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How Does Closed Loop Control Work in a VFD?

In our latest YouTube videos, we discuss how adding encoder feedback allows the drive to more precisely control the speed and torque of the motor. In this article we’ll talk about the more advanced Closed Loop control for precise control of the motor’s speed and torque. (you can also watch the video and Mike will walk you through the concepts) V/Hz Open Loop Control Using open loop control with a VFD is an effective and low cost way to control a motor.  In an induction motor, if the ratio of supply voltage and frequency is constant the magnetic flux and...
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How a multi-axis auxiliary inverter solution can benefit your EV design

When it comes to electrifying vehicles, there are several components which become de-coupled from being driven by the engine such as air compressors, steering pumps and air conditioning compressors. In this case, each component can be operated independently with its own auxiliary electric motor. Likewise each auxiliary motor can be controlled by its own inverter, or variable frequency drive, based on the needs for on-demand performance as well as optimal operational efficiency.  This, of course, requires multiple VFDs and begs the question of which inverter layout or topology is the most beneficial for the vehicle design.  Several considerations for electrifying the...
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What Are the Main Components of a VFD?

The components of a VFD (Variable Frequency Drive) consists of two main sections – the power stage and control circuit.  Previous videos on KEB’s YouTube page showed how the input rectifiers, DC bus capacitors, and output IGBTs sections of the power stage convert the AC line voltage to a Variable Voltage Variable Frequency (VVVF) AC output to the motor.  In our latest video, we discuss the control circuit which handles logic and can be considered the brains of the drive. On KEB’s F5 drive, the control card has a few main components.  The first is the internal connection to the...
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Remote Access to Mitsubishi PLCs

This article will review how to gain remote access to a Mitsubishi PLC using KEB’s C6 Industrial VPN Router. Specifically, we will connect to a FX3GE-24M PLC using an Ethernet connection. The process outlined below takes about 10 minutes to get set up. The necessary hardware and software programs are : Combivis Connect C6 VPN Router FX3GE-24M GXWorks2 Software System Architecture Router Configuration The C6 Router can be configured using two different methods to remote program your Mitsubishi PLC. Configuration is possible using a local network connection or from an exported configuration data file via USB. Regardless of the method...
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The robotic, automated workforce

The automated workforce and future of automation is what we do here at KEB. Being a part of that industry means we need to be aware of the concerns that plague both supporters and detractors of robots and co-bots. According to a recently published New York Times opinion piece, the tax bill enacted in 2017 has huge incentives for companies looking to invest in robotics and automation. The author goes on to suggest that this means a robotic, automated workforce is on its way (or already here), and is primed to displace an at-risk demographic of workers – that is,...
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Auxiliary inverter solutions for fuel cell vehicle turbo compressor applications

When it comes to electrifying auxiliaries with inverters in commercial electric vehicle applications, the use of high speed motors on turbo compressors for fuel cells pose some unique challenges.  In this article, I’ll give a brief overview of fuel cells, how they work, and their application in commercial electric vehicles and go on to discuss some of the unique challenges which must be considered when selecting an inverter for these applications and how they can be overcome. Fuel cell technology has its place in the electric vehicle world and I intend to provide some insights into what makes these applications...
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