Abstract: To provide a motor control device which can apply an electric brake to a motor when power supply is stopped, and achieve a miniaturization and a cost reduction. A first switch 11 through a sixth switch 16 connects respective coils L1, L2 and L3 included in a motor to an electric power source 20. The capacitor C accumulates the power supplied from the electric power source 20. A seventh switch 17 connects the capacitor C to a fourth switch 14 through the sixth switch 16, when the power supply from the electric power source 20 is stopped. The operation of the seventh switch 17 causes the fourth switch 14 through the sixth switch 16 to operate by the power accumulated in the capacitor C, and respective coils L1 to L3 are short-circuited to apply the brake to the motor.

Abstract: A linear synchronous motor is provided, of which a core unit may readily be manufactured. Accordingly, the manufacturing cost of the linear synchronous motor may be reduced, and the weight of the linear synchronous motor may be lightened. The linear synchronous motor includes a frame member that is formed of a magnetic conductive material and surrounds the periphery of a core unit centering on a shaft. The frame member functions as a yoke that magnetically connects a plurality of magnetic pole portions. The frame member is constituted from a first divided frame member and a second divided frame member fixed to the core unit with screws.

Abstract: There is provided a stator that can suppress degradation in insulating performance and electrical strength performance, shorten a work time, and improve winding efficiency and heat radiation. The stator 1 includes a yoke part 20 formed to be annular, a plurality of tooth parts 30 protruding from the yoke part 20 in an inward direction perpendicular to an axial direction O of a rotor when the rotor is arranged in the yoke part 20, and protecting members 40 each of which is attached to both end surfaces of the tooth part 30 in the axial direction O to protect a corner of the tooth part 30. The protecting members 40 have a length in a slot 38 between the tooth parts 30 shorter than a half of an entire length of the tooth part 30 in the axial direction.

Abstract: There is provided a stator that suppresses degradation in insulating performance and pressure-resisting performance without an additional insulating member, that can shorten a work time, and improve winding efficiency of a wound wire and heat radiation performance. The stator 1 includes a yoke part 10 of an annular shape, tooth winding portions 21 that protrude inward from the yoke part 10 and around which an electric wire 30 is wound, and a tooth end portion 22 formed on an inward side of the tooth winding portion. The stator 1 is formed by stacking steel plates in a direction corresponding to a rotational axis of a motor.

Abstract: An axial-flow fan includes an impeller mounted on a rotating shaft of a rotary drive device and a venturi casing surrounding an outer periphery of the impeller in a radial direction and including a suction port and a discharge port facing each other in an axial direction of the rotating shaft . An inner surface of the venturi casing includes a suction-side slant part 31 expanding the suction port outward in the radial direction of the impeller, a linear part continuing from the suction-side slant part and forming an axial flow of a fluid with the impeller, a discharge-side slant part 34 expanding the discharge port outward in the radial direction of the impeller, and a curved part connecting the linear part and the discharge-side slant part.

Abstract: A low-cost magnetic encoder that facilitates generating sinusoidal magnetic flux is provided. First and second permanent magnet arrays each include a plurality of permanent magnets arranged such that magnetic poles having the same polarity face each other, and magnetic yokes disposed on side surfaces of the plurality of permanent magnets. The permanent magnets and the magnetic yokes are arranged side by side at a predetermined pitch in the moving direction of a magnetic piece array. First and second magnetic detectors corresponding to the first and second permanent magnet arrays are disposed in a positional relationship allowing detection of leakage magnetic flux generated when the permanent magnet arrays and the magnetic piece array are displaced with respect to each other.

Abstract: At least a rotor fixing portion and a bearing fitting portion are combined to form a hollow rotary shaft. The rotor of a rotary motor portion is fixed on the rotor fixing portion. A thrust radial bearing is fitted on the outer periphery of the bearing fitting portion and a screw nut is fitted to the bearing fitting portion. The rotor fixing portion and the bearing fitting portion are coupled with screw member(s) which are inserted into the hollow rotary shaft from one axial end of the hollow rotary shaft and axially extend inside the bearing fitting portion and the rotor fixing portion. A flange portion of the screw nut is fixed on an abutment portion of the bearing fitting portion in abutment with an end surface of an inner race of the thrust radial bearing that is located on the one axial end side.

Abstract: An electric machine includes a magnetic pole piece array including a plurality of magnetic pole pieces spaced along a permanent magnet array. The permanent magnet array is in immovable relation with winding portions. The pitch of a plurality of permanent magnets and the pitch of a plurality of magnetic pole pieces are determined such that magnetic flux flows through two of the permanent magnets magnetized in the same direction and located in the permanent magnet array with one permanent magnet interposed between the two permanent magnets, and also flows through one or two of the magnetic pole pieces facing the one permanent magnet interposed between the two permanent magnets and magnetized in a direction of magnetization different from the direction of magnetization of the two permanent magnets.

Abstract: A bearing holder mounting structure which allows a motor to be manufactured with a small number of parts without needing complex processing, and such motor are provided. A rotor 1 having a pair of bearings 5A and 5B and a washer 28 mounted thereon is inserted into an opening portion 23a of a motor housing 7 such that a rotor member 11 of the rotor 1 is received in a receiving concave portion 23. A bearing holder 9 is disposed on a bottom wall portion 29a of a fitting recessed portion 29 such that a flange portion 37 of the bearing holder 9 abuts on the bottom wall portion 29a of the fitting recessed portion 29. A retaining fitting 33 is then pressed into the fitting recessed portion 29 such that six engaging pieces 41 are located at positions slightly deviated from positions of six lead-out groove portions 31.

Abstract: The present invention provides a stator core and a stator for a cylinder linear motor at low cost, in which slot pitches can be determined accurately. A stator core for use in a cylinder linear motor has a positioning rod 48 and a plurality of core bodies 42. The positioning rod 48 extends in a rod shape, and a plurality of recesses 480 are formed at predetermined intervals in the extension direction. The plurality of core bodies 42 are formed in a flat plate shape, and a hole 421 in which a movable element can be inserted is formed in a direction orthogonal to the flat plate. In the outer circumference of the plurality of core bodies 42, fitting parts 422 which fit in the recesses 480 are provided. When the fitting parts 422 fit in the recesses 480, the core bodies 142 are positioned at predetermined intervals.

Abstract: An electric machine that allows enhancement of thrust of a mover is provided. An electric machine includes a magnetic pole piece array including a plurality of magnetic pole pieces spaced along a permanent magnet array. The magnetic pole pieces are disposed between the permanent magnet array and winding portions in immovable relation with the winding portions. The pitch of permanent magnets and the pitch of magnetic pole pieces are determined such that magnetic flux flows through two of the permanent magnets magnetized in the same direction and located in the permanent magnet array with one permanent magnet interposed between the two permanent magnets, and also flows through one of the magnetic pole pieces facing the one permanent magnet interposed between the two permanent magnets and magnetized in a direction of magnetization different from the direction of magnetization of the two permanent magnets.

Abstract: An optical encoder device is provided, in which the number of light transmissive slits of a stationary slit plate can be increased as much as possible according to the length of a light receiving surface of a light receiving element to produce an output signal with little distortion. A movable slit plate 3 includes a slit row R1 in which a plurality of light transmissive slits (light transmissive portions) S1 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits (light non-transmissive portions) S2 each having a slit width of 180° in terms of electrical angle are alternately formed. A stationary slit plate 4 includes a slit row R2 in which a plurality of light transmissive slits S3 each having a slit width of 180° in terms of electrical angle and a plurality of light non-transmissive slits S4 each having a slit width of (360Xk-180)° in terms of electrical angle are alternately formed.

Abstract: A linear motor armature in which pressure loss of a coolant flowing in a cooling conduit and possible significant non-uniformity in temperature distribution are reduced over the entire armature. A manifold 5, 6h and a pair of cooling conduits 7, 9 are configured such that a coolant is supplied from one connecting conduit 27 of the cooling conduit 7, and one connecting conduit 33 of the cooling conduit 9, and discharged from the other connecting conduit 29 of the cooling conduit 7 and the other connecting conduit 35 of the cooling conduit 9.

Abstract: An electric apparatus with high performance and high rigidity is provided. Annular positioning stepped portions are formed at respective outer peripheral corner portions of both end portions of a stator core to extend entirely circumferentially of the stator core. An annular positioning projecting portion is formed at a first end bracket to be entirely fitted with one of the annular positioning stepped portions of the stator core. An annular positioning projecting portion is formed at a second end bracket to be entirely fitted with the other annular positioning stepped portion of the stator core.

Abstract: Provided herein is an encoder including a position detecting device provided with a gear mechanism and an optical encoder device. A housing includes a bearing holder provided between a first housing portion and a second housing portion of the housing. The bearing holder serves as a partition wall portion configured to separate the gear mechanism from the optical encoder device. If the gear mechanism is separated from the optical encoder device, abrasion powder or grease can be reliably prevented from scattering from the gear mechanism to adhere to constituent parts of the optical encoder device.

Abstract: A power supply system comprises a battery which can be charged/discharged, a charging/discharging apparatus which charges/discharges the battery, and a charging/discharging power limit controller which outputs a charging/discharging power limit control signal obtained by amplifying a deviation between an output voltage command signal of the battery and a detected output voltage signal obtained by detecting an output voltage of the battery, wherein and the charging/discharging apparatus includes a charging/discharging controller which controls of charging/discharging power of the battery based on the charging/discharging power limit control signal.

Abstract: A power supply system includes an inverter controller which amplifies a deviation between a bus voltage command signal and a bus voltage signal obtained by detecting a bus voltage, inputs the amplified deviation to a first limit unit for limiting output power of a commercial power supply, divides the deviation into a first deviation within a first limit value of the first limit unit and a second deviation which exceeds a range of the first limit value, and controls an inverter on the basis of the first deviation, and a DC/DC converter controller which controls a DC/DC converter on the basis of the second deviation.

Abstract: Provided herein is a linear motor in which a back yoke can readily be mounted onto a linear motor body. The linear motor body is surrounded or wrapped by the back yoke that works to form part of a magnetic circuit of the linear motor body. The back yoke assembly includes first and second divided assemblies. The first and second divided assemblies have the same dimension and shape, and are each formed by press working a silicon steel plate or a magnetic plate made of SPCC material.

Abstract: Provided herein is a linear motor in which a back yoke can readily be mounted onto a plurality of linear motor units. The back yoke is constituted from a back yoke assembly including a surrounding portion that entirely surrounds six linear motor units. The back yoke works to form part of respective magnetic circuits of the six linear motor units. The back yoke assembly includes first and second divided assemblies and five partition wall portions. The first and second divided assemblies are each formed by press working a magnetic plate made of silicon steel.