Permanent magnet DC machine having meander-like stator windings for producing high torque without excessive heating

Abstract

An electronically-commutated DC machine having a permanent magnet rotor, generating a homogeneous magnetic field with linear and radially extending magnetic field lines. The rotor continuously changes polarity within an essentially cylindrical air gap. Meander-like stator means include linear forward and backward extending meander sections within the annular gap. Each linear meander section includes a number of conductor sections arranged geometrically parallel and having an essentially rectangular cross-sectional area. Each conductor section is located within the annular gap so that the longer side of the conductor cross-sectional area extends parallel to the direction of the magnetic field lines. A fan may be provided within the motor housing independently driven by a second stator rotor combination to produce a cooling air flow in the annular gap, cooling the conductor section of the stator means.

Dependencies are inferred from the claim text.