Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1987-10-07
1989-06-20
Ro, Bentsu
Electricity: motive power systems
Switched reluctance motor commutation control
318138, 310 905, F16C 3906, H02K 709
Patent
active
048412040
ABSTRACT:
A brushless DC motor is disclosed wherein armature forces can be produced and controlled as both radial forces and as torque couples. A structure is described in which the normal radial destabilizing forces due to the high levels of magnetic flux linking the stator and rotor are reduced and the force gradient is moderated. This is accomplished by locating the rotor between two concentric stator coil assemblies either of which may be used for bearing or torquing to join the rotor magnets via magnetically "soft" iron, thereby reducing the rotor mass and inertia with the consequent improvement in dynamic performance. Since the forces on the rotor are the sum of the forces produced by each individual stator coil, it is possible to combine groups of stator coils in various ways and independently control them to achieve the dual purpose. Radial position sensors and commutation sensors are included, the former to control currents in diagonally opposite pairs of stator coils in response to eccentricity as measured by the position sensors and the latter to make the resultant radial force independent of the rotor magnets angular position and polarity. The same commutation sensors also provide rotor angular information for smooth torque production in the normal manner.
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Gates William L.
Ro Bentsu
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