Members hyttogpine Posted July 13, 2015 Members Report Posted July 13, 2015 400 watts. 746 W / HP so this is 400 / 746 = 0.54 HP Tom northmountYour calculation - watts to HP - will it be the same, whenever we taking about 110 or 220 voltage ? I have an old Singer motor (on a heavy 45K25). Is it possible that these motors is constructed to be weird as 3-phase alternative 1-phase? Quote
Northmount Posted July 14, 2015 Report Posted July 14, 2015 Power in watts = voltage x current (amperes) x power factor. This is true for all single phase AC services. Power factor for an induction motor is typically in the range of 0.65 to 0.8. For three phase circuits multiply the above result by 1.732 (the square root of 3). Tom Quote
Members hyttogpine Posted July 14, 2015 Members Report Posted July 14, 2015 I'm sure you meant it well and I'm sure your answer is absolutely correct. But unfortunately I belong to the crowd, to whom the answer is like hieroglyphics. If I already have known the electricity-law (Ohm's law ?) My asking to you was superfluous. If you try to ask and at the same time give your electric-formula, to any women, you like, in any age and education, the next 10 years. You mabye end up that 1% or 2% know what you're talking about and are able to use the formula. Since I never have understand the principle of electric, I have many times, through the years, ask colleagues, neighbours and acquaintance : will it function if I do so (electricity), can I change this two and connect those instead of etc. And my experiences tells me, that lower than 50% of all men, no matter of age or any education, have no clue. Under condition I'm not a joker - your answer will reach less than 25% of all people in this world. Ergo more than 75% have no help from the answer. And I think it was not yout intention. If you don't feel I've been unfair. Would it be possible to answer yes or no (roughly yes or no), to my question about HP will change if a motor is in 110 V respective 220 V (same watts) ? My regards to you. It's respectful when people learn their lesson in schooldays and craftsmen without academic aptitude, can communicate. Quote
Kohlrausch Posted August 6, 2015 Report Posted August 6, 2015 Would it be possible to answer yes or no (roughly yes or no), to my question about HP will change if a motor is in 110 V respective 220 V (same watts) ? Hi, same Watts means same Horsepower. If you change the Volts and want to keep the Watts (and Horsepower) you have to change the Amperes accordingly. Greets Ralf C. Quote
Members Constabulary Posted August 6, 2015 Members Report Posted August 6, 2015 Hey Kohlrausch - just noticed your from Hannover (Lowersaxony) - thats approx.100km south of me. I´m about in the middle of BREMEN + HANNOVER Welcome to the jungle! Quote ~ Keep "OLD CAST IRON" alive - it´s worth it ~ Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2
Kohlrausch Posted August 6, 2015 Report Posted August 6, 2015 THX. Learned a lot from your posts - and like the pic. Rather rare for a Kraut to operate a 111. Greets Ralf C. Quote
Moderator Art Posted August 7, 2015 Moderator Report Posted August 7, 2015 northmount Your calculation - watts to HP - will it be the same, whenever we taking about 110 or 220 voltage ? I have an old Singer motor (on a heavy 45K25). Is it possible that these motors is constructed to be weird as 3-phase alternative 1-phase? Three phase alternative one phase would be indeed be weird. Because of the way single phase motors work you need to have starting and often run capacitors for them to actually go in the proper direction on startup and then to stay running with a load on them. Three phase motors don't require any of that except in uber technical situations. Being as you don't have an electrical clue, going through the necessity for the current to lead or lag just wouldn't make sense and would glaze your eyes over. HP is HP no matter the voltage. You can't run a 120 volt motor on 220V, at least not for very long. Northmount's explanation was correct (to us) but was not a course in AC electricity. What he said is that you have a 1/2 horse motor that runs on 120V single phase. Occasionally there is a switch or wiring ability for 220V, but yours is not so equipped. Art N3CAF Quote For heaven's sakes pilgrim, make yourself a strop!
Northmount Posted August 7, 2015 Report Posted August 7, 2015 You can read the amps (current) and the volts from the motor nameplate. As above, you can determine Watts from that. and 746 Watts = 1 hp. For an older motor, use a power factor of 0,6. Newer, use 0.75. The motor nameplate will also tell you if it is 3 phase. If no mention of 3 phase, it is single phase. So all you need to do to compare motors and their wattage or hp, it's a simple substitution of the values into the formulas. That is something like grade 6 or 7 math. You asked a specfic question and I answered with the specifics. I ihave no way of knowing your level of understanding of math or electricity. Tom Hope this helps with the comparisons you are trying to do and understand. Quote
Trox Posted August 8, 2015 Report Posted August 8, 2015 Anyway, that motor won't sell for 25 USD. If he paid 400 dollars for that motor then he should complain to the police, it's a robbery! Only good thing is that's a four pole motor, they are easier to control and can rotate both ways. However, it's add no value to the machine, you most likely will give it away and install a servo motor. Tor Quote Tor Workshop machines: TSC 441 clone/Efka DC1550, Dürkopp-Adler 267-373/Efka DC1600, Pfaff 345-H3/Cobra 600W, Singer 29K-72, Sandt 8 Ton clicking machine, Alpha SM skiving unit, Fortuna 620 band knife splitting machine. Old Irons: Adler 5-27, Adler 30-15, Singer 236W-100
Members MFloyd Posted June 1, 2023 Members Report Posted June 1, 2023 Gentlemen, I also have a Problem with my Singer 211G155.... I would like to slow it down a bit. I was wanting to replace the 4in. pully with a 2in. pully....Problem, I don't have a clue where to find a 2" pully. Could any of you guide me to a place that I could acquire one. Thanks a lot.... MFloyd Quote
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