In this stator, a first coil portion, a second coil portion, a third coil portion, and a fourth coil portion each include a one-side coil part that is disposed so as to extend over a first slot and a third slot, and an other-side coil part that is disposed so as to extend over a second slot and a fourth slot.

The present invention relates to electric submersible pumps that have two or more permanent magnet motors and more specifically to such systems wherein permanent magnet motors are aligned using phase and pole alignment marks.

The present invention relates to electric submersible pumps that have two or more permanent magnet motors and more specifically to such systems wherein permanent magnet motors are aligned using phase and pole alignment marks.

A motor (1) has a pair of journal supports (2), between which is journalled a rotor (3) on a shaft (4). The rotor has a disc (5) fast with the shaft and at right angles to it, whereby it rotates without wobble. At the circumference of the disc, a plurality of short, circular cylindrical permanent magnets (6) are provided at the same radial distance (7) from the shaft to their polar axes, tangential to the disc at their mid-point, with their polar axes in the central plane of the disc and the midpoints of the axes on a circular path (9) of radius (7), and equally spaced around the disc with an angular pitch (10) equal to double their polar length (11). A stator (12) carried by the supports on rods (14). It included two formers (15,16).

Provided is an electrically powered tool having an improved sensor substrate mounting structure, the electrically powered tool being configured so that a brushless type motor is axially contained in a cylindrical housing. The electrically powered tool has: a cylindrical housing for axially containing a motor; a control unit for controlling the motor; and a sensor substrate having mounted thereon a plurality of position detecting elements for detecting the rotational position of a rotor. The sensor substrate is gripped between the insulator of the motor and the housing and held on the housing side when axially mounting the motor. The sensor substrate is annularly shaped and has formed at the center thereof a through-hole through which a bearing for the motor is passed. The portion of the sensor substrate, on which a Hall IC is mounted, is provided with a synthetic resin cover member for protecting the Hall IC against dust.

Provided is an electrically powered tool having an improved sensor substrate mounting structure, the electrically powered tool being configured so that a brushless type motor is axially contained in a cylindrical housing. The electrically powered tool has: a cylindrical housing for axially containing a motor; a control unit for controlling the motor; and a sensor substrate having mounted thereon a plurality of position detecting elements for detecting the rotational position of a rotor. The sensor substrate is gripped between the insulator of the motor and the housing and held on the housing side when axially mounting the motor. The sensor substrate is annularly shaped and has formed at the center thereof a through-hole through which a bearing for the motor is passed. The portion of the sensor substrate, on which a Hall IC is mounted, is provided with a synthetic resin cover member for protecting the Hall IC against dust.

An embodiment provides a stator comprising a stator core having a plurality of teeth and coils wound around the teeth, wherein the tooth includes a body around which the coil is wound and a shoe connected to the body, the shoe includes a plurality of grooves and a curvature center of the inner peripheral surface of the shoe is the same as the center of the stator core.

An embodiment provides a stator comprising a stator core having a plurality of teeth and coils wound around the teeth, wherein the tooth includes a body around which the coil is wound and a shoe connected to the body, the shoe includes a plurality of grooves and a curvature center of the inner peripheral surface of the shoe is the same as the center of the stator core.

A multi-degree-of-freedom spherical motor includes a primary frame, a secondary frame, a tertiary frame, a terminal rotor, a first rotating shaft, a second rotating shaft, a third rotating shaft, permanent magnets and electromagnetic coils. The electromagnetic coils are arranged on an inner surface of the primary frame. Two sides at a top portion of the primary frame are symmetrically connected to the secondary frame through the first rotating shaft. The tertiary frame is arranged inside the secondary frame in a non-mechanical contact manner. The terminal rotor and the tertiary frame are connected through the third rotating shaft. The permanent magnets are arranged on one side of the terminal rotor close to the primary frame. The secondary frame and the tertiary frame are connected through the second rotating shaft. The first rotating shaft, the second rotating shaft and the third rotating shaft are perpendicular to each other.

A lamination ring for constructing a laminated rotor core for a rotor of an electric machine and a method for producing a laminated rotor core made of multiple lamination rings for a rotor is disclosed. The lamination ring has multiple receiving openings for permanent magnets, and multiple structural elements are arranged homogeneously in the lamination ring at the same distance to one another in the circumferential direction in a rotated manner by an offset angle relative to the axis of symmetry such that the arrangement of structural elements is not symmetrical relative to the axis of symmetry of the lamination ring.