
SMA8130, SMA8230, and SMA8330
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Glentek Inc., 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322-3026
Chapter One: Description, Features and Specifications
1.1 Description:
This brushless amplifier system has been designed to offer you, our customer, a large
degree of flexibility and customization with a standard, in stock product. Each amplifier
consists of a standard power output board with one of our three types of personality modules
mounted on it. (To help you understand the various brushless amplifier and motor system
combinations and their respective advantages and disadvantages, please refer to chapter
two of this manual which describes the theory of operation). Following is a brief description
of these three personality modules and their mode(s) of operation:
• Trapezoidal Mode (SMA8130) - In this mode of operation, which is also commonly
referred to as six step, the brushless motor is commutated by hall sensors or an encoder
which contains these commutation signals. This personality module can be configured for
the following three different types of operation:
• VELOCITY MODE - In this mode of operation, a velocity signal from a brushless or
brush type tachometer is used to close a velocity loop in the amplifier. Please see
section 2.3, 2.7, 2.8 of this manual for more detailed information.
• SIMULATED VELOCITY MODE - In this mode of operation, a circuit on the
personality module looks at the hall sensors and generates a simulated velocity
signal which is used to close a velocity loop in the amplifier. This mode of operation
offers an extremely cost effective velocity mode system for medium to high velocity
applications. Please see section 2.6 of this manual for more detailed information.
• CURRENT MODE - In this mode of operation, which is also commonly referred to as
torque mode, a current in the motor is produced which is directly proportional to the
input signal. Please see section 2.2, 2.5, 2.7 of this manual for more detailed
information.
• Sine/Resolver Mode (SMA8230) - In this mode of operation, a brushless motor with an
integral resolver is required. The personality module contains a resolver to digital
converter which provides the positional information to the amplifier that is required to
commutate the motor. This positional information is also used by the personality module
to emulate a quadrature encoder output. This personality module can be configured for
the following two different types of operation:
• VELOCITY MODE - In this mode of operation, the personality module generates a
tachometer signal which is used to close a velocity loop in the amplifier. Please see
section 2.3, 2.5, 2.8 of this manual for more detailed information.
• CURRENT MODE - In this mode of operation, which is also commonly referred to as
torque mode, sine wave currents in the motor are produced that are directly
proportional to the input signal. Please see section 2.5, 2.7, 2.9 of this manual for
more detailed information.
• Two/Three Phase Input Current Mode (SMA8330) - In the two phase current mode, the
amplifier generates three sine wave currents that are proportional to two input signals.
This third command is generated on the personality module as the negative sum of the
other two signals. In the three phase current mode, the amplifier generates three sine
wave currents that are proportional to three input signals. Please see section 2.5, 2.9 of
this manual for more detailed information.
CHAPTER 1: DESCRIPTION, FEATURES AND SPECIFICATIONS