Patent
Direct current motor with stationary armature and field
TLDR
In this paper, the authors describe a direct current (DC) motor with a rotor formed of a material having high magnetic permeability and having a plurality of salient poles, which is rotatably mounted adjacent to the field winding so that magnetic flux induced in the poles interacts with the current passing through the armature windings.Abstract:
This disclosure describes a direct current (DC) motor structure having stationary (immovable) field and armature windings A rotor formed of a material having high magnetic permeability and having a plurality of salient poles is rotatably mounted adjacent to the field winding so that the field winding electromagnetically induces magnetic flux in the poles The armature windings are also mounted adjacent to the rotor In operation, the magnetic flux induced in the poles interacts with the current passing through the armature windings The current flow in the armature windings is controlled by a solid-state commutator in a manner normally associated with brushless DC motors By controlling the magnitude of the current supplied to the field windings, the speed of the motor is controlled In addition, the windings can be connected in a series, shunt or compound configuration as desiredread more
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Robert D. Drescher,David B. Eisenhaure,Richard L. Hockney,Bruce G. Johnson,Emery St. George,David C. Whipple +5 more
TL;DR: An inertial energy storage device including a synchronous rotary electrical machine for bidirectional conversion between mechanical and electrical energy is described in this article, where a motor control circuit including sensor means for sensing the position of the rotor relative to the stator is used to generate a waveform for driving the machine when it is operating as a motor.
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Stepper motor system
TL;DR: In this article, an electrical stepper motor system is presented in which a microcomputer controlled driver monitors the real-time operating parameters of the stepper motors, and the driver is controlled by the microcomputer on a moment-by-moment basis in response to changes in certain conditions occurring within the steppers, as well as in the outside operating environment.
References
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Patent
Stepping motor positioning system including acceleration and deceleration control
TL;DR: In this article, a stepping motor control system produces pulses having parameters dependent on the rotational speed of the motor rotor and energizes the motor windings in response to these pulses.