AN1931D Freescale Semiconductor / Motorola, AN1931D Datasheet - Page 16

• Manufacturer Part Number: AN1931D
• Description: 3-Phase PM Synchronous Motor Vector Control
• Manufacturer: Freescale Semiconductor / Motorola

System Concept
4.
4.1 System Specification
16
A more-progressive method uses a Field-Weakening Controller, which generates a negative current
flux-producing component i
u_S_max_FWLimit. The field-weakening limit u_S_max_FWLimit is set to be close to the maximum
voltage limit of the 3-phase power inverter u_sdq_max with some reserve for regulation. Since the
DCBus voltage determines the u_sdq_max limit, the u_S_max_FWLimit is set according to the
DCBus. The u_S_max_FWLimit can be a constant or it can be calculated from a measured DCBus
voltage. The Field-Weakening controller is described in
The motor control system is designed to drive a 3-phase PM synchronous motor in a speed
closed-loop. The application meets the following performance specifications:
The PM synchronous drive introduced here is designed to power a high-voltage PM synchronous
motor with a quadrature encoder. It has the following specifications:
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System Concept
Motor Characteristics:
Vector control of PM motor using the quadrature encoder as a position sensor
Targeted for DSP56F80xEVM
Running on a 3-phase PM synchronous motor control development platform at variable line
voltage 110 - 230V AC
Control technique incorporates:
— Vector Control with speed closed-loop and field-weakening
— Rotation in both directions
— Motoring and generator mode with brake
— Start from any motor position with rotor alignment
— Minimum speed of 50rpm
— Maximum speed of 3000rpm at input power line 230V AC
— Maximal speed of 1500rpm at input power line 115V AC
Manual interface (Start/Stop switch, Up/Down push button control, LED indicator)
PC master software control interface (motor start/stop, speed set-up)
PC master software remote monitor
Power stage board identification
Overvoltage, undervoltage, overcurrent and overheating fault protection
Table 1: High Voltage Hardware Set Specifications
Freescale Semiconductor, Inc.
3-Phase PM Synchronous Motor Vector Control
For More Information On This Product,
sq
, whenever the absolute value of stator voltage exceeds
Go to: www.freescale.com
Maximum Electrical Power:
Phase Voltage
Phase Current
Speed Range
Motor Type
Section
6.2.5.4.
6 poles, 3-phase, star connected,
2500rpm (at 310V DCBus)
BLDC motor
3*220V
150 W
0.55A
MOTOROLA