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BrianG · 03.24.2011, 06:16 PM

Actually, if I read Patrick's explanation correctly, the FETs do short the motor phases (in PWM form). While the FET shorts the phase, the motor wants to stop, but since the braking is done in PWM pulses, the overall effect is more gradual. The only time voltage is "sent back" to the battery is when the FETs go from shorted to open. At this time, the motor is allowed to free run again, and this is when some of that stored energy is allowed to go back to the battery.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	03.24.2011, 06:16 PM Actually, if I read Patrick's explanation correctly, the FETs do short the motor phases (in PWM form). While the FET shorts the phase, the motor wants to stop, but since the braking is done in PWM pulses, the overall effect is more gradual. The only time voltage is "sent back" to the battery is when the FETs go from shorted to open. At this time, the motor is allowed to free run again, and this is when some of that stored energy is allowed to go back to the battery.