Patent
Waveform synthesis using switching circuits
TLDR
In this paper, the synthesis of a waveform which upon integration will approximate a sinusoid of controllable frequency and amplitude is disclosed. But the synthesizer is suitable as a variable speed AC motor drive, and the output waveform is synthesised by chopping a square wave using a variable width chop.Abstract:
The synthesising of a waveform which upon integration will approximate a sinusoid of controllable frequency and amplitude is disclosed. Any desired amplitude may be programmed for a particular frequency. The synthesiser is suitable as a variable speed AC motor drive. The output waveform is synthesised by chopping a square wave using a variable width chop. To obtain lower harmonic content, a chopped square wave is Walsh multiplied with another square wave of different frequency to produce a pulse width modulated waveform having a frequency equal to the frequency difference between the square waves. Methods for accurately controlling the difference frequency using variable digital dividers are disclosed.read more
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Patent
Multi-channel motor winding configuration and pulse width modulated controller
TL;DR: In this article, a multichannel motor winding configuration providing low harmonic distortion and a PWM inverting controller for this type of winding configuration are disclosed, where a plurality of individually insulated conductors wound in a group through the stator slots of a synchronous or induction type AC motor.
Patent
Synthesizer for multiphase waveforms
TL;DR: In this paper, a synthesizer for multiphase waveforms is described, which is useful in open and closed loop control of a two-phase induction motor, such as for a magnetic recording disk spindle, utilizing a plurality of bistable elements, two for each phase.
Patent
System and method for energy storage and retrieval
TL;DR: In this paper, a system for storing and releasing energy, including a generator/motor and a hydraulic pump for pumping hydraulic fluid between first and second pump ports in response to force applied by the generator or motor, is presented.
Patent
Motor controller with drive-signal conditioning
Frederic Bonvin,Ezio Galbiati +1 more
TL;DR: In this paper, a motor controller includes a motor driver and a signal conditioner, and the motor driver is operable to generate a motor-coil drive signal having a first component at a first frequency.
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Three phase a.c. motor drive system
TL;DR: In this article, a three phase binary driver control signal is modulated below 60 cycles per second to operate the motor in a constant torque mode without varying the rectifier output voltage, which includes a delay to protect the drivers by assuring that one driver of a pair is "off" prior to turning the other driver "on".
References
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Patent
Pulse width modulated inverter adaptive logic
TL;DR: In this paper, an adaptive logic is provided to control conduction of the switch means in the inverter, which is responsive to pulse width, notch width and a maximum or minimum carrier frequency all controlling the change of the ratio of carrier frequency to fundamental frequency.
Patent
Displaced waveform for a pulse width modulated power source
A Humphrey,D Szymanski +1 more
TL;DR: In this paper, a pulse width modulated power source is disclosed capable of producing a displaced waveform which has a fixed RMS value and a variable ratio of fundamental to harmonic component.