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extract from service manual
<onlyinclude>
The controller is a switching [[wikipedia:MOSFET|MOSFET]] power supply that creates 3 phased sine wave outputs to drive the motor via [[wikipedia:Pulse-width modulation|Pulse-width modulation]] (PWM).
: The switching attempts to produce a smooth sine wave to each output terminal via [[wikipedia:Space vector modulation|Space vector modulation]] strategy of PWM.
: The motor has 3 stator (casing-embedded) windings at 120° equally spaced offsets around the circumference.
:* Each winding pulls from one motor terminal's output from the controller.
:* Each winding electromagnetically pulls on the rotor.
:* The forces need to balance out, not leading to a net lateral force on the rotor and shaft.
:* It also shouldn’t precess or wobble or slip.
: The process of making the sine waves is “encoding”.
[[File:my2017sr-sevcon-scope.jpg|thumb|MY2017 Zero SR. Scope at Sevcon M3 Output Terminal]]
</onlyinclude>
[[Category:Theory]]
The controller is a switching [[wikipedia:MOSFET|MOSFET]] power supply that creates 3 phased sine wave outputs to drive the motor via [[wikipedia:Pulse-width modulation|Pulse-width modulation]] (PWM).
: The switching attempts to produce a smooth sine wave to each output terminal via [[wikipedia:Space vector modulation|Space vector modulation]] strategy of PWM.
: The motor has 3 stator (casing-embedded) windings at 120° equally spaced offsets around the circumference.
:* Each winding pulls from one motor terminal's output from the controller.
:* Each winding electromagnetically pulls on the rotor.
:* The forces need to balance out, not leading to a net lateral force on the rotor and shaft.
:* It also shouldn’t precess or wobble or slip.
: The process of making the sine waves is “encoding”.
[[File:my2017sr-sevcon-scope.jpg|thumb|MY2017 Zero SR. Scope at Sevcon M3 Output Terminal]]
</onlyinclude>
[[Category:Theory]]
