概述
Motor Control Functions | ||||
Motor Control Functions | ||||
Drives | SINAMICS S Multi-axis | |||
SINAMICS G | SINAMICS S Single-axis | |||
Control mode | VectorControl | ServoControl | ||
Standard DriveControl | DynamicDrive Control | ExpertMode | ||
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Required data | Rated speed and rated current | Rated speed, rated current and rated power | Depending on commissioning routine | Depending on commissioning routine |
Focus | Easy & fast commissioning for the untrained user | Simplified commissioning for most applications | Maximum performance for the expert user | Maximum performance for the expert user |
The control methods are the core of the entire converter firmware.They are responsible for optimum movement of the connected motorand the attached machines.
The better the control functions, the faster, better and moresmoothly the machine operates, thereby significantly enhancing thequality of the production output.
Open loop controlThe V/f open-loop control characteristic is the simplest way tocontrol an induction motor.
Several different characteristics, e. g. linear or parabolic,can be configured.
In addition, basic functions like slip compensation, voltage boostor resonance damping are supported.
Universal closed-loop control (Vector Control)The vector control emulates the motor as precisely as possible toobtain the best results regarding control precision and controlquality.
For most applications and motors, the closed-loop vector control isthe perfect choice. It is optimized for both Siemens and 3rd partymotors.
Unknown motors – regardless of the technology (induction,synchronous reluctance, permanent magnet synchronous) – can beidentified and commissioned easily.
The vector control is characterized by features like
Best speed accuracy
Best speed ripple
Best torque accuracy
Best torque ripple
Optimized for control with or without encoder
In the servo control mode, the connected motor is emulated in avector model based on its equivalent circuit diagram data.
Consequently, the servo control constitutes a field-orientedcontrol. In contrast to vector control, the vector model isoptimized according to other criteria in servo control.
In favor of achieving a high dynamic performance, a smalldeterioration in the control accuracy and control quality isaccepted.
Special features of the servo control include
Maximum computing speed
Shortest sampling times
Maximum dynamic performance
High output frequencies
Preferably used with permanent magnet synchronous motors withencoder for the appropriate dynamic performance
Both servo and vector control share some common used control-loopstructures:
Extended brake control. It allows complex brake controls, suchas for motor holding brakes and service brakes.
Setpoint channel. It is the link between the setpoint source andthe motor control. The converter has a special feature thatsupports simultaneous input of two setpoints. Generation andsubsequent modification of the total setpoint (influencing thedirection, skip frequency, up/down ramp) take place in the setpointchannel.
Command sources. Different sources of command usually resultfrom the requirements to operate a drive from different places(on-site/remote), in different situations (standard/emergency mode)and/or different operating. The BICO binector connector technologyallows SINAMICS to configure and combine the command and setpointsources completely individually.
Limiters or limits are used to constrain input and/or outputvariables as appropriate to the connected machine; this means thatnot all positioning variables are used over their full range butare limited judiciously to enhance the safety and quality of theproduction process.
Pulse frequency & modulation.
Several different pulse frequencies possible to adjust the drive tothe application including asynchronous pulse frequencies tominimize derating and mechanical resonances.
In addition, wobbling is available to generate a more pleasantacoustic experience.
