Method and apparatus for pulse width modulation control of an AC induction motor

Patent · Tue Jul 03 00:00:00 EDT 1984

OSTI ID:7204447

Geppert, S; Slicker, J M

This patent describes a method of generating m pulse width modulated waveforms, each having an average voltage which varies sinusoidally at a first frequency and being applied to a respective phase input of an m-phase AC induction machine. It comprises generating a carrier waveform; selecting a reference point on the carrier waveform and evaluating the function sin {theta} at the center of each pulse of the carrier waveform; modulating the width of each the pulse by moving the leading and trailing edges thereof through equal angular displacements in opposite directions, applying to one the input of the AC induction machines the modulated carrier waveform and applying to the remaining the inputs of the AC induction machine respective waveforms which are identical to the modulated carrier waveform but are shifted in phase with respect thereto by respective angular displacements at the first frequency which are successive integer multiples of 360{degrees} m.

• Assignee: Eaton Corp., Cleveland, OH (United States)
• Patent Number(s): A; US 4458194
• Application Number: PPN: US 7-318087
• OSTI ID: 7204447
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100* -- Power Systems-- (1990-)
42 ENGINEERING
426000 -- Engineering-- Components
Electron Devices & Circuits-- (1990-)
AC SYSTEMS
CONTROL
CONTROL EQUIPMENT
DESIGN
ELECTRIC GENERATORS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY CONTROL
FREQUENCY MODULATION
FUNCTION GENERATORS
INDUCTION GENERATORS
MODULATION
POWER SYSTEMS
PULSE GENERATORS
WAVE FORMS