Clarence Klassen posted a blog post
Rotor -Yellow Submarine Original Artwork copyright 2013The rotor is the moving part of an ac induction motor and is subject to the greatest number of faults. These include:Thermal overload, unbalance due to contamination or abrasionHigh rotor losses…
Jan 13
Clarence Klassen posted a blog post
Stator-Yellow Submarine Original Artwork copyright 2013There are several types of motor stator failures. These include:Turn to turn short due to voltage spikesTurn to turn short due to defective insulationPhase to phase fault due to excessive temper…
Jan 6
Clarence Klassen posted a blog post
Bearings-Yellow Submarine Original Artwork copyright 2012There are several types of motor or roller bearing failures. These include:Fluting due to shaft currentsPitting due to shaft currentsSmears due to debrisFretting corrosion due to lose fit or v…
Dec 17, 2019
Clarence Klassen posted a blog post
I can't tell you how many times I have seen people working with open drive cabinets. Bare knuckles, no glasses or shield, uninsulated tools. In fact, I might guilty of this as well. When I started working with electrical equipment in the 1970s, we h…
Dec 9, 2019
Clarence Klassen posted a blog post
Compromise-Yellow Submarine Original Artwork copyright 2012The design and commissioning of a drive often involves balancing competing parameter settings (tradeoffs). A few considerations are listed below.The ramp rate for speed should be as fast as…
Nov 28, 2019
Clarence Klassen posted a blog post
SRamp-Yellow Submarine Original Artwork copyright 2012An S Ramp for the speed setpoint is usually required to maintain proper tension on a line where a good product is produced while the speed is changed. This applies to slitters and most converting…
Nov 18, 2019
Clarence Klassen posted a blog post
HareAndTortoise-Yellow Submarine Original Artwork copyright 2012The fastest Web Handling machine I have worked on is 3048 MPM (10000 FPM). This was a paper slitter winder and was for a short time the world speed record holder. Before this machine wa…
Nov 11, 2019
Clarence Klassen posted a blog post
Gear-Yellow Submarine Original Artwork copyright 2012We would prefer to operate Web Handling drives without speed reducers. The drive and tension control see each tooth engage. Additionally, the speed reducer introduces measurable losses. In fact, i…
Nov 4, 2019
Clarence Klassen posted a blog post
Runaway Truck-Yellow Submarine Original Artwork copyright 2012Many of our drives run in torque control. Torque control provides very good control of tension. Torque control becomes a safety concern if the web breaks and torque control is permitted t…
Oct 28, 2019
Clarence Klassen posted a blog post
 We use electric motors and drives in Web Handling because the torque can be controlled so well. Induction motors are typically used. By itself, an induction motor has a predictable torque curve, but this curve is not suitable when a specific speed…
Oct 22, 2019
Clarence Klassen posted a blog post
Meter-Yellow Submarine Original Artwork copyright 2012Motors have two useful outputs – RPM and torque. Motors have two inputs – volts and amps. Actually, ac motors have three inputs volts, frequency, and amps. Ac motors must maintain a close relatio…
Oct 16, 2019
Clarence Klassen posted a blog post
E-Stop-Yellow Submarine Original Artwork copyright 2012Emergency Stops have been required on machinery for a very long time. The current definition for E-Stop is provided in ISO 13850 – Safety of Machinery – Emergency Stop – Principles for Design an…
Sep 30, 2019
Clarence Klassen posted a blog post
The Pulse Width Modulation (PWM) drives can create motor overvoltage failures due to differential mode transient voltages. This is a well-known problem since AC VSD's were introduced. Specify motors insulated for Adjustable Speed Drive application.T…
Sep 24, 2019
Clarence Klassen posted a blog post
Mine Hoist-Yellow Submarine Original Artwork copyright 2012Web Handling is a small player (<10% of the market) for Variable Speed Drives. Most of our drives are used in fractional or low power applications. High-Power drives (0.4 to 200 MVA) are use…
Sep 16, 2019
Clarence Klassen posted a blog post
Diameter-Yellow Submarine Original Artwork copyright 2012Of all the features of a drive system, the most popular by far is stop to diameter. A few weeks ago I wrote about stopping to length. Stopping to diameter is a bit more complicated than stoppi…
Sep 9, 2019
Clarence Klassen posted a blog post
Noise-Yellow Submarine Original Artwork copyright 2012Electrical noise is anything that degrades a measurement in the electrical control system. Noise can be of any frequency. Sources of noise may be the power supply, improper grounding, improper sh…
Sep 4, 2019
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