A method for determining a state of an electric motor having a stator (2) and a rotor (3) rotatably mounted relative to the stator (2) is disclosed. Due to a rotary motion of the rotor (3), a pressure difference (p) relative to an environment (15) of the electric motor (1, 1, 1, 1) is caused in an air space (16) inside the electric motor (1, 1, 1, 1). Here, in a normal state of the electric motor (1, 1, 1, 1), the pressure difference depends on an actual rotational speed (n) of the rotor (3). A corresponding electric motor suitable for carrying out this method is disclosed, wherein the electric motor may be part of a fan.

A brush system for an electric motor, having a substantially semiannular resistor housing into which an electric flat resistor is introduced, two resistor terminals which protrude from the resistor housing and can be coupled in an electrically conducting manner to a conductor path of the electric motor, and a substantially semi-circular support plate that includes two bus bars to electroconductively couple the conductor path to the terminals and to two brush elements. The two terminals are arranged on the same narrow side of the resistor housing.

A casing for an electric machine includes an oil tank disposed on a lower part of the casing opposite an upper part of the casing. An oil pump is disposed between the oil tank and the lower part. The oil tank includes a funnel section oriented such that the smallest section is linked to a suction inlet of the oil pump and the largest section collects the oil running down in the casing.

A coolant supply system for an electric vehicle axle drive having an electric machine, in the electric machine housing of which a stator interacts with a rotor. The electric machine outputs to at least one vehicle wheel of the vehicle axle via a transmission arrangement. A coolant separator is arranged in the electric machine housing, which divides the interior of the electric machine housing into a radially outer stator chamber, in which the stator with its stator windings is arranged, and into a radially inner rotor chamber, which is separated therefrom in a largely fluid-tight manner and in which the rotor is arranged.

A spray oil cooling device for a stator core periphery of an electric drive unit in a motor vehicle comprising an oil pump for providing a cooling oil mass flow and an oil line for guiding the cooling oil mass flow starting from the oil pump to at least one first oil spray area at stator winding heads of a first stator end face, and at least one second oil spray area at stator winding heads of a second stator end face, wherein the oil line is designed to guide the cooling oil mass flow between the first and the second oil spray area, remote from a stator core cooling sleeve.

In order to prevent poor operability caused by entanglement of the fins in the heat sink during assembly without a drop in the cooling efficiency of the cooling flow along a rotation shaft, a plurality of fins 23c of the heat sink in a vehicle AC generator 1 is constituted by fin groups 123 in which fins are aligned in parallel in one direction, and an entanglement preventing portion 23d is disposed only on the respective outer side surfaces of a pair of outermost fins.

A coolant supply system for a drive device of an electrically operated vehicle axle of a two-track vehicle with an electric machine. The coolant supply system has an electric machine hydraulic circuit in which a coolant tank, the interior of a cylindrical stator housing and a stator housing sump are integrated, in which the coolant draining from the stator housing collects, which can be returned from there to the coolant tank by at least one return pump. The stator housing sump has a suction point on each of its axially opposite axial sides, from which the coolant can be sucked off by the return pump.

An electronic assembly (10) for an electrical rotating machine. The electronic assembly comprises a plastic overmoulded casing component (100) comprising housings (100 for receiving power modules (200), a power-conducting part overmoulded in the casing component and comprising a plurality of ground and phase traces (103a, 103b. 102), assembly openings (104, 104a, 104) for receiving means (114) for mounting each power module on the casing component, the power modules comprising a conductive support whereon power switches (2020) and signal components (2030) are mounted, the conductive support (2010) comprising a power connector (2011) connected to the power-conducting part of the casing component and at least two phase connectors (2012a, 2012b) connected to the phase traces (103a, 10b) of the casing component, and a lower ground plane (300) suitable for receiving the casing component and for being mounted on a dissipation unit of the electrical rotating machine.

An electric power steering apparatus (1) is provided with a heat sink (5) and an intermediate member (4) whose surface portions are perpendicularly placed with respect to an axial direction of a motor's shaft center, and arranged in such a way that each of power modules (51a, 51b) of a plurality of driving circuits is attached on a surface portion of the heat sink (5) so that an extending direction of a maximum outer dimension of the power modules (51a, 51b) is perpendicular to the axial direction, and each of electric devices (C1a-C1b) of the plurality of driving circuits is attached on a surface portion of the intermediate member (4) so that an extending direction of a maximum outer dimension of the electric devices (C1a-C1b) is perpendicular to the axial direction.

The present invention relates to a cooling structure for a hairpin winding motor, and more particularly, to a hairpin coil cooling structure for a hairpin winding motor, which is capable of improving performance in cooling a hairpin coil by spraying oil to a rotor plate, which is a component of a motor, and dispersing the cooling oil by rotating the rotor plate.