A rotor of a motor includes first and second rotor cores, a field magnet, and a commutator magnet. The first and second rotor cores each include a core base and a plurality of claw poles. The claw poles of the first rotor core and the claw poles of the second rotor core are alternately arranged in a circumferential direction. The field magnet is located between the core bases. The field magnet is magnetized in an axial direction so that the claw poles of the first rotor core and the claw poles of the second rotor core function as different magnetic poles in the circumferential direction. The commutator magnet is located on an outer circumference of the field magnet around the claw poles. The commutator magnet is magnetized so that surfaces having the same polarity face each other between the claw poles and the commutator magnet.

An electric machine includes a stator with stator slots securing therein electrically conductive windings. A rotor is rotatably mounted adjacent the stator and includes a stack of rotor laminates. Each laminate includes circumferentially spaced poles, each of which includes a magnet slot spaced from an insert slot. These laminate magnet slots cooperatively define the rotor's magnet slots. Likewise, the laminates' insert slots cooperatively define the rotor's insert slots. Magnets are mounted inside the rotor's magnet slots, and non-magnetic inserts are mounted inside the rotor's insert slots. One or more poles of each laminate includes a structural web that extends radially through the magnet and insert slots of that pole. Multiple poles of each rotor laminate lack a radially extending structural web. Each rotor laminate is rotated with respect to a neighboring rotor laminate such that each pole with a structural web axially aligns with a pole without a structural web.

A molding-on tool for producing a rotor, the rotor having a plurality of stacks, which are stacked one over the other in the axial direction and each have a magnet carrier and a plurality of magnets fastened thereto. Plastic is molded onto the magnets in order to fix the position on the magnet carrier, the molding-on tool having at least two molding-on plates, which are provided for feeding plastic in order to mold plastic onto the magnets.

A motor includes a rotor and a stator. In a plane orthogonal to an axis direction of the rotor, the motor satisfies W2<W1<M1, and T1<W1<T1+2×T2, where M1 is a width of a surface of a permanent magnet, W1 is a maximum width of a portion of an inner wall of a first magnet insertion hole in contact with the surface, W2 is a minimum width from the first magnet insertion hole to a second magnet insertion hole, T1 is a width of a first front end surface of a first tooth, and T2 is a width from the first front end surface to a second front end surface of a second tooth.

The present invention is a variable air gap in a rotary electric machine, notably a permanent magnet-assisted synchronous reluctance electric machine.

An electric machine includes a stator defining a rotor chamber. A rotor is disposed within the chamber and is configured to rotate about a central axis. The rotor includes a plurality of stacked laminations to form a rotor core. The rotor core has an outer diameter and each of the laminations includes a plurality of magnet slots that are radially spaced apart from the outer diameter and angled inwardly with one end of each magnet slot adjacent to the outer diameter. Each magnet slot has a permanent magnet disposed therein, adjacent pairs of the ferrite permanent magnets defining poles for the rotor. Each magnet slot has two opposite ends that define inner and outer magnet free areas. The outer magnet free areas are adjacent the rotor outer diameter and the inner magnet free areas are radially inwardly positioned. Each outer magnet free area is provided with conductive material.

The torque of a permanent magnet motor is increased. There is provided a permanent magnet type motor with concentrated windings, in which each stator pole has a circumferential pitch of 185° or more in an electric angle. In this motor, the circumferential distribution of the magnetic flux density in an air gap surface of the rotor poles PR of the permanent magnet type has an approximately trapezoidal shape. Moreover, the induced voltages of the concentrated windings of the stator have an approximately trapezoidal waveform. An approximately trapezoidal-shaped waveform current is energized in the concentrated winding of each phase. Even if the magnetic flux density is close to the maximum flux density of the soft magnetic member of the stator, large slot cross-sectional areas of the stator can be secured, thus outputting a large torque.

An electric motor is provided including a rotor and an outer member that is coaxially placed around the inner member and having radially oriented teeth. The teeth have end parts with a width Wt, adjacent teeth being separated by a slot of slot width Wg. A number of barrier members are provided in the inner member near the inner perimeter, each barrier member having a width Wb that generally corresponds to the width Wt and having curved side sections at each end of the central section having a width that generally corresponds with the slot width Wg. The barrier members reduce electromagnetic NVH by preventing magnetic flux from passing from the slots on each side of the teeth, into the inner member.

A salient pole type hybrid excitation motor, belonging to the field of motors, and including a rotor assembly, where the rotor assembly includes: an electromagnetic rotor with radial salient poles and constructed in an annular shape and sleeving a magnetic yoke; a permanent magnet rotor installed on one side of the electromagnetic rotor; and axial salient pole blocks installed on one side of the permanent magnet rotor away from the electromagnetic rotor and arranged alternately with the radial salient poles, a plurality of axial salient pole blocks being matched with a plurality of radial salient poles of the electromagnetic rotor, and a polarity of the axial salient pole blocks being opposite to that of permanent magnet steels corresponding to the radial salient poles of the electromagnetic rotor. Electric excitation and permanent magnet excitation are combined to adjust an air gap magnetic field of a motor.

A rotor core includes a magnet pocket defined by the rotor core and extending longitudinally in an axial direction of the rotor core. The rotor core also includes a magnet structure disposed within the magnet pocket and extending transversely in a radial direction and/or circumferential direction of the rotor core to define a magnet width, the magnet structure extending longitudinally in the axial direction of the rotor core, wherein the magnet structure has a varied axial length.