Detailed data :
| Brand : | Panasonic | Model : | MADDT1205 |
| Input : | 200-240v | Phase : | single |
| Current : | 1.3A | Frequency : | 50/60Hz |
| Output : | 69.4v | Phase : | three |
| Current : | 1.2A | Frequency : | 0-333.3Hz |
| Power : | 100w | Place of original : | China |
MADDT1205 Panasonic 0-333.3Hz Rated Frequence Output AC Servo
Driver
The function of a servo amplifier is to compare, amplify, and
calculate the input command signal (voltage) with the system
feedback signal (voltage), and output a deviation voltage signal
Proportional control current is applied to the torque motor control
coil of the servo valve, controlling the opening of the servo valve
core and providing amplitude limiting protection.
Parameter requirements for servo amplifiers
As an electronic device for driving electro-hydraulic servo valves,
servo amplifiers have certain requirements for their corresponding
parameters:
(1) The input voltage is within ± 10 V, which facilitates the
control of command components such as computers and programmable
controllers:
(2) Output current ± 10-+100n approved adjustment to adapt to
various models of torque motor servo valves;
(3) The linearity error of the servo amplifier is less than 3% Fs;
(4) Having a feedback access terminal to form a closed-loop control
system;
(5) To adapt to the high-frequency response characteristics of the
servo system, the servo amplifier has a bandwidth greater than 1200
Hz;
(6) It has the function of limiting large output current and
protecting against output short circuits, which can limit the large
flow rate of servo valves and prevent faults caused by output line
short circuits.
The principle of servo amplifier
The servo amplifier is composed of modules such as command and
feedback comparison processing, zero adjustment circuit, current
limiting circuit, preamplifier, power amplifier, etc. Its
structural diagram is shown in Figure 2
As shown in.
The function of the preamplifier circuit is to compare and amplify
instructions and feedback input signals. The circuit K Fbk
represents the input signal and feedback signal, respectively
Adjust the circuit gain through the potentiometer to meet the
requirements of the power amplifier circuit, so that the circuit
voltage can match the front and rear stages.
The function of the zero adjustment circuit is to adjust the
circuit reference voltage by adding an adjustable voltage to the
preamplifier circuit. By adjusting the potentiometer to compensate
for zero bias
Server amplifier system bias.
The function of the current limiting circuit is to limit the large
current flowing through the servo valve coil, avoid coil overload,
protect the servo valve, and limit the large flow rate of the
hydraulic system. This circuit is composed of an operational
amplifier
ULD, U2A, diode D D: And adjustable voltage source through
potentiometer R., Adjust the amplitude of the input voltage of the
power amplifier stage to reach the limit output
Current output purpose. The function of a power amplifier circuit
is to convert and amplify a low-power voltage signal into a
high-power current signal, in order to provide sufficient servo
valve rating
The current is used to drive the load, and it requires good
anti-interference ability and static and dynamic performance. This
circuit utilizes the poles of NPN and PNP type transistors to
generate
The stages are interconnected, with signals input from the base and
output from the emitter. The circuit can be seen as a combination
of two emitter outputs, forming a push pull power amplifier
The circuit operates within the positive and negative half cycle of
the input signal. In addition, a high-frequency rated vibration
signal generated by the 8038 chip can also be added to the output
current to improve
High servo valve resolution and prevention of valve core sticking
due to Coulomb friction.
Calculation of output current of servo amplifier
The servo valve coil is the load of the servo amplifier, which is
equivalent to the inductive impedance composed of 0.3H inductance
and 800 resistance. In order to make the output control current of
the power stage proportional
Dry input voltage signal, using an electric cathode. Connect with
the load coil and feedback the voltage on it to the inverter input
of the amplifier through the cathode, achieving closed-loop control
Control and adjust the output current of the power stage, because
the feedback voltage of the power stage is generated by the
current, it is called current negative feedback. After introducing
current negative feedback, the rated voltage
Within the load range, the change in load impedance does not affect
the change in output current of the power stage, and the servo
amplifier acts as a constant current source.
The function of the preamplifier circuit is to compare and amplify
instructions and feedback input signals. The circuit K Fbk
represents the input signal and feedback signal, respectively
The gain of the circuit is adjusted through the potentiometer to
meet the requirements of the power amplifier circuit and make the
circuit voltage match the front and rear stages.
The function of the zero adjustment circuit is to adjust the
circuit reference voltage by adding an adjustable voltage to the
preamplifier circuit. By adjusting the potentiometer for zero
offset compensation, the signal
Server amplifier system bias.
The function of the current limiting circuit is to limit the large
current flowing through the servo valve coil, avoid coil overload,
protect the servo valve, and limit the large flow rate of the
hydraulic system. This circuit is composed of an operational
amplifier
ULD, U2A, diode D D: And adjustable voltage source through
potentiometer R., Adjust the amplitude of the input voltage of the
power amplifier stage to reach the limit output
Current output purpose. The function of a power amplifier circuit
is to convert and amplify a low-power voltage signal into a
high-power current signal, in order to provide sufficient servo
valve rating
Current to drive the load. And it requires good anti-interference
ability and static and dynamic performance. This circuit utilizes
the base and emission of NPN and PNP type transistors
The stages are interconnected, with signals input from the base and
output from the emitter. The circuit can be seen as a combination
of two emitter outputs, forming a push-pull power amplifier
The circuit operates within the positive and negative half cycle of
the input signal. In addition, a high-frequency flutter signal
generated by the 8038 chip can be superimposed on the output
current to improve
High servo valve resolution and prevention of valve core sticking
due to Coulomb friction,
The output current of the servo amplifier is calculated as the load
of the servo valve coil, which is equivalent to the inductive
impedance composed of a 0.3 H inductance and an 80 Q resistance
The output control current of the power stage is proportional to
the input voltage signal, and a resistor is used. Connect in series
with the load coil and feedback the voltage on it to the amplifier
through a resistor
The reverse input terminal of the power cooling stage achieves
closed-loop control and adjusts the output current of the power
stage, because the reverse voltage of the power cooling stage is
generated by the current, it is called current negative feedback.
already
After the negative feedback of the input current, within the rated
load range, the change in load reactance basically does not affect
the change in output current of the power stage, and the servo
amplifier is equivalent to a constant current source.
Terms:
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inspection.
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Linture Technology Co,. Ltd
Contact person: Vivian
E-mail: linture0319@163.com
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