Patent application number | Description | Published |
20080278010 | Switched reluctance motor - A switched reluctance motor has a rotor and a stator. The stator has first and second stator magnetic pole groups sequentially placed in an axial direction of the rotor. First and second stator magnetic poles in each group are alternately arranged on a same circumference. The first stator magnetic poles are placed every electrical angle | 11-13-2008 |
20080290754 | AC Motor - The motor includes a rotor including N-pole magnets and S-pole magnets located alternately along a circumferential direction of said AC motor, a stator core including a plurality of partial cores arranged coaxially along an axial direction of said AC motor each of said partial cores including a plurality of stator poles located along said circumferential direction so as to be on the same circumference, and a plurality of loop-like windings each of which extends in said circumferential direction while passing through, in said axial direction, interpole spaces between each two adjacent stator poles in said circumferential direction. The a phase angle difference between each adjacent two of said stator poles in said circumferential direction of the same one of said partial cores is set at a value smaller than 360 degrees for each of said partial cores. | 11-27-2008 |
20090021089 | Motor and control unit thereof - A motor and a control unit therefor comprise: salient rotor poles and salient stator poles, which are arranged along circumferences of phases A, B and C with an even interval therebetween; magnetic paths for passing magnetic fluxes, the paths permitting the magnetic fluxes passing through the salient rotor and stator poles of each phase to return to the rotor side; and substantially looped windings arranged between the salient stator poles of individual phases and the magnetic paths for passing magnetic fluxes, wherein currents are supplied to the windings in synchronization with the rotational position of the rotor to thereby output torque. Since the structures of the stator, the rotor and the windings are simple, productivity is enhanced, whereby high quality, small size and low cost can be realized. | 01-22-2009 |
20090025203 | Method and apparatus for manufacturing laminated core and the laminated core - An apparatus for manufacturing a laminated stator core from core pieces according to a manufacturing method has a first station, a second station and a piling unit. The first station blanks out a steel plate to form a first hole in one core piece every blanking cycle so as to partly shape a portion of the core piece by forming the first hole. The second station blanks out the plate to form a second hole in one core piece every blanking cycle so as to partly shape the portion of the core piece by forming the second hole. Further, the first station differentiates a position of the first hole in each core piece from those in the other core pieces. Therefore, the core pieces having the respective portions are produced. The piling unit piles up the core pieces in layers to manufacture the laminated stator core. | 01-29-2009 |
20090134734 | Ac motor and control unit thereof - The motor, which is an incorporated N-phased motor, comprises a rotor having four or more poles with N-poles and S-poles being alternately arranged in the circumferential direction, a stator having a stator core in which magnetic circuits are magnetically separated within an electrical angle of 360°, and an (N−1) number (N is a positive integer) of windings. The motor is configured so that currents of the windings can effectively work on the magnetic circuits. | 05-28-2009 |
20090236930 | Motor and control unit thereof - A motor includes: a rotor having permanent magnets in which N-poles and S-poles are alternately arranged in the circumferential direction; seven stator pole groups, each of which has a plurality of stator poles arranged in the circumferential direction, the stator pole groups being arranged with the circumferential and axial positions of the stator poles in one stator pole group being offset from those of other stator pole groups; and a plurality of loop windings formed in the circumferential direction and arranged at positions adjacent to the plurality of stator pole groups in the rotor shaft direction. | 09-24-2009 |
20100123426 | RELUCTANCE MOTOR WITH IMPROVED STATOR STRUCTURE - In a motor, a stationary member is provided with a number M (M is a positive integer) of first poles within 360 electrical degrees at spaces therebetween. A plurality of windings are at least partly wound in the spaces, respectively. A movable member is movably arranged relative to the stationary member and provided with a number K (K is a positive integer) of second poles. The number K of second poles is different from the number M of first poles. A unidirectional current supply unit supplies a unidirectional current to at least one of the windings so as to create an attractive force between at least one of the first poles and a corresponding at least one of the second poles to thereby move the movable member relative to the stationary member. | 05-20-2010 |
20100156232 | Brushless AC motor - An AC motor having loop windings is provided, which is able to reduce unbalance of three-phase impedance to enhance the motor efficiency. Three loop windings of the three phases are interlinked with magnetic fluxes Φu, Φv and Φw of the respective phases to provide magnetic paths of the three phases. The magnetic paths of the three phases are connected to the respective stator poles of the three phases to configure the motor. The magnetic path of each of the three phases is formed by processing an electromagnetic steel plate using bending to provide a motor configuration having multiple stator poles. Magnetic fluxes of two or more stator poles of the same phase are collected to a single magnetic path to form a three-dimensional three-phase magnetic path without allowing close contact with a magnetic path of a different phase. | 06-24-2010 |
20100213782 | FIVE-PHASE MOTOR WITH IMPROVED STATOR STRUCTURE - A five-phase motor includes a stator and a movable member movable relative to the stator in a preset direction. The stator includes a stator core provided with five slots within 360 electrical degrees thereof. The five slots are arranged in the preset direction at preset first pitches. The stator includes at least one set of five-phase stator windings. The five-phase stator windings are arranged in the five slots relative to each other such that each of the five-phase stator windings is wound at a preset second pitch. The second pitch substantially corresponds to two of the first pitches. | 08-26-2010 |
20110241599 | SYSTEM INCLUDING A PLURALITY OF MOTORS AND A DRIVE CIRCUIT THEREFOR - In a system, a plurality of motors are provided. Each of the plurality of motors has a plurality of phase windings. Each of the plurality of motors is rotated when a unidirectional current is supplied to each of the plurality of phase windings thereof. A motor select unit includes a plurality of selectors connected to the plurality of motors, respectively. The motor select unit selects at least one of the plurality of motors via a corresponding at least one of the selectors. A phase current supplier is connected in series to each of the plurality of selectors. The phase current supplier supplies a direct current as the unidirectional current to each of the plurality of phase windings of the selected at least one of the plurality of motors via a corresponding at least one of the selectors. | 10-06-2011 |
20120091940 | AC MOTOR AND CONTROL APPARATUS FOR THE SAME - An AC motor is provided. In the AC motor, there are M pieces (M is an integer of 3 or more) of stator pole groups SPG are arranged in a rotor axis direction, where each of the stator poles groups is composed of a plurality of stator poles which are for the same phase and arranged in a circumferential direction of the motor. Between the stator pole groups SPG, “M−1” pieces of annular windings WR are arranged which allow one-way current to flow therethrough. The windings WR are arranged such that the directions of current passing therethrough are reversed in turn in the rotor axis direction. The stator pole groups SPG are excited to generate magnetic fluxes φG directed in a one way. The excited directions of the magnetic fluxes φG are reversed in turn in the rotor axis direction. | 04-19-2012 |
20120169267 | FULL-PITCH WINDINGS SWITCHED RELUCTANCE MOTOR - A full-pitch winding switched reluctance motor is provided. In this motor, one set of current components are estimated, which electromagnetically act on only one set of stator poles for one phase. Based on the estimated one set of current components, current components for respective three phases are controlled, resulting in accurate current control with no electromagnetic interactions with other phases. This current control allows a control circuit to be made compact, and a motor with effective field means can be provided. | 07-05-2012 |
20120235615 | BRUSHLESS ELECTRIC MOTOR PROVIDED WITH ROTOR HAVING INTERMEDIATE MAGNETIC POLE - An AC electric motor includes an annular A-phase winding WA wound in the circumferential direction of a stator, a stator pole group SPGA configured to generate magnetic flux φA to interlink with the A-phase winding WA, an annular B-phase winding WB wound in the circumferential direction, and a stator pole group SPGB configured to generate magnetic flux φB to interlink with the B-phase winding WB. The motor additionally includes a third stator pole group SPGC, N and S magnetic poles of the rotor, and X magnetic poles, which serve as third rotor poles, showing magnetic characteristics between the N and S magnetic poles of the rotor. DC currents are supplied to the A-phase and B-phase windings WA and WB to generate rotational torque. | 09-20-2012 |
20120319639 | TORQUE GENERATOR USING FULL-PITCH WINDING RELUCTANCE MOTOR AND CONTROL UNIT THEREFOR - A torque generator includes a full-pitch winding reluctance motor provided with three-phase or more coils which are composed of full-pitch windings, and a control unit therefor. The control unit controls currents supplied to the respective phase coils such that the coil for a first phase designated among the phases is first started to be current-supplied and then the coil for a second phase designated among the phases is started to be current-supplied during the current supply to the coil for the first phase. The control unit decreases an amount of the current supplied to the first coil immediately before starting the current supply to the second coil and to reinstate the amount of the current supplied to the first coil in response to starting the current supply to the second coil. | 12-20-2012 |