Abstract: A speed reducer including: a first gear; an eccentric shaft joined to the first gear, the eccentric shaft has first and second supporting portions offset in a rotation radial direction with respect to a first gear rotation shaft; a fixed gear at an eccentric shaft radial direction outer side, and whose rotation is restricted; a transmitting gear supported at the first supporting portion and meshes with the fixed gear, and the transmitting gear revolves around the first gear rotation shaft and rotates around its own axis; an outputting portion rotating due to the transmitting gear revolving and rotating around its own axis; and a locking gear supported at the second supporting portion and meshes with the fixed gear, and the locking gear revolves around the first gear rotation shaft and rotates around its own axis, and rotation of the outputting portion is restricted.

Abstract: A speed reducer includes a helical gear, an eccentric shaft and a slider plate. The speed reducer also includes a transmission gear and an output gear body. The transmission gear is supported at a first support part, transmission gear spinning is restricted by engagement with the slider plate, and the transmission gear revolves by the helical gear rotating with the eccentric shaft. The output gear body rotates by the transmission gear revolving. The transmission gear includes a pair of restricting protrusions protruding toward the slider plate side. The restricting protrusions have engaging surfaces that touch the slider plate wherein the engaging surfaces oppose the slider plate in a radial direction of the transmission gear. Surfaces at opposite sides of the restricting protrusions from the slider plate are formed, as seen in the axis direction of the transmission gear, to be convex to the opposite sides thereof from the slider plate.

Abstract: A gear reducer has a helical gear, an eccentric shaft that is joined to the helical gear and has a first supporting portion that is offset in a rotation radial direction with respect to a rotation shaft of the helical gear, and a slider plate that is disposed at a radial direction outer side of the eccentric shaft. Further, the gear reducer has a transmitting gear that is supported at a first supporting portion, and whose rotation around its own axis is restricted due to the transmitting gear being engaged with the slider plate, and that revolves due to the helical gear rotating together with the eccentric shaft, and has an output gear body that rotates due to the transmitting gear revolving. The transmitting gear has a pair of restricting projections that project-out toward the slider plate side, and the slider plate is disposed between the pair of restricting projections.

Abstract: A speed reducer includes a helical gear, an eccentric shaft and a slider plate. The speed reducer also includes a transmission gear and an output gear body. The transmission gear is supported at a first support part, transmission gear spinning is restricted by engagement with the slider plate, and the transmission gear revolves by the helical gear rotating with the eccentric shaft. The output gear body rotates by the transmission gear revolving. The transmission gear includes a pair of restricting protrusions protruding toward the slider plate side. The restricting protrusions have engaging surfaces that touch the slider plate wherein the engaging surfaces oppose the slider plate in a radial direction of the transmission gear. Surfaces at opposite sides of the restricting protrusions from the slider plate are formed, as seen in the axis direction of the transmission gear, to be convex to the opposite sides thereof from the slider plate.

Abstract: A gear reducer has a helical gear, an eccentric shaft that is joined to the helical gear and has a first supporting portion that is offset in a rotation radial direction with respect to a rotation shaft of the helical gear, and a slider plate that is disposed at a radial direction outer side of the eccentric shaft. Further, the gear reducer has a transmitting gear that is supported at a first supporting portion, and whose rotation around its own axis is restricted due to the transmitting gear being engaged with the slider plate, and that revolves due to the helical gear rotating together with the eccentric shaft, and has an output gear body that rotates due to the transmitting gear revolving. The transmitting gear has a pair of restricting projections that project-out toward the slider plate side, and the slider plate is disposed between the pair of restricting projections.

Abstract: A speed reducer including: a first gear; an eccentric shaft joined to the first gear, the eccentric shaft has first and second supporting portions offset in a rotation radial direction with respect to a first gear rotation shaft; a fixed gear at an eccentric shaft radial direction outer side, and whose rotation is restricted; a transmitting gear supported at the first supporting portion and meshes with the fixed gear, and the transmitting gear revolves around the first gear rotation shaft and rotates around its own axis; an outputting portion rotating due to the transmitting gear revolving and rotating around its own axis; and a locking gear supported at the second supporting portion and meshes with the fixed gear, and the locking gear revolves around the first gear rotation shaft and rotates around its own axis, and rotation of the outputting portion is restricted.

Abstract: To manufacture a permanent magnetic motor having saliency at a low cost, a permanent magnet motor includes a stator provided with an armature winding configured to form a plurality of phases, a rotor having a surface facing the stator, the rotor including a permanent magnet disposed to face the stator, the permanent magnet having a plurality of magnetic poles arranged in a circumferential direction of the rotor, and a conductive member made of a conductive material and disposed on the surface of the rotor facing the stator.

Abstract: An angle estimator includes correction means for correcting a phase of an error parameter to obtain a corrected error parameter and estimation means for calculating an estimated speed and an estimated angle of the motor based on the corrected error parameter. The error parameter is a function of an angle error representing a difference between an actual angle and an estimated angle of a motor.

Abstract: According to an embodiment of the present invention, a rotation-angle detection device for detecting a rotation angle of a rotor includes: plural rotation detectors that output detection signals which vary with the rotation angle of the rotor; a rotation calculator that outputs a rotated vector by rotating a vector expressed by the detection signals; an amplitude detector that outputs an amplitude signal indicating amplitude of the detection signals by performing computation on at least one of signals expressing the rotated vector using a predetermined target amplitude; a drive-power adjuster that adjusts the amplitude of the detection signals by changing drive power applied to the rotation detectors according to the amplitude signal; a corrector that corrects the amplitude based on the amplitude signal and outputs a corrected detection signal; and a rotation angle detector that detects a rotation angle of the rotor based on the corrected detection signal.

Abstract: An angle detection device which includes multiple sensors to output multiple sinusoidal signals having different phases according to the rotation angle of a rotating body; a rotation calculation device to detect the rotation angle based on the multiple sinusoidal signals and detect an amplitude of the multiple sinusoidal signals to output the amplitude of the multiple sinusoidal signals as amplitude signal; and an amplitude comparison device to compare the amplitude signal with a predetermined amplitude target value and output an amplitude error signal indicating the comparison result; wherein the error of amplitude of the multiple sinusoidal signals is corrected by increasing or decreasing a drive input of a sensor driving unit based on the amplitude error signal.

Abstract: An angle estimator includes correction means for correcting a phase of an error parameter to obtain a corrected error parameter and estimation means for calculating an estimated speed and an estimated angle of the motor based on the corrected error parameter. The error parameter is a function of an angle error representing a difference between an actual angle and an estimated angle of a motor.

Abstract: To manufacture a permanent magnetic motor having saliency at a low cost, a permanent magnet motor includes a stator provided with an armature winding configured to form a plurality of phases, a rotor having a surface facing the stator, the rotor including a permanent magnet disposed to face the stator, the permanent magnet having a plurality of magnetic poles arranged in a circumferential direction of the rotor, and a conductive member made of a conductive material and disposed on the surface of the rotor facing the stator.

Abstract: A motor control device includes: a unit configured to generate a target rotation position information of a first driving motor based on target rotation position signals indicating a target rotation position of a second driving motor being replaced with the first driving motor; a unit configured to generate a speed predicting of the first driving motor; a unit configured to detect a rotation position of the first driving motor; a unit configured to generate an actual position information of the first driving motor; a unit configured to generate an actual speed of the first driving motor; a unit configured to correct an error between the target rotation position and the actual rotation position of the first driving motor; a unit configured to generate a speed error signal; a unit configured to generate a speed control signals of the first driving motor; and a unit configured to output a drive voltage.

Abstract: Determining an amount of rotating a vector according to a result of comparing the rotated vector with a predetermined phase and rotating the vector according to the determined amount of rotating the vector are repeated to acquire the determined amount of rotating the vector as a rotation angle of a rotation shaft. Based on the thus acquired amount of rotating the vector, a rotation angle change signal is generated for acquiring a state of a change of the rotation angle of the rotation shaft. A signal indicating to increase or decrease a fixed amount is generated for increasing or decreasing the amount of rotating the vector according to the result of the comparison.

Abstract: A position estimation device that estimates a position of a rotor of a motor, includes a current detection unit detecting a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor; and a harmonic wave signal that are superimposed on each other. The device further detects a harmonic wave current, which is a response of the harmonic wave signal, as a second detection current; and has a position estimation unit estimating the position of the rotor of the motor based on the second detection current.

Abstract: Determining an amount of rotating a vector according to a result of comparing the rotated vector with a predetermined phase and rotating the vector according to the determined amount of rotating the vector are repeated to acquire the determined amount of rotating the vector as a rotation angle of a rotation shaft. Based on the thus acquired amount of rotating the vector, a rotation angle change signal is generated for acquiring a state of a change of the rotation angle of the rotation shaft. A signal indicating to increase or decrease a fixed amount is generated for increasing or decreasing the amount of rotating the vector according to the result of the comparison.

Abstract: An angle detection device which includes multiple sensors to output multiple sinusoidal signals having different phases according to the rotation angle of a rotating body; a rotation calculation device to detect the rotation angle based on the multiple sinusoidal signals and detect an amplitude of the multiple sinusoidal signals to output the amplitude of the multiple sinusoidal signals as amplitude signal; and an amplitude comparison device to compare the amplitude signal with a predetermined amplitude target value and output an amplitude error signal indicating the comparison result; wherein the error of amplitude of the multiple sinusoidal signals is corrected by increasing or decreasing a drive input of a sensor driving unit based on the amplitude error signal.

Abstract: According to an embodiment of the present invention, a rotation-angle detection device for detecting a rotation angle of a rotor includes: plural rotation detectors that output detection signals which vary with the rotation angle of the rotor; a rotation calculator that outputs a rotated vector by rotating a vector expressed by the detection signals; an amplitude detector that outputs an amplitude signal indicating amplitude of the detection signals by performing computation on at least one of signals expressing the rotated vector using a predetermined target amplitude; a drive-power adjuster that adjusts the amplitude of the detection signals by changing drive power applied to the rotation detectors according to the amplitude signal; a corrector that corrects the amplitude based on the amplitude signal and outputs a corrected detection signal; and a rotation angle detector that detects a rotation angle of the rotor based on the corrected detection signal.

Abstract: An angle detection device includes a vector generating unit that generates a vector based on the sine wave signals output by a plurality of sensors, a vector rotating unit that rotate the vector based on the vector and reference sine waves with different phases, a sign determining unit that determines whether the rotated vector is located in a positive direction or in a negative direction with respect to a predetermined reference angle and outputs a result of determination as a sign determination signal, and an angle counter that increments or decrements a count value of angular data of a predetermined bit length based on the sign determination signal, and outputs the count value as angular data. A deadband with a predetermined reference angle as a center is provided for a process performed by the sign determining unit to determine one of the positive direction and the negative direction.

Abstract: A motor drive controller to control a motor via multiple sensors includes a first phase detector to compare respective differential pairs of the sensor signals from the same sensor to detect phases of the rotor, and output a first phase information signal; a second phase detector to compare a respective one of the multiple sensor signals with another sensor signal from the different sensor to detect the phases and output a second phase information signal; a phase divider to divide the phases, detected by the first and second phase detectors, into multiple predetermined phase intervals; a signal selector to select one of the multiple sensor signals in the multiple predetermined phase intervals; and a third phase detector to detect whether the signal selected by the signal selector reaches a predetermined threshold level corresponding to a predetermined phase of the rotor, and output a third phase information signal.