Abstract: A control device for an actuator learns a reference position of a shaft when the operation of the engine of a vehicle is not obstructed in a period during which the engine is operating, and performs feedback control by using the reference position learned thereby in such a way that the position of the shaft detected by a position sensor gets close to a target position.

Abstract: A position sensor mounted in an actuator includes a magnetic detecting element for detecting the position of a shaft, and a temperature detecting element for detecting intra-sensor temperature which is used for correction of the temperature characteristics of the magnetic detecting element, the magnetic detecting element and the temperature detecting element being built therein. A control device for the actuator acquires both the temperature-corrected position of the shaft and the intra-sensor temperature from the position sensor, and uses them for control of the actuator.

Abstract: A control device for a WG actuator includes a feedback control unit for performing feedback control on the WG actuator in such a way that the position of a shaft detected by a position sensor gets close to a target position, and an abnormality detecting unit for providing an instruction to move the shaft in an axial direction for the feedback control unit, and for detecting an abnormality in the WG actuator on the basis of a result of a movement of the shaft, the movement being detected by the position sensor while the feedback control unit performs the instruction.

Abstract: A control device for an actuator learns a reference position of a shaft when the operation of the engine of a vehicle is not obstructed in a period during which the engine is operating, and performs feedback control by using the reference position learned thereby in such a way that the position of the shaft detected by a position sensor gets close to a target position.

Abstract: A position sensor mounted in an actuator includes a magnetic detecting element for detecting the position of a shaft, and a temperature detecting element for detecting intra-sensor temperature which is used for correction of the temperature characteristics of the magnetic detecting element, the magnetic detecting element and the temperature detecting element being built therein. A control device for the actuator acquires both the temperature-corrected position of the shaft and the intra-sensor temperature from the position sensor, and uses them for control of the actuator.

Abstract: A wastegate actuator includes a direct-current motor, a shaft for opening and closing a wastegate valve of a turbocharger, and a screw mechanism for converting a rotary motion of the direct-current motor into a linear motion of the shaft, and the screw mechanism has a lead angle in accordance with a current of the direct-current motor that is required to hold the shaft at a position.

Abstract: A control device for a WG actuator includes a feedback control unit for performing feedback control on the WG actuator in such a way that the position of a shaft detected by a position sensor gets close to a target position, and an abnormality detecting unit for providing an instruction to move the shaft in an axial direction for the feedback control unit, and for detecting an abnormality in the WG actuator on the basis of a result of a movement of the shaft, the movement being detected by the position sensor while the feedback control unit performs the instruction.

Abstract: A permanent magnet 60 for biasing is placed between opposite surfaces of a second stationary magnetic body 20 and a third stationary magnetic body 30, and a range in magnetic flux density detected by a magnetic sensor 50 is changed to thus include zero in the magnetic flux density. A correction and an adjustment of a temperature characteristic and so on of the magnetic sensor 50 are performed in a state of zero in the magnetic flux density.

Abstract: A permanent magnet 60 for biasing is placed between opposite surfaces of a second stationary magnetic body 20 and a third stationary magnetic body 30, and a range in magnetic flux density detected by a magnetic sensor 50 is changed to thus include zero in the magnetic flux density. A correction and an adjustment of a temperature characteristic and so on of the magnetic sensor 50 are performed in a state of zero in the magnetic flux density.

Abstract: A brushless motor position detection device has a set of first Hall elements (main Hall ICs 18 for detecting magnetic pole positions) and a set of second Hall elements (sub-Hall ICs 19 for detecting magnetic pole positions) mounted on a plane facing a magnetic pole position detecting magnet 16 for detecting the position of a rotor 12. They are subjected to offset adjustment and are mounted in such a manner that the difference between the maximum value of the magnetic flux density at the mounting positions of the first Hall elements and the maximum value of the magnetic flux density at the mounting positions of the second Hall elements is held within a prescribed limit (mounted in such a manner as to have the offset of a prescribed machine angle in the circumferential direction) to bring the detection accuracy of the plurality of sets of the Hall elements into agreement.

Abstract: A motor positioning structure is constructed by providing a plurality of positioning pins 28, 29 for positioning a circuit board 22 on a case 21 of a circuit main body 3 and also providing receiving holes 35, 36 for receiving the positioning pins 28, 29 in a frame 4 on the side of a stator in a motor main body 2.

Abstract: A connecting structure includes a pin 32 which has a shoulder 32c adapted such that the diameter of a portion 32a to be fitted to a link plate 31 is formed larger than that of a portion 32b to be fitted to a joint 30 or a lever 2, and of which the tip portion 32d passing through a hole of the joint or lever is fixed by riveting, and a washer 33 that is disposed between the joint or lever fitted with the pin, and the link plate, and that is pressed and fixed against the joint or lever by the shoulder of the pin when the tip portion of the pin is riveted.

Abstract: An actuator having an output axis which is moved linearly by a rotatory force, and a boss for holding the above-mentioned output axis in such a way that the output axis can move linearly includes a connecting member for propagating the linear motion of the above-mentioned output axis to an external device. The above-mentioned connecting member is comprised of a joint connected to the above-mentioned output axis, and a link plate having an end rotatably connected to the above-mentioned joint, and another end rotatably connected to the external device. A mechanism for preventing rotation of the above-mentioned output axis is constructed of only a connecting portion for connecting the above-mentioned joint, the above-mentioned link plate, and the above-mentioned external device to one another.

Abstract: A cover ASSY 12 attached to a shaft 9 of a linear actuator 1 includes a nut 12b to be screwed on a male screw section 9b formed at the lower end of the shaft 9; a bottomed cylindrical cover body 12a for protecting a boot 10; and a plate 12c, and the ASSY is constructed such that the bottom of the cover body 12a is welded in a sandwich structure with the plate 12c and the nut 12b.

Abstract: A terminal structure for a vehicle-mounted motor includes a motor body having a motor terminal 28 connected to a coil, and a circuit body 5 holding a circuit board 18 for controlling a rotation of the motor body and is assembled in the motor body, wherein a stress relaxation section 35 is provided in an intermediate of an intermediate conductor 34, in order to reduce stress acting on the intermediate conductor 34 connecting the motor terminal 28 and the circuit board 18 and to thereby improve the conductive reliability of electrical joint.

Abstract: A motor positioning structure is constructed by providing a plurality of positioning pins 28, 29 for positioning a circuit board 22 on a case 21 of a circuit main body 3 and also providing receiving holes 35, 36 for receiving the positioning pins 28, 29 in a frame 4 on the side of a stator in a motor main body 2.

Abstract: A brushless motor position detection device has a set of first Hall elements (main Hall ICs 18 for detecting magnetic pole positions) and a set of second Hall elements (sub-Hall ICs 19 for detecting magnetic pole positions) mounted on a plane facing a magnetic pole position detecting magnet 16 for detecting the position of a rotor 12. They are subjected to offset adjustment and are mounted in such a manner that the difference between the maximum value of the magnetic flux density at the mounting positions of the first Hall elements and the maximum value of the magnetic flux density at the mounting positions of the second Hall elements is held within a prescribed limit (mounted in such a manner as to have the offset of a prescribed machine angle in the circumferential direction) to bring the detection accuracy of the plurality of sets of the Hall elements into agreement.

Abstract: An actuator having an output axis which is moved linearly by a rotatory force, and a boss for holding the above-mentioned output axis in such a way that the output axis can move linearly includes a connecting member for propagating the linear motion of the above-mentioned output axis to an external device. The above-mentioned connecting member is comprised of a joint connected to the above-mentioned output axis, and a link plate having an end rotatably connected to the above-mentioned joint, and another end rotatably connected to the external device. A mechanism for preventing rotation of the above-mentioned output axis is constructed of only a connecting portion for connecting the above-mentioned joint, the above-mentioned link plate, and the above-mentioned external device to one another.

Abstract: An actuator equipped with a boot for preventing an intruder from intruding into the actuator by way of an output axis's surface includes a plate formed in a cylindrical shape, having an end in which a flange to which an end portion of the above-mentioned boot is locked is formed and being fitted to the above-mentioned output axis, and a projection formed on an outer surface of the above-mentioned output axis in such away as to lock the above-mentioned plate. A breathing hole for communicating the interior of the above-mentioned boot with the exterior of the above-mentioned boot is disposed between the above-mentioned output axis and the above-mentioned plate.