This invention is concerning easily installing an encoder main unit to a disk unit disposed on a shaft, without contacting a light-receiving element and an LED. An encoder installing structure and method using a spigot unit according to this invention are a configuration and method including: a shaft end which is a spigot inserting portion of a motor shaft of a motor; a disk unit which is fitted in an outer periphery of the shaft end so as to be fitted as a first spigot fitting portion and includes a disk; a screw hole which is formed at a shaft center of the shaft end along a shaft direction of the motor shaft.

The bearing provides a first ring and a second ring centered on an axis, each of the first and second rings being provided with an outer cylindrical surface, with an inner cylindrical surface, and with lateral faces that axially delimit the outer and inner cylindrical surface. One of the inner and outer cylindrical surfaces and/or one of the lateral faces of the first ring includes a textured area provided with a groove extending circumferentially and with two protrusions disposed one on each side of the groove and extending along the groove.

A position-measuring device includes a housing having a first portion in the form of a hollow section and extending in a longitudinal direction. The housing includes at least a first passage and a second passage, the first and second passages each extending in the longitudinal direction at least partially through the first portion. A scale is disposed within the housing for being scanned as part of a position measurement. The position-measuring device includes a connecting channel, the first and second passages being interconnected via the connecting channel.

A magnetic detection module is provided so as to be selectively mountable in any of housings having a plurality of specifications having different shapes or sizes of mounting portions, and detects magnetic flux generated in the housing. The magnetic detection module includes one or more magnetic sensors that detect magnetic flux, a case in which the magnetic sensors are housed, and a cap that can be attached to an end of the case and is provided with a sealing member. The magnetic detection module can be attached to the housing of the first specification with the cap not attached to the case, and can be attached to the housing of the second specification through a sealing member with the cap attached to the case.

The present invention provides a sensing device comprising: a rotor; and a stator in which the rotor is disposed, wherein the stator comprises a stator tooth and a stator body, the stator tooth comprises a first stator tooth and a second stator tooth disposed inside the first stator tooth, at least one of the first stator tooth and the second stator tooth includes a tip protruding toward the center axis of the stator, and the tip is disposed at one surface of the stator body.

A mounting structure of a rotating member of an encoder for detecting a phase angle of a magnet provided on a rotor of a motor includes: a rotating shaft configured to be rotated by driving of the motor; the rotating member on which a phase angle detection pattern configured to detect the phase angle is formed; and a boss attached to the rotating member and configured to mount the rotating member to an end of the rotating shaft. In this configuration, the end of the rotating shaft and the boss are provided with a first positioning structure configured to position a mounting position of the boss relative to the rotating shaft about the axis of the rotating shaft.

A magnetic field sensor has a magnet (M1) that produces a magnetic field with a magnetic field axis (f), has a magnet axis (a) and is held in a component (4) that can move about at least one axis and has a component axis (b). Also a method for mounting a magnet (M1) of a magnetic field sensor. The magnet (M1) is held in the component (4) in such a manner that the magnetic field axis (f) coincides, as closely as possible, with the component axis (b). A deviation of the magnetic field axis (f) from the magnet axis (a) is measured, and the angle of deviation (α) is corrected during the mounting of the magnet (M1) in the component (4).

An absolute encoder includes a circuit board disposed away from a rotation shaft of a motor in a shaft direction of the rotation shaft thereof, the circuit board being fixed to top end surfaces of multiple pillars each extending from a motor side, by respective locking sections. The absolute encoder includes a sensor disposed, on the circuit board, facing a rotating body that rotates in accordance with rotation of the rotation shaft, the sensor being configured to detect a rotation amount of the rotating body. The circuit board includes first fixing portions each fixed to a top end surface of a given pillar, by a corresponding locking section. The circuit board includes a second fixing portion fixed to a top end surface of a given pillar by a corresponding locking section, the second fixing portion being connected to a ground. At each of the first fixing portions, an adjustment portion is disposed between the circuit board and a top end portion of a given pillar is provided, the adjustment portion being set to adjust a distance between the circuit board and the top end portion of the given pillar, so that a height of the circuit board at a given first fixing portion is set to be the same as a height of the circuit board at the second fixing portion.

In a magnet holder 4 including: a shaft attachment portion 41 to which a shaft 2 is press-fitted and fixed; and a magnet holding portion 42 that is provided on one side in an axial direction of the shaft attachment portion 41 and holds a periphery of a magnet 5, and provided with an undercut portion 50 that engages with the magnet 5 in the axial direction on an inner peripheral surface 43 of the magnet holding portion 42 facing the magnet 5, the magnet holding portion 42 and the shaft attachment portion 41 are integrally formed of sintered metal, an outer peripheral surface and an end surface of the magnet holding portion 42 and an inner peripheral surface of the shaft attachment portion 41 are sized, and the undercut portion 50 is formed by plastic deformation of the magnet holding portion 42.

A two-piece resolver clamping plate includes a first clamping segment and a second clamping segment. The first clamping segment includes a first arcuate clamping ring and exactly three arcuate clamping arms extending from the first arcuate clamping ring. The second clamping segment includes a second arcuate clamping ring and exactly two arcuate clamping arms extending from the second arcuate clamping ring. In an example embodiment, a first circumferential length of the first arcuate clamping ring is greater than a second circumferential length of the second arcuate clamping ring.