I have measured some properties of four sewing machine motors for domestic use. They are all universal motors (series motors) for the public grid voltage in Europe. The four motors are: a) Singer 66K motor. Motor seems to be produced about 1930 in UK. b) Singer 201K motor. Motor seems to be produced about 1950 in UK. c) Sytrix BF40 motor. Made about 1970 in Denmark. Used on a Singer 237. d) Chinese 180W motor made 2013. http://www.ebay.co.uk/itm/121137592820 The shaft power measurements are made by connecting the motor to a 6 mm diameter shaft, which also are a winch lifting weights from floor to ceiling. The weight passes some marks on a ruler on its way up. The winch thread diameter is 0.5 mm. A small video camera was used to record the lifting, and by a study of the video frames, the speed and power is calculated. A normal kitchen scale is used to measure the mass of the different used weights. The applied voltage is approx. 230 VAC, 50 Hz. https://dl.dropboxusercontent.com/u/10237290/tabel%20for%20motorer.jpg [Broken] I have the following comments: The Singer 66K and Sytrix motors have expected performance. The Singer 201K motor seems to have an error in the design or a systematic production fault. Lower DC resistance and higher shaft power can be expected from a motor of this voltage and weight. The unexpected high DC resistance is both on stator and rotor windings. The Chinese motor becomes uncomfortably hot when used in a few minutes. The design seems to have focus on using as little steel and copper as possible. The missing label and EMI filter makes it illegal to sell in most countries. I bought this motor 3 weeks ago, and knew that I could buy some performance issues – it was inexpensive and the nominal power was high. Perhaps I should have asked for the weight of the motor beforehand, because it could give a clue on what to expect. What is to be expected, when you buy a domestic electric motor with a specified nominal power rating? How can you determine, that such a motor is more a heating element than a motor? On industrial AC motors, the norm specifies to write shaft power on the label. What can be expected from domestic electric motors?