Press Release: Siemens researchers have developed a new type of electric motor that, with a weight of just 50 kilograms, delivers a continuous output of about 260 kilowatts – five times more than  comparable drive systems. This record-setting propulsion system successfully completed its first public flight today at Schwarze Heide Airport near Dinslaken, Germany, where it – almost silently – powered an Extra 330LE aerobatic airplane. The new drive system had already made its maiden flight on June 24th 2016. This advance means that hybrid-electric aircraft with four or more seats will now be possible. In addition, the company will be contributing this technology to the cooperative project that Siemens and Airbus agreed to in April 2016 for driving the development of electrically powered flight. Electric drives are scalable, and Siemens and Airbus will be using the record-setting motor as a basis for developing regional airliners powered by hybrid-electric propulsion systems. Siemens is determined to establish hybrid-electric propulsion systems for aircraft as a future area of business.

Sometimes your six lead motors are configured to start in a Wye configuration and switch to a Delta configuration during the start-up known commonly as Wye Start/Delta Run. This starting method minimizes current demand during starting and reduces the impact on the power system, therefore, reducing the chance of the motor tripping off-line in a distressed power system. As motor analysts and technicians we need to remember that when de-energized the three phases are completely disconnected from each other. Connecting your MCE® test leads to motor leads 1,2,3 will indicate an open phase with no conductivity. The recommended approach is to move your test leads to each phase and test that phase separately. Referring to the handy dandy EASA Electrical Engineering Handbook we can determine which motor leads make up the three independent phases. Motor lead 1 and 4 (phase 1), motor lead 2 and 5 (phase 2), and motor lead 3 and 6 (phase 3). Also, remember that each phase can have its own independent resistance and capacitance-to-ground reading as a result of being disconnected from the other phases.
From our friends at PdMA.

You guessed it. Excessive temperature is the #1 killer of electric motor insulation. However, not always does the remaining evidence lead the investigator to the root cause. So what could be the root cause of excessive heat?  High resistance connections, severe rotor bar defects, improper ventilation, poor power quality, etc. With so many root causes resulting in high temperatures it is no wonder heat is the #1 killer of your electric motor. Get a handle on these root causes with your pdm technologies and you will get a handle on the heat. Info courtesy of our friends at PdMA.

 

It is time to get generators and motors ready for the long hot summer. For many this includes cleaning their critical motors and generators for the upcoming summer months.

Carbon Dioxide (CO2) (Dry Ice) cleaning has been gaining in popularity for many large machine users to accomplish this dirty and time consuming task.

Dry Ice blast cleaning for generators and motors can be used for:

• Removal of carbon deposits
• Removal of grease/oil build up
• Cleaning of buss bars, Stator, Stator Core, Rings, Windings, and other components

Among the advantages reported include:

• Reduced chemical usage (reduced V.O.C.
• Increased speed in the cleaning process
• Dry ice blast is non-abrasive compared to conventional methods
• No drying time

Dry ice blasting is best used for loose service contamination on hard non-porous surfaces. Depending on the skill of the operator, the contaminates are reduced considerably on the first pass and nearly eliminated after two or three more passes. Dry ice blasting can be completed much faster than other conventional processes using walnut shell, corn cob, or baking soda as an abrasive. While the actual time spent performing the blasting (cleaning) may be longer, the minimal drying time and clean up once the work is completed makes this a much more efficient option for cleaning your machines.

While dry ice blasting has several advantages it also has its limitations. The blasting requires a line of sight for the operator, and some areas of a machine cannot be cleaned even with the many new cleaning nozzle designs available. So there most likely will always need to be some machine disassembly.

The last possible disadvantage of dry ice blasting is the skill level of the operator. With dry ice blasting if the CO2 pellet size is too large and/or the pressure too high the process becomes too aggressive and can damage insulation and coating systems. So verification of your service provider’s qualification and training program for their operators is a must prior to bringing this cleaning method into your plant.

– Article provided by our friends at PdMA. Contact us for all of your PdMA MCE testing and preventive maintenance needs!

 

Siemens was the first to begin large-scale manufacturing of copper rotor motors, and with efficiency as high as 93.7%, Siemens copper rotor technology is second to none in energy savings today.  These industry workhorses are ideal for use in the chemical processing, mining, foundry, pulp and paper, waste management and petroleum/chemical applications. They are available with a wide selection of application-matched modifications to meet specific needs, ambient conditions and installation requirements. They are available with NEMA Premium® operational efficiencies as standard or NEMA Premium PLUS efficiencies. For rugged and efficient operating performance – you can depend on Siemens. To Learn more, click HERE.  18