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Motor thermal protection

Thermal winding protection for motors is a key component in operational automated equipment. This creates a level of protection against excessive winding temperature that could eventually lead to permanent winding insulation breakdown and failure.  EASA has a nice page with some good pictures of typical motor failures – you don’t want this to be you.   Let’s visit a hypothetical example – a manufacturing company utilizes a servo motor on a new assembly machine. The machine begins running well but then the company decides they need faster output so the motor’s duty cycle is increased. Over some time, the higher...
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Regen Drives for Cranes and Hoists

A crane hoist is a prime application example of a motor that cycles back and forth between motoring and generating mode?  When the crane lifts a load, electrical energy is delivered from the utility to the motor and it goes into “motoring mode”.  As the load is lifted, potential energy is stored in the system.  The amount stored depends on the mass of the load and how high it is lifted.   Eventually, when the load is lowered – the motor goes into “generating mode” and the energy from the mechanical system flows back into the VFD in the form of...
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T6 Auxiliary Inverter now available for NA market

FOR IMMEDIATE RELEASE   SHAKOPEE, MN – KEB America announces the release of the new T6 Auxiliary Inverter for the North American market. Pre-series production of the drive ran in October, and the first series release is now scheduled. KEB is excited to bring this new technology to the field of commercial electric and hybrid electric vehicles.     The new T6 drive from KEB is a multi-inverter system specially designed for the auxiliary motors in commercial electric vehicles such as compressors, pumps, and ePTO. The drive is capable of powering up to six electric motors with three different power...
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Application of NAT rules with the C6 Router

Modern industrial machines are constantly generating data that can be harnessed to improve business outcomes. Insights from machine data can be utilized to reduce machine down time, increase machine efficiency and even prevent machine faults. Although the availability of data from machines is readily available, many challenges prevent the collection of this data from the machine network. Challenges such as limited computing resources or security vulnerabilities can prevent the utilization of valuable machine data.   A specific challenge seen across many applications is the requirement for a private machine network (LAN) to connect to a public network (WAN) such as...
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Reducing Audible Noise in VFD applications

Some VFD applications require there to be as little audible noise as possible.  Theatre hoists, elevator drives located next to a Penthouse suite, and testing machines for audio equipment are all projects I have worked on that had strict noise requirements.  This post describes the common sources of audible noise and 4 things a user can do to reduce noise in their VFD application.   Audible Noise The first point to make is that I am talking about audible noise, not high-frequency electrical noise.  A good rule of thumb is that the human ear has a frequency range from 20Hz...
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T6 Auxiliary Inverter Case Study – Electric School Bus

In a previous post I provided an overview of electrifying auxiliaries with VFDs. Here, I will provide a practical example in the application of an electric school bus as well as dive deeper into some of the benefits.   Coming back to the concept that zero-emission, all-electric vehicles will not have a constantly running engine to provide power to the auxiliaries. This begs the simple question of what would typically need to be motorized and electrified in these applications and how does a variable frequency drive (VFD) solution provide further benefit?   In our example of an electric bus, the...
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