Method and apparatus for operating an electric motor
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United States of America Patent
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Nov 20, 2018
Grant Date -
Dec 14, 2017
app pub date -
Jun 14, 2016
filing date -
Jun 14, 2016
priority date (Note) -
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Abstract
Apparatus and methods of operating an electric motor are provided, comprising energizing a plurality of stator coils in sequence to rotate a rotor. Each said coil is energized with a repeating pulse sequence comprising at least a first portion and a second portion, the first and second portions repeating alternately to form the repeating pulse sequence. The first portion comprises a first pattern of pulses, each pulse in the first pattern having either a first polarity or second polarity, and at least two consecutive pulses in the first pattern having the same polarity. The second portion comprises a second pattern of pulses, the second pattern of pulses having the same pattern as said first pattern of pulses, but having inverted polarity with respect to said first pattern of pulses.
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