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1. Introduction
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This section is to introduce the Megathrust Motor System in general. Some part of explanations
are not applicable to all Driver Unit and/or Motors. Refer to respective specifications when
ordering.
1.1. Overview
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The Megathrust Motor System is a unique actuator with special capabilities. The System consists
of almost all elements that are needed for a complete closed loop servo motor system. With
conventional technology these parts must be purchased and installed separately, but the
Megathrust Motor System incorporates them all into two units; the Motor and the Driver Unit.
Motor
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The Motor consists of a high thrust force brushless actuator, a high resolution brushless resolver,
and heavy duty precision NSK Linear Guides. The high thrust force actuator has a simple
structure, while the built-in resolver usually makes feedback components, such as encoders
unnecessary. Finally the heavy duty Linear Guides eliminates the need for separate mechanical
support since the Motor case can very often support the load directly in most applications.
Driver Unit
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The Driver Unit consists of a power amplifier, resolver interface, and digital motor control
circuits. The Driver Unit provides everything that is needed to control the Motor’s force,
velocity, or position; for interface to any standard motor position controller or to act as a stand-
alone digital motion control system with its built-in zero backlash position control capability.
High Speed
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The Driver Unit features higher speeds than ever before... with less force drop-off at the
intermediate speeds. As a result, smaller Motors may be used for high speed positioning
applications when the thrust requirement is primarily for acceleration.
Ease of Use
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The digital control makes the System easy to use, for more than one reason:
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The circuit parameters can be changed by an RS-232C command, rather than by
attempting to adjust a multi-turn pot or changing capacitor values. The parameter
changes are not only a breeze to make, but they are measurable and repeatable, so that
every System behaves the same way, every time.
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The versatile design means that significant changes in the Driver Unit function can be
made with little or no hardware changes. Numerous options are available at little or no
extra cost.
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Stand-alone capability means that the Megathrust Motor System can be operated in
position control mode without the need for a separate CNC or position controller.
Built-in software for flexible motion control means that the complexity of the
electronic system can be cut in half. This reduction of the controls circuitry to one
component saves time and money.
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