DC servos are similar to AC servos in that they can be controlled by an open-loop controller, a semi-closed-loop controller, or a fully closed-loop controller.
The structure of the DC servo system control panel is as follows: the right side of the panel is the interface with the DC servo motor interface board, including the motor drive interface and the encoder interface; the left side is the interface with the motion controller panel, including the position control mode interface and the speed control mode interface.
The M+ and M- signals are the power lines for the brushless DC servo motor , used to drive the motor's movement.
The A+, A-, B+, B-, C+, C-, 5+, 0V signals are encoder signals used to provide feedback on the actual position of the motor shaft.
A,/A,B,/B,C,/C,+5V,PUL+,DIR+,OGND,OVCC,GND,DAC,RESET,ALM,ENABLE are control signals connected to the controller.
Its meaning is:
A,/A,B,/B,C,/C are encoder signals fed back from the driver to the motion controller.
+5V is the power supply.
PUL+ and PUL- are pulse signals used for motor control in position mode.
DIR+ and DIR- are direction signals used for motor control in position mode.
OGND, OVCC, and GND are analog ground, analog power supply, and digital ground, respectively.
The DAC is an analog control signal accepted by the driver, typically ranging from -10V to 10V.
RESET, ALM, and ENABLE are control signals that represent the driver's reset, alarm, and enable functions, respectively.
DC servo drives typically have speed control mode and position control mode.
In position mode, the input control signal is a pulse and direction (or positive and negative pulses); in speed mode, the input control signal is an analog signal. The driver converts the input signal into a speed control signal, which is then converted into a current control signal by the speed controller. The current signal is applied to the output module of the power amplifier module through the PWM loop and finally supplied to the motor.
The DC servo drive uses an IDM intelligent servo drive.
The IDM240/640 is an embedded intelligent, high-precision, fully digital servo driver that can drive square wave or sine wave brushless servo motors (PMSMs) and DC servo motors. It can be configured into a distributed intelligent network motion system with up to 256 axes via CAN or RS-485 interfaces. The embedded advanced programmable motion language (TML) provides a variety of advanced motion control and PLC-specific functions.
The main features are as follows:
Distributed intelligence, single-axis master control operation or slave axis mode
Control modes: position, speed, torque, voltage, external variables
Sport modes: Pulse + Direction, Electronic Gear, Profiling, Contouring
Programmable protection: position error, overcurrent, overvoltage or undervoltage, I²t.
DSP control technology: based on MotionChip™ technology
RS232/485 serial interface, baud rate up to 115KB
CAN2.0 local area bus, compatible with CANopen, baud rate up to 1MHz
Output current: Continuous current 5A/8A, peak current 16A.
Power supply voltage: 12-48VDC (IDM240), 12-48VDC (logic power) / 80V (motor) (IDM640)
Compact structural design: 136x84.5x26mm
The control software uses EasyMotionStudio, and its features are as follows:
The advanced graphical evaluation and analysis programming tool EasyMotionStudio platform allows for quick setting of motor and driver parameters and programming of motion programs. The TML_LIB function library is a function library for intelligent servo drives to execute motion control applications on a PC. After calling the .DLL files in the library in applications developed in C/C++, Basic, Delphi, and LabVIEW, they can directly communicate with the driver, set parameters, query status, send commands, define motion events, and test the status of input and output ports.
StarterKit for IDM640: A complete component containing an IDM640 driver, a motor, an I/O board, EasyMotionStudio software, and application help and complete documentation. It's the ideal experimental platform for testing your motion control programs. All of the above is included in a ready-to-use, plug-and-play component.
A DC servo motor includes the following components:
Stator: Magnetic field—permanent magnet
Rotor: Armature winding
Commutation: Commutator and carbon brushes
The DC power supply applied to the DC motor, with the help of the commutator and brushes, makes the current flowing through the armature coil of the DC motor alternate in direction, so that the direction of the electromagnetic torque generated by the armature remains constant, ensuring that the DC motor rotates continuously in a certain direction.
Advantages of DC servo:
• Precise speed control
• The torque-speed characteristics are very stiff.
• Simple principle and easy to use
• Price advantage
shortcoming:
• Brush commutation
•Speed Limit
•Additional resistance
• Generates abrasive particles (for cleanrooms)
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