The MCF8329A offers
four ways of controlling the motor:
- SPEED Control: In speed
control mode, the speed of the motor is controlled using a closed loop PI
control according to the input reference.
- POWER Control: In power
control mode, the DC input power of the inverter power stage is controlled
using a closed loop PI control according to the input reference.
- CURRENT Control: In current
control mode, the torque controlling current (iq) is controlled using a
closed loop PI control according to the input reference. In this mode the
speed/power control loop is disabled.
- MODULATION INDEX Control
(VOLTAGE Control): In voltage control mode, the voltage applied to the motor
is controlled according to the input reference.
The device can accept four types of input
reference signal as configured by SPEED_MODE.
- PWM input on SPEED/WAKE pin by varying duty cycle of input signal
- Frequency input on SPEED/WAKE pin by varying frequency of input signal
- Analog input on SPEED/WAKE pin or
DACOUT/SOx/SPEED_ANA pin by varying amplitude of input signal
- Over I2C by configuring DIGITAL_SPEED_CTRL
The signal path from
REF (SPEED/WAKE or DACOUT/SOx/SPEED_ANA) pin input (or I2C based speed
input) to output reference (SPEED REF or POWER REF or CURRENT REF or MODULATION
INDEX REF) shown in Figure 7-7.