Freescale Semiconductor, Inc.
Introduction
The dead time causes distortion to the generated voltage, and thus a
non-sinusoidal phase current.
This distortion causes distortion of the motor performance. It is
especially apparent in low speeds, when the dead time is comparable
with the PWM pulse width. Also, the longer the dead time, the higher the
influence it has over the motor performance.
Dead time distortion can be corrected by properly modulating the power
stage control signals. The advantages of dead time distortion correction
are:
• Smoother running motors
• Less torque ripple
• Quieter motors
• More efficient operation (less harmonic losses).
Designer Reference Manual
14
DRM019 — Rev 0
Introduction
MOTOROLA
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