Abstract: A stepping motor control device is provided, which controls a stepping motor including a rotor position detector by micro-step driving. The control device has a plurality of operation modes including an adjustment mode and a use mode. In the adjustment mode, the control device generates control data for a closed loop control for controlling the winding current of the stepping motor based on the detection value of the rotor position detector, and performs a stepping motor acceleration operation and a stepping motor deceleration operation according to the control data. In the use mode, the control device performs the stepping motor acceleration operation and the stepping motor deceleration operation so that a winding current observed in the adjustment mode is reproduced by an open loop control for controlling the winding current of the stepping motor based on the control data generated in the adjustment mode.

Abstract: A stepping motor driver which drives a stepping motor according to a position angle command includes: a current detector that detects a phase current; an inverter that applies a current to a winding; and a control unit that controls the inverter.

Abstract: An AC motor control device controls an inverter that supplies an alternating current to an AC motor which is a three-phase permanent magnet synchronous motor. The AC motor control device includes: pulse width modulation signal generation means that supplies a pulse width modulation signal to the inverter so that a position detection voltage vector for detection of the position of the rotor of the AC motor is applied to the AC motor; current derivative detection means that detects a current derivative occurring due to application of the position detection voltage vector to the AC motor; rotor position computation means that computes an estimated position of the rotor of the AC motor; rotor position correction means that corrects the estimated position; and drive control means that controls the pulse width modulation signal generation means so as to drive the AC motor.

Abstract: A motor control device controls an AC motor by sensorless control. The motor control device includes: an inverter; a multilayer printed circuit board including an inner layer having a wiring pattern provided in a current line connecting the inverter to a winding of the AC motor; a plurality of chip inductors mounted on a major surface of the multilayer printed circuit board in opposed relation to the wiring pattern, and connected in series to form a series circuit having a midpoint connected to a reference potential; load resistors connected between the midpoint of the series circuit and the opposite ends of the series circuit; a differential amplification circuit connected to the series circuit; and a control unit that estimates the position of the rotor of the AC motor by using an output of the differential amplification circuit, and generates the pulse width modulation signal to be supplied to the inverter.

Abstract: A stepping motor includes a stator, and a rotor disposed in opposed relation to the stator and movable in a predetermined movement direction. The stator has a plurality of main poles, windings for the respective main poles, a plurality of stator teeth disposed on each of the main poles and spaced circumferentially from each other, and stator slots provided between respective adjacent pairs of the stator teeth. The rotor has a plurality of rotor teeth spaced from each other in the movement direction, and rotor slots provided between respective adjacent pairs of the rotor teeth. Slot magnets of hard magnetic inserts each magnetized in a slot depth direction are respectively provided in the stator slots and/or the rotor slots. The slot magnets each have a width that is 60% to 80% of the width of each of the slots as measured in the movement direction.

Abstract: A motor control device is provided, which drives a two-phase synchronous motor. The motor control device includes: control current waveform generating means which generates a control current waveform by superposing a fundamental sinusoidal wave and a reluctance torque correction waveform that suppresses the fluctuation of the reluctance torque of the two-phase synchronous motor; and current control signal generating means which generates a current control signal for supplying a current to the windings of the two-phase synchronous motor according to the control current waveform generated by the control current waveform generating means. The reluctance torque correction waveform may have a waveform profile such that an original waveform having a frequency twice that of the fundamental sinusoidal wave and having a phase matched with that of the fundamental sinusoidal wave is full-wave-rectified to the same sign as or a different sign from that of the fundamental sinusoidal wave.

Abstract: A stepping motor control device is provided, which controls a stepping motor including a rotor position detector by micro-step driving. The control device has a plurality of operation modes including an adjustment mode and a use mode. In the adjustment mode, the control device generates control data for a closed loop control for controlling the winding current of the stepping motor based on the detection value of the rotor position detector, and performs a stepping motor acceleration operation and a stepping motor deceleration operation according to the control data. In the use mode, the control device performs the stepping motor acceleration operation and the stepping motor deceleration operation so that a winding current observed in the adjustment mode is reproduced by an open loop control for controlling the winding current of the stepping motor based on the control data generated in the adjustment mode.

Abstract: To reduce abnormal noise production in a friction brake structure, the friction brake structure includes: a brake plate (20) fixed to a rotating shaft (15) of a rotary electric machine (1); a ring-shaped brake shoe (30) disposed facing the brake plate; and a brake shoe support plate (40) which engages with a fixing portion of the rotary electric machine so as to be movable in an axial direction, and which supports the brake shoe and is biased by biasing action so as to bring the brake shoe into sliding contact with the brake plate.

Abstract: An electrostatic encoder (40) detects the rotation angle of a rotor (42) with great accuracy based on the change in the capacitance between electrodes arranged on a stator (41) and the rotor (42). Detection electrodes (44a to 44d) and transmission electrodes (45a to 45d) are arranged circumferentially and alternately on the stator (41). Detection signals (phase A, phase B) amplitude-modulated based on the rotation of the rotor (42) and having a mutual phase difference of 90 degrees are output from adjacent ones of the detection electrodes. Modulated signals (V1, V2) are generated by demodulating the detection signals having a mutual phase difference of 90 degrees. Applying resolver-digital (RD) conversion processing to the modulated signals allows obtaining the rotation angle of the rotor.

Abstract: A columnar laminar flow generation device includes: a placement part on which to place a processing target; a gas blow-out part having an opening; and a gas suction path; wherein the placement part is positioned in a space whose outer periphery surface is constituted by extending the interior wall of the opening in the direction vertical to the opening; the opening has, in its interior wall, a gas blow-out port through which a gas is blown out in one direction vertical to the opening; and the gas suction path is formed in such a way that it suctions the gas in the direction opposite to the one in which the gas is blown out. The columnar laminar generation device is capable of generating columnar laminar flows.

Abstract: Some embodiments include an absolute displacement detection device configured to calculate, from a plurality of displacement detection signals provided by a plurality of displacement detection mechanisms that detect displacement amounts, an absolute periodic signal having an absolute periodic signal period larger than displacement detection signal periods of the plurality of the displacement detection signals. Other embodiments of related devices and methods are also disclosed.

Abstract: An electrostatic encoder (40) detects the rotation angle of a rotor (42) with great accuracy based on the change in the capacitance between electrodes arranged on a stator (41) and the rotor (42). Detection electrodes (44a to 44d) and transmission electrodes (45a to 45d) are arranged circumferentially and alternately on the stator (41). Detection signals (phase A, phase B) amplitude-modulated based on the rotation of the rotor (42) and having a mutual phase difference of 90 degrees are output from adjacent ones of the detection electrodes. Modulated signals (V1, V2) are generated by demodulating the detection signals having a mutual phase difference of 90 degrees. Applying resolver-digital (RD) conversion processing to the modulated signals allows obtaining the rotation angle of the rotor.

Abstract: This detection device is configured from a gear mechanism (1) provided with first to third counter-shaft gears that mesh with a main-shaft gear (10b), and has a relationship in which the difference between the numbers of teeth of the main-shaft gear and the first counter-shaft gear is two or an integer (a) exceeding two, the difference between the numbers of teeth of the main-shaft gear and the second counter-shaft gear is one, and the number of teeth of the first counter-shaft gear is an integral multiple of the product of the difference of the number of teeth thereof from that of the main-shaft gear and the shaft angle multiplier of a main shaft detector. The detected values of angle detectors (RS0-RS3) are given as digitized angle detected values (P0(4X), P1(1X), P2(1X), P3(1X)) to a multi-turn arithmetic circuit (25). The determination region of the detected value (P0(4X)) of a main shaft is determined, and the rotation angle of the main shaft is found.

Abstract: There is provided a method for calculating with high accuracy a multi-turn absolute rotation angle of a motor rotating shaft coupled to a motor output shaft. In a rotation angle detection device according to this invention, a rotation angle ?n of an n-th rotating shaft satisfies the relationship with a rotation angle ?1 of the motor rotating shaft: ?n=(?(m±1)/m)n?1×?1. The rotation angle detection device as an embodiment of a mechanism satisfying the relationship includes a gear mechanism in which a gear having (m±1) teeth meshes with a gear having m teeth between each adjacent two of first to n-th rotating shafts. A multi-turn rotation angle of the first rotating shaft is expanded to a detected value p1 of the first rotating shaft which is a rotation angle of the first rotating shaft and R0×m0+R1×m1+ . . .

Abstract: There is provided a method for calculating with high accuracy a multi-turn absolute rotation angle of a motor rotating shaft coupled to a motor output shaft. In a rotation angle detection device according to this invention, a rotation angle ?n of an n-th rotating shaft satisfies the relationship with a rotation angle ?1 of the motor rotating shaft: ?n=(?(m±1)/m)n?1×?1. The rotation angle detection device as an embodiment of a mechanism satisfying the relationship includes a gear mechanism in which a gear having (m±1) teeth meshes with a gear having m teeth between each adjacent two of first to n-th rotating shafts. A multi-turn rotation angle of the first rotating shaft is expanded to a detected value p1 of the first rotating shaft which is a rotation angle of the first rotating shaft and R0×m0+R1×m1+ . . .

Abstract: A grease leakage preventing structure is provided for a gear reducer of a dynamoelectric machine with a gear reducer, which is capable of preventing, if soft grease with high consistency is employed in a gear reducer driven at a high speed for high output power, leakage of grease from the reducer toward the dynamoelectric machine, by covering an output shaft of the dynamoelectric machine with a grease blocking member.

Abstract: The present invention provides an absolute encoder device, including: a permanent magnet including a first magnetic pattern (bipolar) and a second magnetic pattern (multipolar); a first magnetic sensor for detecting a magnetic field of the first magnetic pattern; a second magnetic sensor for detecting a magnetic field of the second magnetic pattern; and a signal processing circuit for calculating an absolute rotation angle of a rotation shaft based on output signals of the first and second magnetic sensors. The first and second magnetic sensors and the signal processing circuit are fixed to a single substrate. The first magnetic pattern is formed on a plane extending in a direction crossing an axial direction inside the permanent magnet, and the second magnetic pattern is formed on an outer peripheral surface of the permanent magnet.

Abstract: A method and a structure are provided for mounting a sensor substrate of a brushless motor. Insulating members are formed on a stator core on which radially arranged pole teeth are provided on an inner peripheral surface side of the stator core with a predetermined space, a stator coil is wound around the pole teeth via the insulating members, stopper walls are provided to the pole teeth of the insulating member on a leading edge thereof, pedestal parts are formed on the stopper walls on an inner periphery surface side thereof, a sensor substrate to which a position detection element which detects the position of a permanent magnet provided to a rotor is arranged on the pedestal parts, locking portions for locking the sensor substrate are provided to some of the pedestal parts, and thereby the coming off of the sensor substrate in an axial direction is prevented.

Abstract: This detection device is configured from a gear mechanism (1) provided with first to third counter-shaft gears that mesh with a main-shaft gear (10b), and has a relationship in which the difference between the numbers of teeth of the main-shaft gear and the first counter-shaft gear is two or an integer (a) exceeding two, the difference between the numbers of teeth of the main-shaft gear and the second counter-shaft gear is one, and the number of teeth of the first counter-shaft gear is an integral multiple of the product of the difference of the number of teeth thereof from that of the main-shaft gear and the shaft angle multiplier of a main shaft detector. The detected values of angle detectors (RS0-RS3) are given as digitized angle detected values (P0(4X), P1(1X), P2(1X), P3(1X)) to a multi-turn arithmetic circuit (25). The determination region of the detected value (P0(4X)) of a main shaft is determined, and the rotation angle of the main shaft is found.

Abstract: Some embodiments address a problem of detecting the absolute amount of displacement of a moving body. In various embodiments, the multi-turn absolute angle of rotation of a main shaft is calculated from a rotation angle detected by an angle sensor joined to the main shaft and a countershaft. The rotation of a main shaft (12) joined to a rotary drive source (11) is transmitted to countershafts (13, 14) at a predetermined gear ratio. The rotation angles (Ss, Sp, Sq) of the main shaft (12) and the countershafts (13, 14) are detected by angle sensors (15a, 15b, 15c), each of the rotation angles is sent to a synchronizing/integer-obtaining processor (17) by an AD-conversion-angle calculator (16) as angle detection values (?s, ?p, ?q), and period signals (p, q) obtained as integers are calculated. The period signals (p, q) are sent to a period computer (18), and the period signal (r) of the main shaft is calculated.