: Gilbert Belmont Bonner, Joseph Leo Dessel