Nanomotion AB2, Руководство пользователя

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AB2 Description
Operating Principles
Nanomotion Ltd.
2
1.3 Operating Principles
The AB2 Box consists of a single card (command source) that converts the input
command signal into a corresponding PWM output signal. In this mode the
output transformer-amplifier circuit converts the PWM output signal into a high
voltage sine wave that drives the motor. The PWM controller is power-fed from
an internal DC-to-DC converter that is fed from an ex24V power supply.
The AB2 card consists of DC/DC converters that provide the voltages necessary
to operate the amplifier circuit: +5V,
±
12V. In addition, the card contains two
indicators LED’s and the external interface connectors for the CONTROL,
MOTOR, and I/O signals.
Figure 1 illustrates a typical application of the AB2 Driver Box.
Figure 1: AB2 Block Diagram
This square wave from the PWM Controller is filtered through the serial
inductance circuit and fed to the push-pull transformer circuit to produce a sine-
wave high output voltage on the secondary coil of the transformer. The
secondary coil and the motor capacitance serve as the LC resonance circuit.
The motor is a three-terminal component: “UP”, “DOWN” and “COMMON.” The
voltage applied between the “UP” and “COMMON” terminals causes the motor to
move in one direction; while voltage applied between the “DOWN” and
“COMMON” terminals causes the motor to move in the opposite direction. Figure
2 is a schematic drawing of the power output.
Power Supply
DC-to-DC
Converter
Input Amplifier and
PWM Controller
NM Motor
PWM Transformer
Push-Pull
Resonant Driver
Command
Source
24VDC
PWM Output
AB2
+5V,
±
12V
High Voltage