Electronically commutated DC machine and use thereof
First Claim
1. An electronically commutated DC machine comprising a rotor having at least one permanent magnet with at least four poles adjacent an annular return circuit member, said poles being disposed concentrically to the rotary axis of the rotor and being polarized substantially perpendicularly thereto, at least one stationary meander-like conductive strip array in an annular gap between the rotor and the return circuit member, said strip array including linear forward and backward extending meander sections and being produced by preform winding such that at least one of the linear forward and backward extending meander sections comprises a number of parallel conductor sections, at least some of which are connected in series per linear meander sections, means for detecting the angular position of the rotor relative to one of the linear forward and backward extending meander sections of the conductive strip array, and an electronic control system for controlling on the basis of signals produced by the detecting means the flow of current through the conductive strip array such that the conductive strip array produces a magnetic field to drive the rotor, said electronic control system being mounted on a generally annular circuit board about the rotary axis of the rotor within the meander-like conductive strip array.
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Accused Products
Abstract
The rotor of an electronically commutated DC machine, which may be operated in the motor mode or in the generator mode, comprises at least one permanent magnet having at least four poles disposed concentrically to the rotary axis of the rotor, said poles being polarized substantially normal to said axis of rotation and being disposed adjacent an annular return circuit member. The stator winding is arranged in the annular gap between rotor and return circuit members and comprises a meander-like conductive strip array whose linear forward or backward extending meander sections consist of a number of parallel conductor sections. Means for detecting the angular position of the rotor relative to the linear forward and backward extending meander sections supplies signals to an electronic control system which in turn controls the flow of current through the conductive strip array such that the latter produces a magnetic field to drive the rotor. An electronically commutated DC motor of such structure and including, for instance, 40 poles exhibits an extremely constant rated motor speed and by virture of the high space factor in the magnetic gap produces a high e.m.f. Such a motor may preferably be used as driving unit in Winchester disk storages.
78 Citations
27 Claims
- 1. An electronically commutated DC machine comprising a rotor having at least one permanent magnet with at least four poles adjacent an annular return circuit member, said poles being disposed concentrically to the rotary axis of the rotor and being polarized substantially perpendicularly thereto, at least one stationary meander-like conductive strip array in an annular gap between the rotor and the return circuit member, said strip array including linear forward and backward extending meander sections and being produced by preform winding such that at least one of the linear forward and backward extending meander sections comprises a number of parallel conductor sections, at least some of which are connected in series per linear meander sections, means for detecting the angular position of the rotor relative to one of the linear forward and backward extending meander sections of the conductive strip array, and an electronic control system for controlling on the basis of signals produced by the detecting means the flow of current through the conductive strip array such that the conductive strip array produces a magnetic field to drive the rotor, said electronic control system being mounted on a generally annular circuit board about the rotary axis of the rotor within the meander-like conductive strip array.
- 25. An electronically commutated DC machine comprising a rotor having at least one permanent magnet with at least four poles adjacent an annular return circuit member, said poles being disposed concentrically to the rotary axis of the rotor and being polarized substantially perpendicularly thereto, at least one stationary meander-like conductive strip array in an annular gap between the rotor and the return circuit member, the strip array including linear forward and backward extending meander sections and at least one of the linear forward and backward extending meander sections comprising a number of parallel conductor sections, means for detecting the angular position of the rotor relative to the linear forward and backward extending meander sections of the conductive strip array, and an electronic control system for controlling on the basis of signals produced by the detecting means the flow of current through the conductive strip array such that the conductive strip array produces a magnetic field to drive the rotor, said electronic control system being mounted on a generally annular circuit board about the rotary axis of the rotor within the meander-like conductive strip array.
Specification