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Some manufacturers' inverters can provide 100% torque at Zero speed without an encoder. A properly rated and designed motor can be provided to operate at Zero speed, full torque (often called 1000:1 speed range motors). This is a very typical motor requirement for Paper Winders and Rewinders, and Steel Coilers and Uncoilers.
Generally frequency inverter has following control modes: open loop vector control, V/F control, open loop torque control, closed loop vector control, slip frequency control.
Open-loop vector control inverter
Apply to high performance general-purpose application with no PG encoder, one frequency inverter controls an electric motor only. Such as machine tools, centrifuge machines, wire drawing machine, injection molding machine, etc.
Open-loop vector control inverter
Apply to high performance general-purpose application with no PG encoder, one frequency inverter controls an electric motor only. Such as machine tools, centrifuge machines, wire drawing machine, injection molding machine, etc.
Generally, there are dozens of function parameters in frequency inverter, or even hundreds for option. In practical application, it is not necessary to set every parameter, most parameters can be keep factory default settings.
High quality frequency inverters for electric motor speed controls in energy-saving solutions.
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Frequency Converter for Pumps
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50Hz motor running on 60Hz power supply
Single phase to three phase converter
Frequency converter typical shortcomings
Frequency Converter Troubleshooting
Frequency inverter, the best energy saving solution
Does Frequency converter better than control valves in flow controls
Frequency Converter for Pumps
Why AC motor needs a Frequency Converter?
Determining frequency converter size
Frequency inverter energy efficiency calculation
Frequency inverter for heavy duty application (mining)