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Introduction
1.2.
The BAS reads in a +/-10 volt signal and commutates a brushless motor with a sine wave
current command. Sine wave commutation is done via an encoder (quadrature input) and
provides the smoothest possible motion for a brushless motor. The input signal can be
either a velocity command or a torque (current) command. If the input signal is a current
command, a two-phase current command is sent directly to the amplifier. If the input
signal is a velocity command, the BAS closes the velocity loop digitally (using the
encoder, two controller gains and the velocity command). The output from the internal
control board is a two-phase current command to the amplifier.
The operating parameters are changed through the RS-232 interface. This interface is
menu driven and interfaces with either a hand held terminal or DOS emulation software.
All parameters are stored in flash memory. After the initial setup, the unit will boot in the
user-defined configuration. Figure 1-2 shows a typical configuration using the BAS.
1-2
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Velocity/Torque Amplifier
Figure 1-2.
Aerotech, Inc.
BA SineDrive User's Manual
Illustration of Configuration
Version 1.4
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