Brushless D.C. motor
OwnerSiegfried Mullerinventor
Life of this patent
Estimating the term…
Abstract
The invention relates to a collectorless D.C. motor with a horizontal air gap, particularly a low-speed motor for the direct drive of recording and/or reproducing devices. As per invention, the rotor axle is supported within an axial bore of the motor housing, with the motor housing made of plastic. The stator winding and the magnetic return structure are fixedly arranged on the motor housing which is also provided with bores for attaching the motor on installing it into the device. Obviating of machining sequences, simplification of assembly and direct support of the rotor axle in the motor housing all contribute to a reduction in manufacturing cost.
Claims10
In a commutatorless D.C. motor with a plane air gap and a rotor shaft, particularly for use as a direct drive of signal-processing recording and/or reproducing devices, an improvement comprising a plastic motor housing having a bore extending perpendicular to the plane of the air gap, said rotor shaft being received in said bore, said bore being shaped so as to form at least two bearing surfaces supporting the rotor shaft and to further form spaces between the rotor shaft and the housing, said spaces containing lubricant;
- and a thrust bearing located at a lower end of the bore and supporting a lower end of the rotor shaft.
Dependencies are inferred from the claim text.