Motorola M68HC08 Reference Manual page 40

Sensorless bldc motor control using the mc68hc908mr32
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BLDC Motor Control
3.3.1.2 Running
Designer Reference Manual
40
Freescale Semiconductor, Inc.
The current controller subroutine, with PI regulator, is called to control
dc-bus current. It sets the correct PWM ratio for the required current. The
current PI controller works with constant execution (sampling) period.
This period should be a multiple of the PWM period, in order to
synchronize the current measurement with PWM:
Current controller period = n/PWM frequency
The BLDC motor rotor position with flux vectors during alignment is
shown in
Figure
3-15.
The commutation process is a series of states which assure:
The back-EMF zero crossing is successfully captured
The new commutation time is calculated
The commutation is performed
The following processes need to be provided:
BLDC Motor Control
For More Information On This Product,
Go to: www.freescale.com
Figure 3-15. Alignment
DRM028 — Rev 0
MOTOROLA

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