Breathing electric motor

Abstract

The invention relates to an electric motor (5) that has efficient self-cooling. The electric motor (5) comprises a rotor (8) that is rotatably mounted with respect to a stator (6). On a first sub-segment (23a) of an end face (19) of the rotor (8), a first air-guiding contour (20a) is formed that, during rotation of the rotor (8) in a reference rotation direction (R), generates an outwardly directed air flow (S). On a second sub-segment (23b) of the same end face (19), a second air-guide contour (20b) is formed that, during rotation of the rotor (8) in a reference rotation direction (R), generates an inwardly directed air flow (S).

Description

technical field [0001] The invention relates to a motor, especially a self-cooling brushless motor. Background technique [0002] Electric motors generally comprise a rotor (or mover) that is rotatably mounted relative to a stationary stator (or stator). In brushless motors, the stator is usually equipped with a rotating field winding through which a rotating field is generated by applying an alternating current to the rotating winding. The rotor, which is often arranged inside the stator, is generally equipped with permanent magnets, which generate an excitation field that interacts with the rotating magnetic field of the stator. [0003] In brushless motors, the alternating current provided for supplying the stator windings is usually generated by means of inverter electronics (also referred to below as inverter). In smaller electric motors, the inverter is often accommodated together with the associated control electronics in an electronics compartment which is integrat...

AI Technical Summary

Problems solved by technology

[0005] On the downside, the cooling performance of such self-cooling electric motors is heavily dependent on the direction of rotation of the rotor

This leads to different motor types being often developed and manufactured for applications with different main directions of rotation, which leads to relatively high development, production and storage costs

[0006] Furthermore, conventional electric motors with self-cooling often have a relatively poor and uneven cooling performance, which can lead to localized overheating of the motor and a correspondingly low load-carrying capacity of the motor

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