A molding is formed by laminating an aggregate of SiC and a paste containing Si and C powders on an epitaxial layer of SiC formed on a support substrate of SiC to form an intermediate sintered body in which polycrystalline SiC is produced from the Si and C powders by reaction sintering, free Si is carbonized to SiC to form a sintered body layer, and the support substrate is removed from the epitaxial layer to form a semiconductor substrate in which the epitaxial layer and the sintered body layer are laminated.

Provided is a motor unit structure suitable for automating work in which a gear is attached to a motor shaft. The motor unit structure comprises: a motor 20 having a key 24 at a distal end of a motor shaft 22; and a gear 30 that includes a key groove into which the key 24 is inserted and an axle hole penetrating along the axial direction, the distal end of the motor shaft 22 being mated with the axle hole. The axle hole has: a mating section that is formed on the tail end side of the axle hole in the direction in which the motor shaft 22 is inserted and that mates with the motor shaft 22 inserted into the axle hole; and a non-mating section that is formed on the distal end side of the axle hole in the direction in which the motor shaft 22 is inserted and that does not mate with the motor shaft 22 inserted into the axle hole.

Provided is a motor unit structure suitable for automating work in which a gear is attached to a motor shaft. The motor unit structure comprises: a motor 20 having a key 24 at a distal end of a motor shaft 22; and a gear 30 that includes a key groove into which the key 24 is inserted and an axle hole penetrating along the axial direction, the distal end of the motor shaft 22 being mated with the axle hole. The axle hole has: a mating section that is formed on the tail end side of the axle hole in the direction in which the motor shaft 22 is inserted and that mates with the motor shaft 22 inserted into the axle hole; and a non-mating section that is formed on the distal end side of the axle hole in the direction in which the motor shaft 22 is inserted and that does not mate with the motor shaft 22 inserted into the axle hole.

An electric motor includes a stator and a rotor. The stator carries a plurality of phase windings. The rotor carries a plurality of magnet poles and is connected to a shaft. The stator includes an outer annular yoke and a plurality of discrete teeth that are separate from the annular yoke. Each tooth has a stem and a tooth tip that is located at the end of the stem closest to the roto. An inner annular sleeve is located in what is otherwise an airgap between the inwardly facing tips of the stator teeth and the rotor. The inner sleeve includes location features that positively locate and support the teeth by the tips.

An electric motor includes a stator and a rotor. The stator carries a plurality of phase windings. The rotor carries a plurality of magnet poles and is connected to a shaft. The stator includes an outer annular yoke and a plurality of discrete teeth that are separate from the annular yoke. Each tooth has a stem and a tooth tip that is located at the end of the stem closest to the roto. An inner annular sleeve is located in what is otherwise an airgap between the inwardly facing tips of the stator teeth and the rotor. The inner sleeve includes location features that positively locate and support the teeth by the tips.

A method of manufacturing a motor includes accommodating a stator in a case; inserting a fixing member having a rod shape into a circular ring of a collar member and a through hole formed in the stator, the collar member including the circular ring formed in an annular shape and a claw extending in a radial direction of the circular ring; positioning the stator relative to the case by bringing a tip of the claw into contact with an inner surface of the case; and fixing the stator to the case by tightening the fixing member such that the fixing member moves along an axial direction to deform the claw. When the stator is fixed to the case by the fixing member, the claw is not in contact with the inner surface of the case.

A method of manufacturing a motor includes accommodating a stator in a case; inserting a fixing member having a rod shape into a circular ring of a collar member and a through hole formed in the stator, the collar member including the circular ring formed in an annular shape and a claw extending in a radial direction of the circular ring; positioning the stator relative to the case by bringing a tip of the claw into contact with an inner surface of the case; and fixing the stator to the case by tightening the fixing member such that the fixing member moves along an axial direction to deform the claw. When the stator is fixed to the case by the fixing member, the claw is not in contact with the inner surface of the case.

An installation assembly. In installation assembly includes a machine shaft, a second rolling bearing having an inner ring and and an outer ring, for rotatably bearing the machine shaft in a housing block, and a signal transmitter of a rotor position sensor having a transmitter element and a cup-shaped holder for electrical detection of an angle of rotation of the machine shaft. Between a fixing portion of the cup-shaped holder and the circumference of the machine shaft there is an annular gap in which a fastening ring is inserted, using which the signal transmitter is rotationally and axially fastened to the machine shaft. One of the ends of the fastening ring protrudes axially out of the cup-shaped holder and is supported axially on the inner ring of the rolling bearing by this protruding end. A method for installing an installation assembly, and an electrically commutated motor, are also described.

An installation assembly. In installation assembly includes a machine shaft, a second rolling bearing having an inner ring and and an outer ring, for rotatably bearing the machine shaft in a housing block, and a signal transmitter of a rotor position sensor having a transmitter element and a cup-shaped holder for electrical detection of an angle of rotation of the machine shaft. Between a fixing portion of the cup-shaped holder and the circumference of the machine shaft there is an annular gap in which a fastening ring is inserted, using which the signal transmitter is rotationally and axially fastened to the machine shaft. One of the ends of the fastening ring protrudes axially out of the cup-shaped holder and is supported axially on the inner ring of the rolling bearing by this protruding end. A method for installing an installation assembly, and an electrically commutated motor, are also described.

A sealing structure, an inner wheel drive system and a method for assembling a dustproof member in a sealing structure. The sealing structure is used for sealing a radial clearance between a first component and a second component, and comprises a sealing member and a dustproof member, wherein the sealing member is sealed in the radial clearance, the dustproof member is located on an axial outer side of the sealing member, a first end of the dustproof member is fixed on the first component, an opposite second end extends in a radial direction so as to cover the radial clearance, and the second end and the second component are spaced apart and partially overlap with each other in an axial direction. Since the dustproof member is not arranged in the radial clearance, the axial size of the radial clearance is reduced, and axial sizes of the first component and the second component are also accordingly reduced. The sealing structure is especially suitable for the inner wheel drive system, is helpful for reducing the axial size of the inner wheel drive system, and improves the applicability of the inner wheel drive system.