Abstract: A casing of a centrifugal fan includes a suction port forming wall portion, an opposed wall portion opposed to the suction port forming wall portion, and a sidewall portion connecting the suction port forming wall portion and the opposed wall portion. A tongue portion is provided at the sidewall portion. The tongue portion projects into an air passage in the vicinity of a discharge port to form a narrowed air passage portion within the air passage. A leading end surface of the tongue portion is shaped such that the width of the leading end surface increases from the suction port forming wall portion, where the suction port is formed, to the opposed wall portion. The tongue portion is shaped such that the projecting length of the tongue portion into the air passage continuously decreases from the suction port forming wall portion to the opposed wall portion.

Abstract: A motor control device includes a model control system that controls a motor machine model position using a target value (a position instruction after differentiation) related to a position instruction, and a feedback control system that controls a motor position using the target value (a position instruction after differentiation) related to the position instruction and an amount of control (model position) of the model control system. The feedback control system controls the motor position using the amount of control (model position) of the model control system at all times.

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: A motor characteristic inspecting device is capable of inspecting the condition of a motor installed in an apparatus without removing the motor from the apparatus. The motor characteristic inspecting device includes: a vector variation computing section configured to compute a voltage vector variation amount when a mover of a three-phase motor is moved by an external force; a speed variation detecting section configured to detect a speed variation amount; a constant computing section configured to compute a counter electromotive force constant; and a result display section. Armature windings of the motor installed in the apparatus and the motor characteristic inspecting device are electrically connected with power supply lines disconnected from the motor. An external force is applied to the mover of the motor. The condition of the motor is determined based on the computed result displayed on the result display section of the motor characteristic inspecting device.

Abstract: A moving magnetic field generating apparatus includes a magnet array including magnets disposed at a first pitch such that N and S poles of adjacent magnets in the magnet array are alternated, and first and second magnetic pole piece arrays extending along the magnet array to interpose the magnet array therebetween with a gap from the magnet array. The first and second magnetic pole piece arrays are disposed with a predetermined phase difference therebetween. The first magnetic pole piece array includes first magnetic pole pieces disposed at a second pitch in an array and each having a length enough to face at least two adjacent magnets in the magnet array. The second magnetic pole piece array is configured similarly to the first magnetic pole piece array. One of the first and second magnetic pole piece arrays and the magnet array is relatively moved to the other at a predetermined speed.

Abstract: Block components having a conductive property are mounted on lands for connection to a harness so as to increase the height of the lands on a circuit board which is to be connected to windings.

Abstract: To realize an encoder having highly reliable detection accuracy and capable of reducing a device cost. A light detection unit of an encoder receives light irradiated by a light source and transmitted through light-transmitting portions of Gray code optical patterns of a rotating disk and a light-transmitting/shielding member, and detects the light as digital data. A magnetic detection unit detects a magnetic pattern of a magnet provided on a rotation center portion of the rotating disk as digital data. A processing unit compares the digital data of the magnetic detection unit and the digital data of the light detection unit, and corrects a detection error.

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: The present invention provides a shaft rotary type linear motor that enables a movable element to rotate and linearly move by using a simple structure, and can therefore support compact, space-saving and lightweight designs. The shaft rotary type linear motor includes: a shaft; an outer cylinder; a hollow movable element having a plurality of permanent magnets within the outer cylinder; an armature surrounding the hollow movable element and having a plurality of coils; and a frame containing the armature. The shaft is supported by a rotatable and linearly movable linear guide.

Abstract: A fan motor is provided that prevents restraint on a rotor in an environment where oil and dust are floating in the air. The fan motor includes a stator constituted of an armature having a winding thereon, a rotor constituted of an excitation unit including a permanent magnet, and a vane wheel fixed to the rotor and including a plurality of vanes. The vanes or the vane wheel are formed so as to generate airflow from the side of a frame boss toward a hub unit of the vane wheel.

Abstract: A generator core that increases the amount of power generated by a generator is provided. A plurality of magnetic steel sheets including non-divided magnetic steel sheets and divided magnetic steel sheets are stacked on each other to form a plurality of divided cores. The divided magnetic steel sheets are disposed to form a gap portion that crosses a magnetic path in one magnetic steel sheet. Each gap portion is positioned and shaped such that magnetic resistances of magnetic pole portions of the plurality of divided cores are not different from each other.

Abstract: A thin motor includes a rotor 1 having permanent magnets and a stator having windings. In winding installation portions of the stator core, recesses are formed by reducing the thickness of the stator core, and the windings are accommodated in the recesses.

Abstract: A linear motor comprises an exciter that includes a plurality of permanent magnets in a shaft, an armature that surrounds the exciter and includes a plurality of coils, and a frame that houses the armature, wherein the armature houses the plurality of coils in a magnetic tube which has a linear opening.

Abstract: A rotational-linear motion converter includes a cylindrical magnet rotor, a linear rail, a teeth row, and a magnet row. The magnet rotor includes a magnet row magnetized in a radial direction of the magnet rotor. The rail includes a plurality of projecting portions and recessed portions. The teeth row includes teeth and allows a magnetic flux flowing from the magnet row of the magnet rotor to pass between the magnet rotor and the rail. The magnet row includes magnets and is magnetized in an extending direction of the rail in order to align the magnetic flux flowing from the magnet row of the magnet rotor toward the projecting portions and the recessed portions of the rail. In the magnet row magnetized in the extending direction of the rail, the same polarity faces of adjacent magnets oppose each other in the extending direction of the rail.

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: The inductor type rotary motor of m-phase (m represents an integer of 2 or more) includes a stator in which distal ends of teeth are circularly disposed, and a rotor having an inductor tooth that faces each of the distal ends of the teeth through a constant gap. The stator includes k·m teeth (k represents an integer of 1 or more), at least one permanent magnet is disposed at each of the teeth, and adjacent permanent magnets, which belong to teeth adjacent to each other, are disposed in such a manner that different polarities face each other.

Abstract: An interior magnet linear induction motor includes an armature and a line of inductor teeth. The armature includes coils arranged between a plurality of teeth, and the line of inductor teeth is arranged so as to face the armature and includes a plurality of tooth portions arranged at a constant pitch in a linear stroke direction. An end portion of each of the plurality of teeth has a shape such that magnetoresistance of the tooth increases toward the root side. At least one permanent magnet is arranged at an end portion of each of the plurality of teeth and adjacent permanent magnets that are arranged at different teeth are magnetized such that opposite magnetic poles face each other.

Abstract: A sealing-member-equipped shielded cable includes a shielded cable that includes shielded wires and a sealing member that is molded from a resin and that includes an electrically conductive member in at least a portion thereof. The sealing member is integrally formed on one end portion of the shielded cable, and the shielded wires are electrically connected to the electrically conductive member of the sealing member.

Abstract: A counter-rotating axial flow fan with reduced noise at the target operating point achieved without modifying a front impeller, a rear impeller, or a middle stationary portion is provided. An annular rib including a projecting surface for generating turbulent flow is formed on an inner wall portion of a casing at a position off from the middle stationary portion to a side of the rear impeller, the projecting surface extending radially inwardly of the inner wall portion and extending continuously in the circumferential direction of the inner wall portion. A fluid striking the projecting surface for generating turbulent flow is partially disturbed to form a turbulent flow before entering an area in which the rear impeller is provided. The turbulent flow suppresses flow separation of a fluid flowing along the surfaces of rear blades of the rear impeller from the surfaces of the rear blades.