A refrigeration unit including a refrigeration circuit, a mounting plate, a power electronics device thermally coupled to the mounting plate, and a heat sink thermally coupled to the mounting plate and to a component of the refrigeration circuit. The heat sink is configured to transfer waste heat from the mounting plate to the component of the refrigeration circuit.

A stator assembly, an electrical motor having the stator assembly, a wind power generator set and a method for cooling a stator assembly are provided. The stator assembly includes a stator support and a stator core mounted on the stator support, wherein the stator support includes a support enclosure plate, a first axial air flow channel is formed between the support enclosure plate of the stator support and a radial side surface of the stator core, and the first axial air flow channel is used for receiving a first cold air flow, so that the cold air flow can flow in the axial direction. The stator assembly can introduce a cold air flow from the other side, opposite an air gap, of a stator during the operation of an electrical motor, so that two radial sides of the stator can be cooled at the same time.

A rotor for an electric machine includes a heat pipe cooling system. A rotor core has a number of cavities internal to the rotor core. The cavities are surrounded by a wall defined by the rotor core. A magnetic element disposed in the at least one cavity leaving a void in the at least one cavity between the magnetic element and the wall. A heat pipe evaporator is disposed in the void and conforms to the available space, contacting the magnetic element and the wall to remove heat from the rotor core.

An electric machine includes a housing having an air intake, an air outlet, and defining an air passage therein. The air passage includes a first channel extending from the air intake in a radial direction and a second channel extending in the radial direction to the outlet. The electric machine further includes a motor assembly positioned within the housing that includes a shaft that rotates about a rotational axis that is generally perpendicular to the radial direction. The electric machine further includes an electronics assembly within the housing interior and a heat sink positioned at least partially within the air passage and thermally connected to the electronics assembly. Operation of the motor assembly draws an ambient airflow into the air passage in the radial direction through the air intake, directs the airflow along the heat sink, and exhausts the airflow through the air outlet in the radial direction.

A power tool is provided including a gear case having a spindle, a motor case connected to a rear end of the gear case along a longitudinal axis; a handle portion extending from a rear end of the motor case along the longitudinal axis; a motor housed inside the motor case; a fan in rotational connection with the motor; at least one air intake arranged at least one of the motor case or the handle portion near the rear end of the motor case; and a power module including power switches for driving the motor and a heat sink. The power module is housed in at least one of the motor case or the handle portion near the rear end of the motor case such that rotation of the fan causes air flow to enter through the air intake and flow near the heat sink and through the motor.

Disclosed are a rotor plate and a rotor assembly including the same. The rotor plate includes a plate body including a first part having a first hole at a center, and a second part having a second hole at a center, the second part having a diameter corresponding to the first part, and connected to the first part in a first direction that is an axial direction perpendicular to the first part, and a diameter of the second hole is larger than a diameter of the first hole, a first slot recessed on an outer peripheral surface of the plate body, a second slot recessed on the outer peripheral surface of the plate body, and a first plate passage formed on a wall of the first part in the second direction that is opposite to the first direction, and connecting the first slot and the first hole.

Disclosed are a rotor plate and a rotor assembly including the same. The rotor plate includes a plate body including a first part having a first hole at a center, and a second part having a second hole at a center, the second part having a diameter corresponding to the first part, and connected to the first part in a first direction that is an axial direction perpendicular to the first part, and a diameter of the second hole is larger than a diameter of the first hole, a first slot recessed on an outer peripheral surface of the plate body, a second slot recessed on the outer peripheral surface of the plate body, and a first plate passage formed on a wall of the first part in the second direction that is opposite to the first direction, and connecting the first slot and the first hole.

An electric machine includes a stator comprising a plurality of stator teeth, a winding disposed on each stator tooth of the plurality of stator teeth, a heat sink mounted in thermal contact with an end winding of each winding and comprising a plurality of microchannels, a heat-transfer fluid disposed within the plurality of microchannels, and a condenser configured to exchange heat with the heat sink.

An electric machine includes a stator comprising a plurality of stator teeth, a winding disposed on each stator tooth of the plurality of stator teeth, a heat sink mounted in thermal contact with an end winding of each winding and comprising a plurality of microchannels, a heat-transfer fluid disposed within the plurality of microchannels, and a condenser configured to exchange heat with the heat sink.

A motor device includes a motor, a first substrate, a second substrate, a first heat sink, and a second heat sink. The second substrate is placed to face the first substrate in the plate-thickness direction of the second substrate. A second element group provided on the second substrate has a heat generation amount larger than that of a first element group provided on the first substrate. The first heat sink is placed between the first substrate and the second substrate so as to promote heat dissipation from the first element group and the second element group. The second heat sink is placed on the opposite side of the second substrate from the first heat sink and is configured to promote heat dissipation from the second element group.