Abstract: An encoder includes: a magnet rotatably supported; a control board including a magnetic field sensor that detects a magnetic field produced by the magnet and outputs a signal, and an arithmetic unit that detects rotation of the magnet on the basis of the output of the magnetic field sensor; a magnetic shielding cover made of a soft magnetic material; an encoder bracket used to fix the magnetic shielding cover; a protective cover fixed with being sandwiched between the magnetic shielding cover and the encoder bracket to cover the magnet and the control board to prevent entry of foreign substances; and a sealing member sandwiched between the protective cover and the encoder bracket. The magnetic shielding cover covers the magnet, the control board, and the protective cover, and the sealing member is compressed between the encoder bracket and the protective cover.

Abstract: An encoder includes: a magnet rotatably supported; a control board including a magnetic field sensor that detects a magnetic field produced by the magnet and outputs a signal, and an arithmetic unit that detects rotation of the magnet on the basis of the output of the magnetic field sensor; a magnetic shielding cover made of a soft magnetic material; an encoder bracket used to fix the magnetic shielding cover; a protective cover fixed with being sandwiched between the magnetic shielding cover and the encoder bracket to cover the magnet and the control board to prevent entry of foreign substances; and a sealing member sandwiched between the protective cover and the encoder bracket. The magnetic shielding cover covers the magnet, the control board, and the protective cover, and the sealing member is compressed between the encoder bracket and the protective cover.

Abstract: A stator includes an insulator, a wire, a stator core, a cylindrical hollow terminal through which the stator is to be electrically connected, and a resinous molding material covering the stator core and an outer face of the hollow terminal. An inner face of the hollow terminal is exposed from the molding material, and a first end of the hollow terminal is open to the outside of the molding material.

Abstract: An electric motor includes a stator and a rotor that is surrounded by the stator and rotates on a shaft. The electric motor includes a detector that detects a rotational position of the shaft and outputs an electrical signal indicative of a detection result, a detector cover housing the detector, a power line that is provided in the electric motor to transmit electric power that drives rotation of the rotor, a signal line that allows in the detector cover propagation of the electrical signal output from the detector, and a connector that is provided to the detector cover and is fitted with an end of the power line and an end of the signal line.

Abstract: A stator includes an insulator, a wire, a stator core, a cylindrical hollow terminal through which the stator is to be electrically connected, and a resinous molding material covering the stator core and an outer face of the hollow terminal. An inner face of the hollow terminal is exposed from the molding material, and a first end of the hollow terminal is open to the outside of the molding material.

Abstract: An electric motor with a brake, having a function as a holding brake, includes a brake resistor including three resistors. In a normal state, the brake resistor is such that the three resistors are connected together at ends on one side and at ends on another side and are connected to a brake DC power supply in parallel to each other. In an emergency or an event of an emergency stop, the brake resistor is such that the three resistors are connected together at the ends on one side to form a Y-connection and the ends on another side that are not connected together are electrically connected to the output end of a stator coil of an electric motor or an end having a potential equal to that of the output end.

Abstract: The electric motor is the electric motor that includes a shaft part that rotates around a rotation shaft and a casing that accommodates at least part of the shaft part. A through hole is formed in the casing at a position that overlaps with the rotation shaft. A set screw is screwed into the through hole so as to close the through hole. An O-ring is interposed between the casing and the set screw so as to suppress intrusion of water and dust into the casing.

Abstract: The electric motor is the electric motor that includes a shaft part that rotates around a rotation shaft and a casing that accommodates at least part of the shaft part. A through hole is formed in the casing at a position that overlaps with the rotation shaft. A set screw is screwed into the through hole so as to close the through hole. An O-ring is interposed between the casing and the set screw so as to suppress intrusion of water and dust into the casing.

Abstract: Provided is a method for fabricating a molded stator of a rotary electric machine, the method comprising: a lamination step of laminating a plurality of core sheets each having a plurality of core pieces connected to one joining portion via bridge portions, thereby forming a divided-laminated-core group structure; a winding step of winding a coil on a teeth portion of each divided laminated core of the divided-laminated-core group structure; a cutting step of cutting the bridge portions, thereby separating the divided laminated cores wound with the coils; a temporary fixing step of temporarily fixing the divided laminated cores circularly arranged to form a stator; and a molding step of placing, in a mold, the stator into which a mold mandrel is inserted along the inner circumferential surface, and molding an outer circumferential surface of the stator with resin.

Abstract: A stator of a rotary electric machine, in which an insulating capacity higher than or equal to an insulating capacity of a flat portion of a stator core can be maintained at edge portions of the stator core. The stator of the rotary electric machine includes a core-sheet laminate that is formed by laminating a plurality of core sheets made of metal plates; a coating film that is made of an insulating paint coated on a surface of the core-sheet laminate; a stator coil that is made of a conductive wire wound around the core-sheet laminate via the coating film; and bobbins made of an insulating material, which are inserted between the coating film and the stator coil and prevent the conductive wire of the stator coil from contacting the coating film that is coated on edge portions of the core-sheet laminate, or relieve pressure caused by the contact.

Abstract: A rotor includes permanent magnets arranged such that magnetic poles of N poles and S poles are arranged alternately in a rotation circumferential direction. The permanent magnets form a plurality of rows in a rotation axis direction. The rotor includes a change section in which arrangements of the magnetic poles change with respect to the rotation axis direction due to the permanent magnets being arranged such that arrangements of the magnetic poles change, in the rotation circumferential direction, between the permanent magnets in the plurality of rows. A stator includes tooth sections opposed to the rotor to surround the rotor, and auxiliary slots each of which is selectively formed at one portion of a front end portion of each tooth section in the rotation axis direction such that substantially a center of the auxiliary slot in the rotation axis direction is opposed to the change section.

Abstract: Provided is a method for fabricating a molded stator of a rotary electric machine, the method comprising: a lamination step of laminating a plurality of core sheets each having a plurality of core pieces connected to one joining portion via bridge portions, thereby forming a divided-laminated-core group structure; a winding step of winding a coil on a teeth portion of each divided laminated core of the divided-laminated-core group structure; a cutting step of cutting the bridge portions, thereby separating the divided laminated cores wound with the coils; a temporary fixing step of temporarily fixing the divided laminated cores circularly arranged to form a stator; and a molding step of placing, in a mold, the stator into which a mold mandrel is inserted along the inner circumferential surface, and molding an outer circumferential surface of the stator with resin.

Abstract: A rotary electric machine comprising a rotor (30A) including a plurality of permanent magnets having magnetic poles and a stator (20A) including a plurality of tooth sections each having a front end portion which faces the rotor, wherein the rotor (30A) has a skew structure having a change section in which boundaries between the magnetic poles change with respect to a rotation axis direction, and the front end portion of each of the plurality of tooth sections of the stator (20A) has an auxiliary slot (24A) which is selectively formed in an extending manner at one portion of the front end portion in the rotation axis direction such that substantially a center of the auxiliary slot in the rotation axis direction is opposed to a center of the change section in the rotation axis direction, and no auxiliary slot is formed at portions located on extensions of the auxiliary slot in the rotation axis direction.