Patent
Digital drive circuit for electric motor or the like
TLDR
In this paper, a digital drive current for application to a variable-speed electric motor is generated from a binary signal including N high-order bits and n low-order bit, and a pulse waveform of fixed frequency higher than the frequency to which the motor can respond is generated to have a pulse width duty cycle in accordance with the value of the high order bits.Abstract:
A digital drive current for application to a variable-speed electric motor is generated from a binary signal including N high-order bits and n low-order bits. A pulse waveform of fixed frequency higher than the frequency to which the motor can respond is generated to have a pulse width duty cycle in accordance with the value of the high-order bits. The low-order bits are used to make a one-step increase in the width of a proportion, determined by the value of the low-order bits, of the pulses of the pulse waveform, so that the average pulse width is increased a desired fraction of one step.read more
Citations
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Patent
Brushless dc ring motor cooling system
Chris Nelson,Bradford Palmer +1 more
TL;DR: In this article, a brushless DC ring motor is mounted on the stator assembly of a vehicle to sweep an area inside the shroud of a cooling fan, which is controlled by an electronic controller to rotate the cooling fan.
Patent
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TL;DR: In this paper, a phase error signal is derived by comparing the phase of a reference signal generated from a crystal oscillator with the digital tachometer signal obtained from the motor, thus allowing the long term speed variation of the motor to be controlled with an accuracy approaching that of the crystal utilized to derive the reference signal.
Patent
Electronic, variable speed engine governor
James Edward Rau,Rogell Vanwyk +1 more
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High accuracy voltage controlled oscillator (VCO) center frequency calibration circuit
TL;DR: In this paper, methods and systems for calibrating a frequency of a circuit are disclosed, which may comprise dividing a feedback frequency of an output frequency signal to generate a divided frequency signal.
Patent
Control system for brushless DC ring motor cooling fan
Chris Nelson,Bradford Palmer +1 more
TL;DR: In this article, a cooling system for a vehicle includes a cooling fan assembly with a brushless DC ring motor, a control/communication system operatively connected to an engine control module (ECM) of the vehicle, a DC-to-DC converter and a commutation switching segment.
References
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Patent
Clock pulse generator with selective pulse delay and pulse width control
TL;DR: In this paper, the registers are located in coarse and fine pulse delay and pulse width adjustment units, which have the same physical structure, but are functionally definable by a settable control element.
Patent
Digital dc motor velocity control system
TL;DR: In this article, a velocity control system for a motor is provided wherein first counter means are reset by feedback pulses from the motor to record the feedback period and the status of this is put into storage means.
Patent
Digital frequency generator
TL;DR: In this article, a digital frequency generator for producing a pulse output at a specified frequency is described, and the circuit is designed to operate in either of two modes in order to obtain high accuracy over a wide range of frequency operation.
Patent
Programmable pulse width generator
TL;DR: In this paper, a system for generating a digital signal comprising a sequence of pulses is disclosed with the first pulse of the sequence having a predetermined width which is sequentially increased by increments until the final pulse width is reached.