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7626291 |
Drive apparatus
A drive apparatus having a shortened axial dimension. First and second magnets are each formed into a semi-cylindrical shape and each provided with a magnetized pattern portion. A rotor yoke...
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7608972 |
Claw-pole motor having smaller intervals between induction poles of stator rings at both ends
A claw-pole motor includes a rotor having permanent magnets; and a stator having stator rings assigned to three phases, which are coaxially stacked along the same axis. Winding attachment portions...
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7605517 |
Claw pole rotating electric machine
A claw pole type rotating electric machine includes first and second claw cores which are disposed on a ring shaped ring yoke portion and a plurality of claw magnetic poles which extend in the...
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7605501 |
Stepping motor and fan having the same
A stepping motor includes: a stator including a coil that is wound so as to form a hollow space; a rotor including a magnet to be disposed in the hollow space of the coil, the rotor being...
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7599615 |
Motor structure with built-in lens
A motor structure with a built-in lens includes a lens mount ( 10 ), a motor ( 30 ) received in the lens mount, and a lens unit ( 50 ) received in the lens mount and driven by the motor to...
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7598633 |
AC motor designed to ensure high efficiency in operation
An ac motor is provided which includes a plurality of looped windings each of which extends in a circumferential direction of a stator. The stator is equipped with N stator pole groups made up of...
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7592728 |
Electric machine having segmented stator
An electric machine, such as a brushless direct current motor, includes a number of stator formed as stator sections. The stator sections are longitudinally offset from each other along a common...
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7592725 |
Motor and manufacturing method therefor
A motor includes a motor case having an opening part and a stator core disposed in an inside of the motor case. The motor case may include a bottom face part, sidewall parts extended on the opening...
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7589440 |
Stepping motor
A stepping motor includes: a stator having main magnetic poles each having small stator teeth on its tip, a core-back portion that connects outer portions of the poles, and windings wound around...
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7586229 |
Continuous rotary motor
A motor includes a ferromagnetic member with first and second portions, a conductive wire wrapped around the first portions of the ferromagnetic member, and at least one magnet rotatably coupled to...
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7586221 |
Low vibration hybrid step motor
A hybrid step motor has axially spaced first and second sets of rotor sections (or alternatively different sets of stator sections) characterized by different tooth widths. The rotor/stator tooth...
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7582995 |
Stepping motor, lens device using the same, and imaging device using the same
A stepping motor comprises first to third coil portions and first to second rotors. The first rotor has a cylindrical shape and a circumferential surface thereof is magnetically-polarized so as to...
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7579743 |
Magnet rotor, movable magnet-type instrument with the magnet rotor, and stepping motor with the magnet rotor
A magnet rotor in which rotation prevention and positional displacement (rattling, and misalignment of axes) between a magnet and a rotor body can be restricted, a movable magnet type-instrument...
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7573172 |
Magnetic drive apparatus
A magnetic drive apparatus, which has a rotor; and a stator having a stator magnetic flux generator, and a stator magnetic guidepath for guiding magnetic flux from the stator magnetic flux...
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7573164 |
Driving apparatus
A driving apparatus includes a first magnet, second magnet, stator, first coil, second coil, first bearing, second bearing and rotor. The first and second magnets respectively have a magnetized...
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7569953 |
Rotor for hybrid type stepping motor and manufacturing method thereof
Depressed portions for being fitted with two rotor collars 51, 52 are formed in two rotor stacks 72, 71 opposed to each other in an axial direction of the rotating shaft 1 with the rotor...
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7560836 |
Driving device and light amount adjusting device
A light amount adjusting device mounted with a driving device which can have a reduced size in the direction of thickness. In this controller, a magnet is formed into a hollow circular disk shape...
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7538460 |
Integrated resolver for high pole count motors
An AC synchronous motor, also known as a stepper motor, uses its magnetics and drive coils to produce both motion and excitation for sets of position sensing coils. Each drive phase is equipped...
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7535141 |
Motor with thrust bearing holder
A motor includes a stator having a stator core, a rotor, a case, and a bearing. The motor may further include a bearing hold member provided with a through hole into which the bearing is inserted...
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7528515 |
Small DC motor
A small DC motor includes a motor frame having a cylindrical portion, the cylindrical portion having a constant thickness and having a cross section in a shape that comprises four sides and...
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7518277 |
Electric motor
The vibration and noise excited by the electromagnetic exciting force in the radial direction of an electric motor are suppressed. In an electric motor 100 , a rotor 1 is divided into four...
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7518270 |
Accurate microstepping motor
A stepper motor includes a rotor having equally spaced rotor teeth defining a full step angle, and a stator with stator poles wound with coils that can be driven in a series of phases so as to...
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7511391 |
Electromagnetic actuator
An electromagnetic actuator has a rotor and a stator around which coils are wound to face portions of an outer surface of the rotor. The stator is C-shaped, the rotor is arranged so that a rotation...
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7508108 |
AC motor
A brushless AC motor has a rotor, N stator pole group, and plural loop-configuration stator windings. The rotor has magnetic poles with alternating N poles and S poles circumferentially disposed at...
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7479721 |
Motor
A motor includes a rotor part having a rotor shaft and a rotor magnet, a stator part oppositely disposed to the rotor magnet via a gap space, a bearing rotatably supporting the rotor shaft, a...
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7466057 |
Claw pole motor stator
2m sets (m being a natural number of 2 or more; and m=2 in embodiments) of teeth ( 31 b to 34 b ) and 2m−1 slots ( 41, 42, 43 ) are disposed alternately in an axial direction; those of windings...
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7462969 |
Electromagnetic actuator with external coils
An electromagnetic actuator with a smaller size and an increased strength is provided. In the electromagnetic actuator, a first arm portion and a second arm portion that connect the magnetic poles...
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7459822 |
Rotating electric machine having switched or variable reluctance with flux transverse to the axis of rotation
An electric machine, such as a switched reluctance motor (SRM), having one or more transverse flux axes is described. The rotor and stator of the electric machine have more than one phase, not...
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7459813 |
Magnet rotor and electromagnetically-driving device using the same, and optical apparatus with light quantity-control device
An electromagnetic device includes a magnet rotor having a rotary shaft and a stator having an excitation coil configured to apply a rotation force to the rotor. The magnet rotor includes a hollow...
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7449805 |
Stepping motor and electronic apparatus
A stepping motor includes a rotor having a cylindrical permanent magnet, ring-shaped first and second yoke units that are arranged so as to be mutually stacked along an axis of the rotor, and a...
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7446443 |
Electromagnetic-driving device and light quantity-control device incorporating the same
An electromagnetically-driving device has a rotor with a hollow, cylindrical permanent magnet; an inside yoke on an internal circumference side of the rotor; an outside yoke on an external...
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7446442 |
Stepping motor and drive device
A stepping motor includes a rotatable cylindrical magnet circumferentially divided to be alternately magnetized with different magnetic poles, a first coil and a second coil disposed in positions...
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7446441 |
Outer rotor type hybrid stepping motor
An outer rotor type hybrid stepping motor including a stator, a rotor, a magnet disposed axially in either the stator or rotor, a stator core disposed inward from a gap formed between the stator...
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7443642 |
Electric motor control
A method and apparatus is disclosed for controlling a system comprising at least one electric motor. The system includes aspects which permit, among other things, electromagnetically disconnecting...
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7443061 |
Driving device
A driving device which is capable of delivering higher power and can be reduced in size. A hollow-cylindrical magnet ( 1 ) is magnetized so as to have circumferentially alternately different poles....
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7436090 |
Direct drive hybrid rotary motor
A rotary motor shaft extends through a rheological brake unit through which variable braking resistance to rotation of the motor shaft is applied while it undergoes rotation in response to torque...
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7420303 |
Motor
A motor includes a bearing receiving the shaft end of a rotor. a bearing holder provided with a through hole into which the bearing is inserted, a spring member which is disposed on one end side of...
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7414340 |
Motor
A motor may include a rotor provided with a permanent magnet, a stator whose inner peripheral face faces an outer peripheral face of the permanent magnet, a first radial bearing fixed to an end...
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7411322 |
Micromachined reluctance motor
A reluctance motor having a movable part that does not need a fixed mounting shaft in the motor's stationary part. In one embodiment, a motor of the invention has a stationary part that defines a...
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7385321 |
Motor having shifted teeth of pressed powder construction
A multi-polar rotary machine comprises a cylindrical outer rotor arranged concentrically with the stator and with an air gap therebetween. The stator has two spaced stator elements and a ring...
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7385320 |
Step motor
A step motor includes a rotor having four magnetic poles, a first magnetic pole magnetically excited by a first coil, a second magnetic pole magnetically excited by a second coil, and a third...
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7378768 |
Stepping motor and method of manufacturing the same
An object of the present invention is to provide a stepping motor capable of reducing the number of components and the number of assembling steps, and its manufacturing method. In order to achieve...
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7375446 |
Actuator including rotor case and housing with sealing unit for hermetic structure
An actuator for use with a fluid channel structure comprises: a stator assembly including stator yokes, and a coil; and a rotor assembly including a housing shaped in a circular hollow-cylinder, an...
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7372179 |
Stepper motor having solenoid coils around end portions of stator poles
A stepper motor includes a rotor having a ring-shaped body having a circumference along which a plurality of magnetic poles of alternates. A plurality of stator members is arranged along and spaced...
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7358632 |
Motor which performs a rotational-to-linear motion conversion
A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in...
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7358629 |
Electromagnetic actuator
The rotational torque of an electromagnetic actuator having a stator and rotor, such as a stepping motor, is increased. The electromagnetic actuator includes a rotor ( 30 ) having multiple...
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7352089 |
Driving apparatus
A driving apparatus includes a stepping motor having a lead screw, a rack, and a rack-retaining bar, a barrel, a barrel-retaining bar, and a connecting spring for connecting the rack to the barrel....
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7348698 |
Actuator for operating a transmission control valve of an automatic transmission apparatus
A rotor having magnets composed of rare-earth magnets is rotatably disposed inside an exterior casing, a penetrating aperture is disposed through a first end of the exterior casing relative to a...
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7348696 |
Stepping motor
A stepping motor comprises a stator core, a drive coil which is attached to the stator core and a terminal block having a plurality of terminal pins to be wound with the terminals of the drive coil...
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7342330 |
Hybrid type double three-phase electric rotating machine
A stator core having twelve stator poles, coils wound around the stator poles, and a hybrid type rotor are included. The stator poles inwardly and radially extended from an annular yoke portion....
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