Oriental Motor Co.

Tokyo, Japan

Oriental Motor Co.

Tokyo, Japan
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Patent
Japan National Institute of Advanced Industrial Science, Technology, LITHO Technology JAPAN CORPORATION and Oriental Motor Co. | Date: 2016-09-09

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.


Patent
Oriental Motor Co. | Date: 2014-01-15

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. In a grease leakage preventing structure for a gear reducer of a dynamoelectric machine with the gear reducer, in which gear teeth are provided in a leading edge portion of the output shaft of the dynamoelectric machine, the leading edge portion of the dynamoelectric machine output shaft is introduced into a case of the gear reducer via an input port of the gear reducer, and the dynamoelectric machine output shaft with the gear teeth is engaged with a gear arranged inside the case of the gear reducer, the grease leakage preventing structure is provided with a grease blocking member (3A, 3B, 3C, 3D) provided on a terminal end of an engagement portion (16b) of the dynamoelectric machine output shaft (14A) and is configured to inhibit inflow of grease into the dynamoelectric machine, and in this structure, the grease blocking member (3A, 3B, 3C, 3D) is provided with a wall surface portion (3Aa, 3Ba, 3Ca, 3Da) formed in a direction perpendicular to the gear teeth (16) provided in the leading edge portion of the dynamoelectric machine output shaft (14A).


Patent
Oriental Motor Co. | Date: 2013-06-12

The present invention provides a method and a structure for mounting a sensor substrate of a brushless motor, in which a rotation detection element is arranged near a permanent magnet of a rotor and the sensor substrate can be securely mounted with a simple method, and thus, it is not necessary to elongate the dimension of the permanent magnet of the rotor in an axial direction. In the present invention, insulating members that insulate a location for winding of a stator coil from an outside are formed on a stator core (20) on which radially arranged pole teeth (20b) are provided on an inner peripheral surface side of the stator core (20) with a predetermined space, a stator coil is wound around the pole teeth via the insulating members, stopper walls (83) for preventing the coming off of the stator coil are provided to the pole teeth of the insulating member on a leading edge thereof, pedestal parts (84) are formed on the stopper walls (83) on an inner periphery surface side thereof, a sensor substrate (9) to which a position detection element which detects the position of a permanent magnet (30) provided to a rotor (3) is arranged on the pedestal parts (84), locking portions for locking the sensor substrate (9) are provided to some of the pedestal parts (84), and thereby the coming off of the sensor substrate (9) in an axial direction is prevented.


The present invention provides a method and a structure for mounting a sensor substrate of a brushless motor, in which a rotation detection element is arranged near a permanent magnet of a rotor and the sensor substrate can be securely mounted with a simple method, and thus, it is not necessary to elongate the dimension of the permanent magnet of the rotor in an axial direction. In the present invention, insulating members that insulate a location for winding of a stator coil from an outside are formed on a stator core (20) on which radially arranged pole teeth (20b) are provided on an inner peripheral surface side of the stator core (20) with a predetermined space, a stator coil is wound around the pole teeth via the insulating members, stopper walls (83) for preventing the coming off of the stator coil are provided to the pole teeth of the insulating member on a leading edge thereof, pedestal parts (84) are formed on the stopper walls (83) on an inner periphery surface side thereof, a sensor substrate (9) to which a position detection element which detects the position of a permanent magnet (30) provided to a rotor (3) is arranged on the pedestal parts (84), locking portions for locking the sensor substrate (9) are provided to some of the pedestal parts (84), and thereby the coming off of the sensor substrate (9) in an axial direction is prevented.


The present invention addresses the problem of detecting the absolute amount of displacement of a moving body. According to the present embodiment, 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. The multi-turn absolute angle of rotation (c) of the main shaft is calculated by a rotation angle synthesizer (19) on the basis of the period signal (r) of the main shaft and the angle detection value (s) of the main shaft. The present invention can be applied to devices for detecting the amount of displacement of a moving body moving in a straight line.


Patent
Oriental Motor Co. | Date: 2015-12-23

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. In a grease leakage preventing structure for a gear reducer of a dynamoelectric machine with the gear reducer, in which gear teeth are provided in a leading edge portion of the output shaft of the dynamoelectric machine, the leading edge portion of the dynamoelectric machine output shaft is introduced into a case of the gear reducer via an input port of the gear reducer, and the dynamoelectric machine output shaft with the gear teeth is engaged with a gear arranged inside the case of the gear reducer, the grease leakage preventing structure is provided with a grease blocking member (3A, 3B, 3C, 3D) provided on a terminal end of an engagement portion (16b) of the dynamoelectric machine output shaft (14A) and is configured to inhibit inflow of grease into the dynamoelectric machine, and in this structure, the grease blocking member (3A, 3B, 3C, 3D) is provided with a wall surface portion (3Aa, 3Ba, 3Ca, 3Da) formed in a direction perpendicular to the gear teeth (16) provided in the leading edge portion of the dynamoelectric machine output shaft (14A).


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) = (-(m1)/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 (m1) 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 p_(1) of the first rotating shaft which is a rotation angle of the first rotating shaft and R_(0)xm^(0)+R_(1)m^(1)+...R_(n-2)m^(n-2) corresponding to the number of revolutions of the first rotating shaft, coefficients R_(0) to R_(n-2) are obtained on the basis of detected values from angle detectors of the respective shafts, and the multi-turn rotation angle of the first rotating shaft is calculated. Detection errors generated in the angle detectors of the second and subsequent rotating shafts can be effectively reduced, and a high-accuracy multi-turn rotation angle can be calculated.


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 (P_(0(4X)), P_(1(1X)), P_(2(1X)), P_(3(1X))) to a multi-turn arithmetic circuit (25). The determination region of the detected value (P_(0(4X))) of a main shaft is determined, and the rotation angle of the main shaft is found. Further, periodic signal values indicating the differences in rotation angle between the main shaft and first to third counter shafts are generated, respectively, and on the basis of a combination of the relative numbers of rotations of the first to third counter shafts found from the respective periodic signal values, the number of rotations of the main shaft is found. The multi-turn absolute rotation angle can be obtained by adding the rotation angle to the number of rotations of the main shaft.


Patent
Oriental Motor Co. | Date: 2014-02-05

It is an object to provide a compact absolute encoder device, which is readily assembled and realizes high resolution. The present invention provides an absolute encoder device (1), including: a permanent magnet (4) including a first magnetic pattern 14 (bipolar) and a second magnetic pattern (16) (multipolar); a first magnetic sensor (5) for detecting a magnetic field of the first magnetic pattern (14); a second magnetic sensor (6) for detecting a magnetic field of the second magnetic pattern (16); and a signal processing circuit (7) for calculating an absolute rotation angle of a rotation shaft (2) based on output signals of the first and second magnetic sensors (5 and 6). The first and second magnetic sensors (5 and 6) and the signal processing circuit (7) are fixed to a single substrate (8). The first magnetic pattern (14) is formed on a plane extending in a direction crossing an axial direction inside the permanent magnet (4), and the second magnetic pattern (16) is formed on an outer peripheral surface of the permanent magnet (4).


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) = (-(m1)/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 (m1) 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 p_(1) of the first rotating shaft which is a rotation angle of the first rotating shaft and R_(0)m^(0)+R_(1)m^(1)+...R_(n-2)m^(n-2) corresponding to the number of revolutions of the first rotating shaft, coefficients R_(0) to R_(n-2) are obtained on the basis of detected values from angle detectors of the respective shafts, and the multi-turn rotation angle of the first rotating shaft is calculated. Detection errors generated in the angle detectors of the second and subsequent rotating shafts can be effectively reduced, and a high-accuracy multi-turn rotation angle can be calculated.

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