A rotor includes a rotor core, a first magnet, a second magnet, and a holder made of resin. Both a radially inner surface and a radially outer surface of the first magnet are covered with the rotor core. The second magnet includes a radially inner surface covered with the rotor core, and a radially outer surface exposed from the rotor core. The holder includes a first inner pressing portion and a second inner pressing portion. The first inner pressing portion presses the first magnet radially outward from a radially inner side of the first magnet. The second inner pressing portion presses the second magnet radially outward from a radially inner side of the second magnet. Accordingly, the first magnet and the second magnet are accurately positioned for the rotor core.

A rotor includes a rotor core, a first magnet, a second magnet, and a holder made of resin. Both a radially inner surface and a radially outer surface of the first magnet are covered with the rotor core. The second magnet includes a radially inner surface covered with the rotor core, and a radially outer surface exposed from the rotor core. The holder includes a first inner pressing portion and a second inner pressing portion. The first inner pressing portion presses the first magnet radially outward from a radially inner side of the first magnet. The second inner pressing portion presses the second magnet radially outward from a radially inner side of the second magnet. Accordingly, the first magnet and the second magnet are accurately positioned for the rotor core.

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

A rotary electric machine includes a stator including a coil, and a rotor in an inner peripheral side of the stator. The rotor core comprises a soft magnetic metal and a magnet within a magnet insertion hole, a first magnet stopper on a q axis side of the magnet in the magnet insertion hole, a magnet accommodation between the first magnet stopper on both sides of the magnet insertion hole, a first space portion communicating with the magnet insertion hole, a second space portion whose distance from the magnet is equal to or less than a thickness of the magnet and a radial length of a magnetic pole center is long, the second space portion formed on an inner peripheral side relative to the magnet, and a third space portion that has a convex shape on an inner peripheral side of a q axis of the magnet.

A rotary electric machine includes a stator including a coil, and a rotor in an inner peripheral side of the stator. The rotor core comprises a soft magnetic metal and a magnet within a magnet insertion hole, a first magnet stopper on a q axis side of the magnet in the magnet insertion hole, a magnet accommodation between the first magnet stopper on both sides of the magnet insertion hole, a first space portion communicating with the magnet insertion hole, a second space portion whose distance from the magnet is equal to or less than a thickness of the magnet and a radial length of a magnetic pole center is long, the second space portion formed on an inner peripheral side relative to the magnet, and a third space portion that has a convex shape on an inner peripheral side of a q axis of the magnet.

A rotor for an electric machine, wherein the electric machine includes a stator and the rotor, which is rotatable relative to the stator. The rotor includes a plurality of permanent magnets and a first rotor portion, which is formed from a first material having a first magnetic permeability. The first rotor portion includes at least one sub-portion of the rotor facing the stator in an operationally ready state of the electric machine. The permanent magnets are arranged at least in part in the first rotor portion. The rotor also includes a second rotor portion, which is formed from a second material having a second magnetic permeability which is lower than the first magnetic permeability. The second rotor portion includes a sub-portion of the rotor facing away from the stator in the operationally ready state of the electric machine.

A rotor for an electric machine, wherein the electric machine includes a stator and the rotor, which is rotatable relative to the stator. The rotor includes a plurality of permanent magnets and a first rotor portion, which is formed from a first material having a first magnetic permeability. The first rotor portion includes at least one sub-portion of the rotor facing the stator in an operationally ready state of the electric machine. The permanent magnets are arranged at least in part in the first rotor portion. The rotor also includes a second rotor portion, which is formed from a second material having a second magnetic permeability which is lower than the first magnetic permeability. The second rotor portion includes a sub-portion of the rotor facing away from the stator in the operationally ready state of the 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.

A rotor for an electric machine includes a sheet metal package formed from stacked electrical sheets and having magnet pockets arranged therein, a plurality of magnets of which at least one is inserted into each of the magnet pockets, a plurality of clearances which are each delimited by the magnets inserted into one of the magnet pockets and by the sheet metal package, a filling opening which is arranged on an axial side of the sheet metal package and through which a first of the clearances is exposed, and a venting opening which is arranged on the axial side and through which a second of the clearances is exposed. The outer end of the filling opening and/or the outer end of the venting opening are widened. Also described are an electric machine having the rotor, a vehicle having the machine and a method for producing the rotor.

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.