AN1910 Freescale Semiconductor / Motorola, AN1910 Datasheet - Page 7

• Manufacturer Part Number: AN1910
• Description: 3-Phase AC Motor Control with V/Hz Speed Closed Loop Using the DSP56F80X
• Manufacturer: Freescale Semiconductor / Motorola

4.
In a case of AC V/Hz closed loop application, the feedback speed signal is derived from incremental
encoder using the quadrature decoder. The speed controller constants have been tuned experimentally
according to the actual load.
The system is designed to drive a 3-phase AC induction motor. The application meets the following
performance specifications:
The introduced AC drive is designed as a DSP system that meets the following general performance
requirements:
The DSP runs the main control algorithm. According to the user interface input and feedback signals,
it generates 3-phase PWM output signals for the motor inverter.
A standard system concept is chosen for the drive, and illustrated in
incorporates the following hardware boards:
Motor Characteristics:
Drive Characteristics:
Load Characteristic:
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System Design Concept
Targeted for DSP56F80XEVM platforms
Running on 3-phase ACIM motor control development platform at variable line voltage 115 -
230V AC
Control technique incorporates
— motoring and generating mode
— bi-directional rotation
— V/Hz speed close loop
Manual Interface (Start/Stop switch, Up/Down push button speed control, LED indication)
PC Master Interface (motor start/stop, speed set-up)
Power stage identification
Overvoltage, undervoltage, overcurrent, and overheating fault protection
3-Phase AC Motor Control with V/Hz Speech Closed Loop
Freescale Semiconductor, Inc.
Table 4-1. Motor / Drive Specification
For More Information On This Product,
Base Electrical Frequency:
Max. Electrical Power:
Max. DC Bus Voltage
Go to: www.freescale.com
Delta Voltage (rms):
Control Algorithm
Speed Range:
Speed Range
Transducers:
Optoisolation
Motor Type
Line Input:
Type
4 poles, three phase, star connected,
squirrel cage AC motor (standard
IRC -1024 pulses per rev.
<2250 rpm @ 230 V
<1200 rpm @ 115 V
Close Loop Control
industrial motor)
230V / 50Hz AC
115V / 60Hz AC
< 5000 rpm
200V (Star)
Figure
Required
System Design Concept
Varying
180 W
50 Hz
400 V
4-1. The system
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