Electronically commutated DC machine

Electrical generator or motor structure – Dynamoelectric – Rotary

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310208, H02K 304

Patent

active

057239339

ABSTRACT:
An electronically commutated DC machine, especially a DC motor, comprises a permanent magnet rotor providing a cylindrical air gap having a homogeneous magnetic field with straight, radially extending field lines and continuously alternating polarity. An iron-free stator means is formed like a self-supporting stator coil made of conductor material and cured synthetic resin comprises straight coil portions extending within the air gap. In order to provide machine, especially a motor, adapted for air cooling and providing a high current density, high-dynamic features and good overload capacity and further providing a behaviour essentially linear to the supplied current, the conductor material of each coil portion is consisting of one or several strand(s), wherein each strand comprises a number of thin filaments, being individually insulated, being arranged twisted within the strand and having a diameter equal or less than 0.4 mm. Said conductor material and liquid resin have been compacted in order to provide a stator coil comprising a content of conductor material of from 70 to 90% by volume.

REFERENCES:
patent: 4080543 (1978-03-01), Takahashi et al.
patent: 4260924 (1981-04-01), Lugosi et al.
patent: 4278905 (1981-07-01), Chari et al.
patent: 4763053 (1988-08-01), Rabe
patent: 5331244 (1994-07-01), Rabe

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