AN1857 Freescale Semiconductor / Motorola, AN1857 Datasheet - Page 29

• Manufacturer Part Number: AN1857
• Description: A 3-Phase ac Induction Motor Control System Based on the MC68HC908MR32
• Manufacturer: Freescale Semiconductor / Motorola

Software
AN1857
MOTOROLA
OPTIONAL PC TERMINAL
PC WORKSTATION*
Figure 19. 3-Phase Motor Control System Block Diagram
The software written for the system controls a 3-phase ac induction
motor. The system software includes power factor correction software
and PC-Master communication capability. Using a potentiometer
located on the control board as the motor’s speed setting, a tachometer
feedback scheme is used to close the speed control loop, using a PI loop
control algorithm.
Basic features of the control software are:
68HC908MR32
CONTROLLER
MMDS08 EMULATION SYSTEM
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Freescale Semiconductor, Inc.
BOARD
WITH MR32EM BOARD
For More Information On This Product,
Controlled acceleration and deceleration
Speed in the range of 0 to 3000 rpm
Drive can run clockwise or counterclockwise.
Speed sensed by a tachometer/generator
PWM frequency of 16 kHz
dc bus voltage protected by use of a dc bus brake
Go to: www.freescale.com
RIBBON
40-PIN
OPTOISOLATION
POWER SUPPLY
LOW-VOLTAGE
BOARD
*
RIBBON
40-PIN
The system can be run without
the workstation and emulator by
using a programmed MR32 and
a daughter board, plugged into
the MR32 controller board.
POWER SUPPLY
HIGH-VOLTAGE
POWER BOARD
HIGH-VOLTAGE
INDUCTION MOTOR
3-PHASE AC
Application Note
TACHOMETER
Software
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