Abstract: An aspect of a motor of the invention includes a rotor having a shaft, a stator, a bearing supporting the shaft, a cylindrical motor housing holding the stator and opening to one side, a bearing holder positioned on one side of the stator and holding the bearing, a control circuit board positioned on one side of the bearing holder, a rotation sensor attached to the control circuit board, a control circuit board housing positioned on one side of the motor housing and housing the control circuit board, a sensor magnet positioned closer to one side than the bearing and attached to the shaft, and a nonmagnetic contamination cover at least a part of which is positioned between the control circuit board and the bearing holder in the axial direction and which covers one side of the shaft, the bearing, and the sensor magnet.

Abstract: Provided is a motor device that makes the influence of noise more equal between two signal processing circuits. A rotation angle sensor has a bias magnet, a magnetic sensor unit, a first signal processing circuit, and a second signal processing circuit. The first signal processing circuit is placed symmetrically with the second signal processing circuit in a longitudinal direction of a substrate with respect to the magnetic sensor unit located on a line extended from a central axis of a rotary shaft. An inverter is also placed symmetrically with an inverter in the longitudinal direction of the substrate with respect to the magnetic sensor unit.

Abstract: A sensor includes a first support portion, a second support portion, an incremental encoder, a magnetic-flux generating source, and a magnetoelectric transducer. The incremental encoder includes a scale supported by the first support portion and a head supported by the second support portion. The magnetic-flux generating source is supported by one of the first support portion and the second support portion. The magnetoelectric transducer is supported by another of the first support portion and the second support portion.

Abstract: Provided is a magnet device for use with a position sensor. The magnet device has a magnetizing direction and has magnetic field intensity components in the magnetizing direction. The magnet device is formed with a groove recessed in the magnetizing direction, so that the magnetic field intensity components are substantially equal in the transverse direction of the magnetizing direction. The present invention further discloses a magnet assembly including the magnet device for use with a position sensor and a sensing system including the magnet assembly, particularly a neutral position sensor. The axial measuring length of a transmission shaft is prolonged with the length of the magnet device remains unchanged to meet the requirements of different customers, and the reliability of the sensing system is improved.

Abstract: A device for detecting a position of a position indicator includes an electrical magnetic field source, a sensor and an evaluator. The electrical magnetic field source is configured to generate a magnetic field when an electrical current flows through the electrical magnetic field source. The sensor is configured to detect the magnetic field and provide sensor signals based on the magnetic field detected, the sensor having at least two sensors each of which is configured to detect a spatial direction component of the magnetic field and output a signal corresponding to the spatial direction component. The evaluator is configured to receive the sensor signals and determine the position of a position indicator based on the sensor signals when the magnetic field in the surroundings of the electrical magnetic field source is influenced by the position indicator.

Abstract: A motor control system for a permanent magnet synchronous motor (PMSM) uses two linear Hall devices to produce a first signal indicative of a strength of a first magnetic field component produced by a set of rotor magnets and to simultaneously produce a second signal indicative of a strength of second magnetic field component produced by the rotor magnets that is approximately orthogonal to the first magnetic field component. An angular position and angular velocity of the rotor is calculated based on the first signal and the second signal. A plurality of phase signals is produced based on the calculated angular position and angular velocity. Current in a plurality of field windings of the motor is controlled using the plurality of phase signals.

Abstract: A position sensing system for measuring a position of a moving object includes a first magnetic sensor configured to measure an intensity of a magnetic field produced by the moving object. The system includes a controller configured to estimate a position of the moving object based on a nonlinear model of the magnetic field produced by the moving object as a function of position around the moving object, and based on the measured intensity of the magnetic field produced by the moving object.

Abstract: A rotation detection device includes a rotatable body having a tooth tip and a tooth bottom on planes normal to a rotation axis direction, a magnet forming a magnetic field toward the tooth surfaces of the tooth tip and bottom, a magnetic detection element disposed between the rotatable body and the magnet and other than on the rotation axis of the rotatable body, and detecting the magnetic flux densities in the rotation axis direction of the rotatable body at at least two positions, and a magnetic sensor having a signal processor for calculating the rotation angle of the rotatable body according to difference between the magnetic flux densities in the rotation axis direction detected at two positions and difference between the magnetic flux densities in the direction perpendicular to the rotation axis direction and a radial direction of the rotatable body detected at two positions by the magnetic detection element.

Abstract: The magnetic sensor includes a semiconductor substrate having Hall elements on a front surface of the semiconductor substrate, an adhesive layer formed on a back surface of the semiconductor substrate, and a magnetic flux converging plate formed on the adhesive layer. The magnetic flux converging plate is formed on the back surface of the semiconductor substrate through formation of the magnetic flux converging plate by electroplating on a base conductive layer formed on a plating substrate prepared separately from the semiconductor substrate, application of an adhesive for forming the adhesive layer onto a surface of the magnetic flux converging plate so that the magnetic flux converging plate adheres to the back surface of the semiconductor substrate, and peeling off of the plating substrate afterward from the base conductive layer formed on the magnetic flux converging plate.

Abstract: A device for measuring an angular position, comprising a rotating body (3) that oscillates relative to a supporting body (2) between two limit positions which are rotated one relative to the other by an angle of oscillation ? with amplitude that is less than or equal to 150°, a permanent magnet (5) that extends along an arc of extension that corresponds to an arc of a circle centred on the main axis of rotation (4), the arc of extension subtending an angle of extension ?, and a magnetic sensor (6) positioned eccentrically relative to the main axis of rotation (4); the permanent magnet (5) and the magnetic sensor (6) being fixed one to the rotating body (3) and the other to the supporting body (2), and always being magnetically coupled; the following relation applying between the angle of extension ? of the permanent magnet (5) and the angle of oscillation ?: ?>??30°, and the permanent magnet (5) being diametrally polarized and having a direction of polarization (12) that forms an angle that is less than

Abstract: Rotational angle sensor systems and methods are provided for detecting an angular position of a movable structure. The movable structure may be configured to rotate about an axis of rotation between a first rotational position and a second rotational position. A magnet may have a magnetic field pattern with a magnetic field orientation and an angle sensor may be configured to detect the magnetic field pattern and generate one or more signals, based on the magnetic field orientation, corresponding to a rotational position of the movable structure. Additionally, a first one of the magnet and the angle sensor is configured to rotate about the axis of rotation relative to a second one of the magnet and the angle sensor that is rotationally fixed such that the magnetic field orientation changes relative to the angle sensor as the movable structure rotates about the axis of rotation.

Abstract: Methods and systems are described for operating an intra-oral imaging sensor that includes a housing, an image sensing component at least partially housed within the housing, and a temperature sensor. An output of the temperature indicative of a sensed temperature is received and evaluated to determine whether the intra-oral imaging sensor is positioned in the mouth of the patient. The determination of whether the temperature sensor may be based on one or more determined conditions including whether a current temperature exceeds a threshold, whether a first derivative of the sensed temperature exceeds a rate-of-change threshold, and whether a second derivative of the sensed temperature exceeds a temperature acceleration threshold. In some implementations, the operation of the intra-oral imaging sensor is automatically adjusted in response to a determination that the sensor has been placed inside the mouth of a patient.

Abstract: A magnetic position sensing system includes at least one annular magnet mounted to a surface of a rotating body. The annular magnet includes a first end, a second end, an inner diameter surface, and an outer diameter surface. The inner diameter surface and outer diameter surface define a radial thickness therebetween, and the radial thickness varies from the first end to the second end.

Abstract: Provided herein are improved magnetic sensor systems for use in linear measurement systems. A magnetic sensor can be positioned offset from a center line positioned between two magnets. The two magnets can be oriented so as to provide opposite polarities. As the magnetic sensor traverses a path parallel to the magnets and parallel to the center line, the sensor can detect a magnetic flux density provided by the two magnets. Offsetting the magnetic sensor from the center line can improve the linear range of the magnetic sensor, thereby improving the reliability and accuracy of an output signal generated by the magnetic sensor based on the detected magnetic flux density.

Abstract: A lens driving device is provided, including a base, a holder, a first driving mechanism disposed on the first side of the base, a second driving mechanism disposed on the second side of the base opposite the first side, and a conductive member disposed on the base. The holder is configured to sustain a lens. The first driving mechanism is configured to force the holder to move along the optical axis of the lens. The second driving mechanism includes a circuit board assembly and a shape memory alloy (SMA) wire assembly configured to force the base to move in the plane perpendicular to the optical axis. The conductive member and the circuit board assembly are connected at an electrical connection point, and the SMA wire assembly is closer to the light-incident end of the lens with respect to the electrical connection point.

Abstract: To provide a displacement detection device that detects a displacement of a measuring object housed in a casing without changing the design of the casing or while suppressing the design change of the casing. A displacement detection device includes a pair of magnets arranged outside an injector body housing a needle with a space between the magnets and forming a magnetic field in the space, a soft magnetic material connected to the needle inside the injector body and displaced in accordance with the displacement of the needle and disposed in the magnetic field formed by the pair of magnets, and a sensor disposed outside the injector body and in the magnetic field formed by the pair of magnets, and detecting a change in magnetic flux density in accordance with the displacement of the soft magnetic material.

Abstract: A magnet assembly in an electric drive having a shaft. The assembly includes a permanent magnet bonded in plastic and having two protrusions. An adapter has two protrusions and two recesses. The end face of the shaft has two cavities, which receive the two adapter protrusions to mount the adapter to the shaft. The two protrusions of the magnet are received in the recesses in the adapter in order to mount the magnet to the adapter. In another embodiment the shaft has an outer circumferential surface. Here, the adapter has a recess of a first shape and a second recess for mounting the adapter onto the outer circumferential surface of the shaft and the permanent magnet has a protrusion shaped to mate with the first shape of the first recess in the adapter, and the first recess is configured to receive the protrusion to mount the magnet to the adapter.

Abstract: A device has magnetic sensors and magnets in an array on a flexible substrate. Each magnetic sensor is sensitive to immediately proximate magnets. At least one controller evaluates magnetic sensor signals from the magnetic sensors produced in response to deformation of the flexible substrate.

Abstract: Embodiments related to the generation of magnetic bias fields for magnetic sensing are described and depicted. In one embodiment, a sensor includes at least one magnetosensitive element, and a magnetic body with an opening, the magnetic body comprising magnetic material, the magnetic body having inclined surface sections shaped by the opening, wherein the sensor is arranged within the opening such that the magnetosensitive element is in lateral directions bounded by the inclined surface sections.

Abstract: A displacement sensor includes first detection units that detect an amount of displacement of a same detection target, and are disposed such that detection surfaces for detecting the amount of displacement face each other; second detection units that detect an amount of displacement of the detection target which is the same as the detection target of the first detection units, and are disposed such that detection surfaces for detecting the amount of displacement face each other; and a lead frame including a main frame having one surface on which the first detection units are disposed and the other surface on which the second detection units are disposed, and a sub frame which is wire-bonded to electrodes provided on each detection surface of the first detection units and the pair of second detection units.

Abstract: An access cover to underground city infrastructure, particularly a cast iron or a cast iron-concrete cover provided with a cover detection sensor connected with a radio frequency signal transmitting antenna through a transmitter, characterized in that an antenna module (1) provided with a housing made of a material neutral to electromagnetic fields, preferably made of plastic, is installed in the through channel or hole (4) with variable cross-section, and removably fixed at the bottom to a sensor module (2) located underneath the bottom of the cover (3), provided with a battery powered, low current electronic system containing a radio transmitter and an acceleration sensor or a gyroscope and an appropriate controller which detects changes to the position of cover (3) in space and in time, whereby the surface area of the sensor module (2) is greater than the surface area of the through channel or hole (4).

Abstract: A system for enabling an engine to be safely cranked may include a single cranking relay configured to enable the engine to be cranked when activated, a contactless angle sensor for detecting a gear state of a transmission connected with the engine, and a controller. The controller may be configured to check the gear state of the transmission detected by the angle sensor and may allow for activation of the cranking relay when the gear state of the transmission is at one of a Neutral gear state or a Park gear state.

Abstract: An electromechanical actuator includes a ground arm, an output arm rotatable about an axis of rotation relative to the ground arm and a position sensing arrangement to determine an angular position of the output arm relative to the ground arm. The position sensing arrangement includes a position sensor fixed at the ground arm. The position sensor is configured to sense magnetic reluctance. A sensed portion is located at the output arm proximate to the position sensor. The sensed portion includes a geometric variation in an output arm surface configured to vary a magnetic reluctance sensed at the position sensor as a function of angular position of the output arm relative to the ground arm.

Abstract: A position sensing system for measuring a position of a moving object includes a first magnetic sensor configured to measure an intensity of a magnetic field produced by the moving object. The system includes a controller configured to estimate a position of the moving object based on a nonlinear model of the magnetic field produced by the moving object as a function of position around the moving object, and based on the measured intensity of the magnetic field produced by the moving object.

Abstract: A position detector is disclosed that is capable of operating in an autonomous mode or non-autonomous mode. As an example, in the autonomous mode, the position detector is not supplied with external energy, but rather receives energy from a Wiegand module thereby enabling the position detector to obtain information about movement of an object.

Abstract: The present disclosure relates to an absolute position sensor. In one example, the absolute position sensor includes a Wiegand module and a control electronic that enable the absolute position sensor to operate in either a non-autonomous mode or an autonomous mode. In the autonomous mode there is no external energy available and a position sensor is supplied with energy by the Wiegand module.

Abstract: In one aspect, an integrated circuit (IC) includes a first magnetic field sensor configured to sense a ring magnet, a second magnetic field sensor configured to sense the ring magnet and processing circuitry configured to receive a first signal from the first magnetic field sensor and to receive a second signal from the second magnetic field sensor. The processing circuitry is further configured to control an on/off state of at least one light emitting diode (LED) and brightness of the LED based on movement and position of the ring magnet with respect to the first and second magnetic field sensors.

Abstract: Methods and systems are described for operating an intra-oral imaging sensor that includes a housing, an image sensing component at least partially housed within the housing, and a magnetometer at least partially housed within the housing. An output of the magnetometer indicative of an actual magnetic field that impinges the intra-oral imaging sensor is compared to data indicative of a first expected magnetic field. In response to determining, based on the comparison, that the actual magnetic field matches the first expected magnetic field, the electronic processor alters the operation of the imaging system. In some embodiments, the electronic processor causes the intra-oral imaging sensor to operate in a low-power state in response to determining that the actual magnetic field matches a first expected magnetic field indicative of placement of the intra-oral imaging sensor in an imaging sensor storage compartment.

Abstract: A rotation detecting device includes a plurality of magnetic field generating portions; a magnetic member; a coil wound around the magnetic member; and a magnetic field introducing portion. The magnetic field introducing portion introduces a magnetic flux generated by the magnetic field generating portion to pass through the magnetic member when the magnetic field generating portion passes through a specific location.

Abstract: A method of forming a 3D Hall effect sensor and the resulting device are provided. Embodiments include forming a p-type well in a substrate; forming a first n-type well in a first region surrounded by the p-type well in top view; forming a second n-type well in a second region surrounding the p-type well; implanting n-type dopant in the first and second n-type wells; and implanting p-type dopant in the p-type well and the first n-type well.

Abstract: A method for detecting a phase angle difference between a first periodic measurement signal and a second periodic measurement signal, wherein, for the purpose of determining a torque applied to a shaft, the two periodic measurement signals describe a rotation of the shaft at an axial distance from one another including superimposing a periodic auxiliary signal which simulates a previously known rotational speed for the shaft on the first periodic measurement signal in order to form a superimposition signal, and determining the phase angle difference on the basis of the superimposition signal and the second measurement signal.

Abstract: The invention relates to a counting sensor for counting the number of revolutions or of linear displacements of an object, wherein the counting sensor comprises: one single Wiegand module; at least one sensor element; a processing electronics connected to the sensor element; and a permanent magnet arrangement, which is movable relative to the Wiegand module; wherein the processing electronics is configured to obtain (i) direction informations indicating whether the permanent magnet arrangement moves in one direction or an opposite direction, and (ii) magnetic pole informations; and a data storage for storing a value, which indicates the number of the revolutions or of the linear displacements; wherein the processing electronics is configured: (i) to determine, on the basis of the direction information and the magnetic pole information, the number of the revolutions or of the linear displacements of the object and to store the corresponding value in the data storage, (ii) to perform, on the basis of a seque

Abstract: A rotational movement detection device includes a rotating member including a through hole passing therethrough from a first surface to a second surface opposite the first surface, the rotating member rotating around the through hole to generate a magnetic field around the rotating member, a rotation angle detection part that detects a rotation angle of the rotating member, a movement detection part that detects a movement along a rotational axis of the rotating member, and a holding part including a guide part and an arrangement part formed integrally therein, the guide part being inserted into the through hole to guide the rotation of the rotating member and to hold the rotating member, the arrangement part having thereon the movement detection part arranged facing a side surface of the rotating member.

Abstract: In a magnet assembly, and an angle detection system embodying such a magnet assembly, for detecting a rotational angle of a rotating shaft, first and second magnet portions are mounted on the shaft, and have geometrical shapes and respective magnetizations with various symmetry features.

Abstract: A camera module including a housing; a lens barrel having a lens and reciprocating in the housing; a magnetic member coupled with the lens barrel; an electromagnetic member coupled with the housing and generating a magnetic field so that the lens barrel moves along an optical axis; and a Hall sensor in the housing and detecting a change in magnetic field according to a position of the magnetic member before electric power is outputted to the electromagnetic member. A control unit sets a current position of the magnetic member as a first target position, setting an initial position for driving auto focusing as a second target position, aligning the lens barrel to the first target position by controlling electric power supplied to the electromagnetic member, and then moving the lens barrel to the second target position by supplying electric power to the electromagnetic member.

Abstract: Apparatuses, methods and systems for an event-triggering apparatus are disclosed. One embodiment of the apparatus includes a sensor element operative to sensing a magnetic field, and apparatus control circuitry, wherein the apparatus control circuitry receives a representation of the sensed magnetic field. The apparatus control circuitry is operative to sense a deviation in the sensed magnetic field greater than a predetermined threshold, and trigger an event after sensing the deviation of the sensed magnetic field greater than the predetermined threshold.

Abstract: A throttle pedal assembly comprises a housing having a first and second side, top, bottom, front and back walls; a main chamber open to the front and bottom of the housing and a sensor cavity. A pedal assembly comprises a pedal, a pedal arm, and a head at an end of the pedal arm rotatable a pivot axis. A magnet is operatively connected to the pedal assembly to rotate on the pivot axis as the pedal assembly rotates about the pivot axis. A Hall effect sensor assembly mounted in the sensor cavity to be proximate the magnet yet separated from the magnet. The cavity and Hall effect sensor assembly are respectively shaped and sized such that the Hall chip and the magnet lay on a common axis such that the Hall chip and the magnet are coaxially aligned. The sensor cavity is sealed to prevent contaminants from entering the cavity.

Abstract: The invention relates to measurement technology and is used to determine the absolute displacements of objects in metallurgy, automotive industry, warehouse and production logistics, and in the automation of production. The technical result is achieved when the following steps are performed: the displacement transducer is mounted on the object; signal sources are mounted along the trajectory of the object displacement; on each section of the trajectory, an arrangement of the signal sources is provided which is determined by changing the number of signal sources and/or the distance between any two signal sources; a signal is sent to the moving object with transducer; an output signal is received from the transducer regarding the location of the signal sources located within the measurement range; the object location is determined; furthermore, the displacement is measured at a distance exceeding the length of the active zone of the transducer.

Abstract: A position detector includes a magnet disposed between first ends of first and second magnetic flux transmission parts and a magnet disposed between second ends of the first and second magnetic flux transmission parts. The position detector also includes a Hall IC that is positioned within a gap and moves relative to a rotating body. The Hall IC detects a density of the magnetic flux from the first and second magnetic flux transmission parts and outputs a signal according to the density of the magnetic flux passing therethrough in order to detect a position of a detection object. A minimum magnetic flux density position within the gap may be shifted to a position having the highest detection accuracy such that the position detection accuracy of the detection object is improved.

Abstract: A magnetic field sensor and an associated method use one or more magnetoresistance elements driven with an AC mixing current and experiencing an AC mixing magnetic field to generate a DC voltage signal or a DC voltage signal component related to a slope of a transfer curve of the one or more magnetoresistance elements.

Abstract: A relative angle sensor includes a stator unit, a magnet unit, and a collector unit. The stator unit includes a stator shaft coupled to and disposed between an upper stator ring and a lower stator ring. Each of the stator rings includes a plurality of teeth with slots defined between adjacent teeth. The stator unit defines a channel between the upper and lower stator rings and outside of the stator shaft. The magnet unit is disposed in the channel and includes at least one magnet. The magnet unit and/or the stator unit is configured to rotate relative to the other of the magnet unit or the stator unit. The collector unit is configured to receive magnetic flux routed from the magnet unit. The magnetic flux routed through the collector unit is responsive to a relative rotational position between the magnet unit and the stator unit.

Abstract: A back-biased magnetic field sensor uses one or more magnetic field sensing elements upon a substrate, each outside of a substrate region in which magnetic field lines are near perpendicular to the substrate and outside of which magnetic field lines are not to the substrate. The back-biased magnetic field sensor can sense an approaching and/or a retreating ferromagnetic object.

Abstract: An electronic comparison circuit can identify at least three conditions of an input signal received by the electronic comparison circuit. A first one of the at least three conditions occurs when a value of the input signal is less than a first threshold value, a second one of the at least three conditions occurs when a value of the input signal is greater than the first threshold value and less than a second threshold value, and a third one of the at least three conditions occurs when a value of the input signal is greater than the second threshold value. A magnetic field sensor can use the electronic comparison circuit.

Abstract: A rotation detection device for detection of rotation of a vehicle pedal (2) around an axis of rotation, comprising a movable first part, which accompanies the rotational motion of the pedal, a stationary second part, a magnetic field sensing component arranged in the first or in the second part and a magnetic element arranged in that part of the first or the second part that does not comprise the magnetic field sensing component when the first and the second part are moving in relation to each other. The first part comprises a base part and at least one arm protruding from the base part, where at least one arm at least partly surrounds the second part.

Abstract: The invention concerns an angle sensor and a method of measuring an angle of a magnetic field. The angle sensor is configured to measure a direction of a magnetic field in a plane, comprising a first magnetic field sensor having a first sensitivity direction and delivering a first voltage, a second magnetic field sensor having a second sensitivity direction and delivering a second voltage, a first current source supplying a first biasing current to the first magnetic field sensor, a second current source supplying a second biasing current to the second magnetic field sensor (2), and electronic circuitry configured to adjust the first biasing current and the second biasing current in such a manner that a sum of the first voltage and the second voltage equals 0.

Abstract: A detection device including a base, a bracket, a swing lever, a first limit lever and a first magnetic sensor is disclosed. The bracket is on the base, the swing lever is swingably on the bracket via a swing shaft and the swing lever is partitioned as a toggle section and a trigger section by the swing shaft, the weight of the trigger section being greater than that of the toggle section. An end of the trigger section is provided with a magnet, and an end of the toggle section is higher in an initial state than an upper edge of the bracket. The first limit lever is on the bracket for limiting the trigger section. The first magnetic sensor is on the bracket and in the vicinity of a virtual extension of the trigger section when the trigger section is limited by the first limit lever.

Abstract: Methods and apparatus for positioning a magnetic field sensor IC package having a first channel for a planar magnetic field sensing element and a second channel for vertical magnetic field sensing element in relation to an axis of a ring magnet to provide a desired phase relationship between the first and second channels. In embodiments, positioning the sensor includes an offset angle and a displacement with respect to a centerline of the ring magnet.

Abstract: A rotational angle sensor for determining an angular position of a reference component with respect to an axial direction includes a magnet retaining component having a magnet. The magnet retaining component is connectable to the reference component via an interference-fit connection so as to rotate with the reference component while being axially displaceable relative to the reference component. The rotational angle sensor also includes a sensor attached to the reference component such that it can rotate with respect to the reference component, and the sensor is configured to detect a magnetic field generated by the magnet. Also included is a spring element configured to exert an axial force on the magnet retaining component so that an axial spacing between the sensor and the magnet assumes a predetermined value.

Abstract: A Halbach array is formed from first to third magnets provided to a rotor. Of shortest straight-line distances (clearance distances) between the first to third magnets and a Hall element as facing the first to third magnets after moving relative to the first to third magnets, the shortest straight-line distance between the second magnet and the Hall element is set the longest. In other words, the second magnet is placed at a position offset from the first magnet. In addition, the second magnet may be offset from the third magnet.

Abstract: The axial direction of a worm wheel is defined as a motor short-transverse direction, and a plane orthogonal to the motor short-transverse direction is defined as a motor flat plane. An imaginary plane contacting a first end of a sensor magnet in a motor short-transverse direction and parallel with the flat plane is defined as a first imaginary plane. An imaginary plane contacting a second end of the sensor magnet in the motor short-transverse direction and parallel with the flat plane is defined as a second imaginary plane. A control circuit board is provided with a rotation detecting element that detects rotation of the rotary shaft of the motor. The control circuit board is arranged to be parallel with or inclined relative to the flat plane, and is provided between the first and second imaginary planes.