A rotor for an induction motor 300 including end rings having an annular shape, which is provided at an end of a rotor core and is connected to a conductor bar projecting from the end of the rotor core, and first reinforcing members having an annular shape, each of which is provided between the rotor core and the corresponding one of the end rings and is in contact with the corresponding one of the end rings. The first reinforcing members each have an insertion hole formed therein to which the conductor bar projecting from the end of the rotor core is to be inserted.

A rotor for an LSIPM comprises a plurality of permanent magnets defining a number of poles (P) of the LSIPM, and a plurality of rotor bars spaced about the rotor defining a rotor bar area (BA). The rotor bars are formed of a conductive material having an associated conductivity (?.sub.RB). End members are disposed on axial opposite ends of the rotor core. The end members are in electrical contact with the rotor bars. The end members are formed from a material having an associated conductivity (?.sub.EM). Each end ring member has a minimum geometric cross sectional area (ERA) and outer diameter that generally corresponds to the rotor core outer diameter. The ERA is greater than 0.5 times the rotor bar area per the number of poles (BA/P) times a ratio of the rotor bar material conductivity to the end member material conductivity (?.sub.RB/?.sub.EM).

A method of in situ formation of an aluminum carbon nanotube composite material and an induction motor component produced with such composite. The method includes forming an aluminum-based matrix by mixing a catalyst precursor with an aluminum powder such that a colloidal compound is formed that is subsequently sintered to leave a catalytically-active material formed on the surface of the aluminum powder. A carbon-containing gas is introduced to the composite catalyst that includes aluminum and the catalytic metal so that carbon nanotube reinforcements are grown on the aluminum-based matrix with the assistance of the catalytically-active metal. Additional mechanical processing steps may also include pressurizing, sintering and cold-rolling the aluminum carbon nanotube composite material.

The present application relates to the field of electric motor, particularly to a motor rotor structure with copper conductive bars. This application aims at solving the problem existed in the art, which is how to reduce stress concentration of the rotor iron core and how to avoid deformation of the copper end rings. The motor rotor structure of this application comprises a rotor iron core provided with rotor slots, copper conductive bars provided within the rotor slots, rotor end rings respectively provided at two ends of the rotor iron core. Each rotor end ring includes copper end rings and steel end rings. The copper end rings are alternately laminated with the steel end rings and welded together into a piece. Thanks to very high stiffness and resistance to large deforming force, the steel end rings provided between and compressed by the copper end rings ensure that the rotor end rings of the present application will not deform even at high rotating speed, thereby reducing stress concentration without compromising structural stiffness.

The vehicle drive system includes: a motor having a cylindrical stator and a cylindrical rotor provided in the stator and driving a drive wheel of a vehicle by rotation of the rotor; and a motor ECU controlling the motor. The stator has plural primary conductors, and the rotor has plural secondary conductors in a radially outer portion. The motor is configured to change a number of poles of the stator when the motor ECU increases/reduces a number of primary conductor groups through which the current flows in the same direction and are continuously aligned in a circumferential direction. An ECU and the motor ECU are configured to change the number of the poles of the stator on the basis of at least one of a driving operation by a driver and a travel state of an own vehicle.

A rotor of an aircraft electric motor includes a shaft made of a first material, and a skin made of a second material different from the first material. The skin includes two half-shells welded together, each half-shell of the two half-shells including a chamfer, and the chamfers assembling the two half-shells together. The shaft includes a shoulder portion the skin being fixed on the shoulder portion. The rotor further includes an interpenetration layer of the first material and of the second material, the interpenetration layer including an alloy of the first material and an alloy of the second material, the interpenetration layer being between the shaft and the skin.

The invention relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing material strips (2) from a metallic material; b) vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strips (2), and vertically edge-rolling the material strips (2) such that open disk-shaped rings (31) are formed; c) stacking the rings (3, 31, 32) such that the cut-outs (5) of all disk-shaped rings (3, 31, 32) are disposed in mutual alignment; d) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

The invention furthermore relates to a method for producing a short-circuiting ring (1) for a squirrel-cage rotor of an asynchronous machine, wherein the method comprises the following steps in the sequence mentioned: a) providing a material strip (2) from a metallic material; b) vertically edge-rolling the material strip (2) so as to form a helix (4); separating the metal strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); and punching cut-outs (5) into the disk-shaped rings (3, 31, 32); or punching cut-outs (5) into the material strip (2); vertically edge-rolling the material strip (2) so as to form a helix (4); and separating the material strip (2) into a plurality of portions in such a manner that a stack of a plurality of open disk-shaped rings (31) is formed from the helix (4); c) bundling the individual rings (3, 31, 32) by connecting neighboring rings (3, 31, 32).

An induction rotor assembly having an induction cage that is formed using a combination of liquid and solid materials. The first and second end plates of the induction cage may be fabricated before the casting of the conductors of the induction cage. According to certain embodiments, the first and second end plates may be assembled with first and second molds and a rotor core to form a casting assembly. A liquid casting material may be injected into the casting assembly, wherein the liquid casting material may solidify within one or more core passageways of the rotor core, thereby forming the conductors of the induction cage. The first and second end plates may also include flow channels that may be configured to facilitate the flow of the liquid casting material in the casting assembly, and increase the area of contact between the liquid casting material, when solidified, and the end plates.

An electric machine rotor, which extends along an axis of rotation, including a short-circuit cage, the or each first connection means between a respective first end part of the or each bar and the first short-circuit ring includes a plurality of flexible electrically conductive blades.

A rotor of an aircraft electric motor includes a shaft made of a first material, and a conductive assembly made of a second material different from the first material. The shaft includes a shoulder portion, the shoulder portion includes longitudinal notches. The notches include two contiguous notches radially superimposed in the shoulder portion, a first opening on a radially outer face of the shoulder portion, and a second opening connecting the two contiguous notches. The conductive assembly is a one-piece structure including a conductive bar that is positioned in one notch of the notches, and a skin that is fixed on the shoulder portion.