3 phase power converter1/17/2024 ![]() The biggest enemy of an electric motor is overheating: 1) overloading, 2) under voltage, 3) dirt insulating motor, 4) over-greasing bearings.Ībout variable freq drives: 1) I have not seen any in trade magazines that can run a 15 hp motor on single phase. ![]() Better yet is torque-an 1800 rpm electric motor can be loaded for 100% service at 3 ft-lbs per hp. Not only does this solve your 3 phase problem but it also allows you to adjust the motor/blade speed as circumstances require.Ī general rule for electrical vs. That is great.Īs to 3 phase, I think the suggestion about the use of an inverter is excellent. The result is near instantaneous torque upon demand-no need to slow down when approaching a large knot. For practical concerns, there is no lag with an electric motor. When your gas or diesel motor receives additional load (like cutting through a large knot in the middle of a cut), the engine has to slightly slow before the governor responds by sending more fuel to the engine and the RPM is restored to the shaft. There is a noticeable difference in cutting speed due to increased torque and faster delivery of it. In a nutshell, operating costs will be less generally speaking, especially when life and maintenance is factored in (maintenance is greatly reduced). I converted my LT40HDG to an entirely electric mill over 8 years ago (240volt/3 phase delta). I'm sold enough on it that I'm converting our grain dryer on the farm from PTO driven to 3 phase powered by a rotary converter. Luckily, putting in 3 phase didn't cost us anything. The voltage should be within + or - 5% of each leg for best operation.Ĭonverting from gas to 3 phase was a great move for us in our stationary mill. If you buy a converter, make sure it is designed for a converter and that the outputs are balanced. This is what is causing the motor to scream in above posts. The leg this motor supplies may have incorrect voltage and phasing. The problem with this system is that the legs are not balanced correctly electrically. They have a capacitor network to start the motor turning, the single phase is connected for 2 legs of the 3 phase and this rotating motor is used for the 3 leg. They are made by using a 3 phase motor to supply the missing leg. ![]() Check with you local power company to make sure there is enough power. We do have weak power, and that is why we only have a 15 hp on the WM. We are at the end of our power line and the substation is 9 miles away. We installed a Ronk 50 hp phase converter, and also operate a 10 hp electric Morgan edger. We went from over $400 in gas to under $100 in electric each month. Three years ago we converted our LT40HD from 24 hp gas to 15 hp electric. The cost will shock you, if not the wiring. contactors, disconnect, etc., all weather-resistant, and a weather-resistant electrician to install it. However, the factory 25 hp motor whines like a jet engine and is no quieter than a gas engine.ĭon't forget to price out and budget for mag. It too runs off a rotary phase converter. Also, I've seen another Wood Mizer LT40HDE25 in operation. As my present needs require portability, I have re-installed the 35 hp gas engine, but I will return to the 25 hp motor in the near future. The total installation cost was under $1000. The 25 hp motor was purchased used along with a new rotary converter from Roe Electric in Toledo, OH. He had set up a rotary phase converter and was sawing faster, quieter and cheaper than with the gas engine. I recently bought a used Wood Mizer LT40HDG35 bandmill that the previous owner converted from the factory Wisconsin 35 hp gas engine to a 25 hp 3 phase. You get about 10-12 kWh per gallon of oil. Of course, running a generator may make sense depending on kWh cost. The motors will run cooler and last longer. You get much "cleaner" power and eliminate the "wild leg" problem. ![]() This is not directly related to sawmills necessarily, but take a good look at using a variable frequency drive instead of a rotary phase converter. with 3 phase motors of this size range with a rotary phase converter, especially anyone that has switched from gas or diesel to 3 phase electric (converted or not). We would like to hear from anyone that has experience running a sawmill and edger, etc. So I know what they are and where to get them. I’ve done considerable study on rotary phase converters and have seen two homemade converters in use (but not on sawmills). If we decide to do this, we would also upgrade or convert our edger to a 15 hp 3 phase unit.Īs we only have single phase available and it would be cost prohibitive to get 3 phase service to our farm, we’d need a rotary phase converter. We are considering upgrading to a 25 hp Wood Mizer 3 phase electric mill. ![]()
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