Altera Multiaxis Motor Control Board User Manual

Multiaxis motor control board, Features

February 2014

Altera Corporation

MNL-1073

Reference Manual

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Multiaxis Motor Control Board

This reference manual describes the Altera

Multiaxis Motor Control Board.

Efficient control of torque and speed of AC motors requires corresponding control of
voltage and frequency that you supply to the motor. Typically, you filter the AC input
voltage for electromagnetic interference (EMI), correct it to achieve unity power
factor, then rectify it to yield a DC voltage. You then invert the rectifier output again
through switching of power electronics, such as insulated-gate bipolar transistors
(IGBTs) to create the appropriate variable AC voltages and frequency for the motor.
Control algorithms such as Field Oriented Control (FOC) of PMSMs require you to
measure and analog to digitally A/D convert motor current and voltages, to provide
the required feedback to the controller. In addition, you use analog-to-digital
converters (ADCs ) to monitor the DC link voltage and current. Multiaxis drives
achieve either a high degree of coordination of control across motors or, in some
applications, integrate control of multiple independent motors to reduce overall
system cost. In closed-loop control systems, modern drive requirements continue to
evolve the need for higher precision position and velocity encoder feedback devices.
Standard encoder interfaces, 7such as EnDat, BiSS, and HiperFace, are based on
traditional sin and cosine encoder techniques. These encoder interfaces incorporate
communication controllers that can transmit information back to the drive digitally,
which enhances their performance in noisy environments. Encoder interfaces support
features, such as online inspection of motor parameters and line delay measurement,
which you can incorporate into the motor control algorithm.

The Multiaxis Motor Control Board contains all the power electronics, current and
voltage sensing, and connections for motor position feedback. You can use the motor
Control Board to develop a motor control system that supports permanent magnet
synchronous motors (PMSMs) or brushless DC (BLDC) motors. The Multiaxis Motor
Control Board is suitable for single-axis and multiaxis motor control applications and
supports multiple position feedback interfaces..

Features

The Multiaxis Motor Control Board has the following features:

■

Power factor correction (PFC) and EMI filter

■

DC link power supply of 400 V

■

Switch mode power supplies for logic

■

IGBT power stages

■

Sigma-delta ADCs for sensing voltages and currents

■

Brake (chopper) switch

Table of contents

Document Outline

Multiaxis Motor Control Board