The AmpFlow A23-150 motor is designed to deliver the highest performance and efficiency possible from a brushed DC motor of this size. This is achieved by the use of rare-earth neodymium magnets, along with four brushes, and advanced electromagnetic computer modeling and design. This reversible motor can be used at voltages ranging from 12V to 36V (the RPM is proportional to the voltage. ) At 24 Volts, it has a no-load speed of 6400 RPM. Peak short-term power output is 670 Watts (0. 9 horsepower). Peak efficiency of 82% is reached while drawing 10 Amps at 5900 RPM. The power output at 10 Amps is 200 Watts (0. 26 horsepower). These motors are made from two sturdy aluminum castings and a seamless body. The A23-150 motor is 2. 3 inches in diameter and 3. 5 inches long. The 3/8-inch diameter shaft is one inch long, and it rides in two high-quality ball bearings. The motor weighs 2. 1 pounds, and it is finished in a high-quality black powder-coat paint. AmpFlow® motors are used in diverse applications, including robots, industrial motion control, factory automation, semiconductor manufacturing, power tools, pumps, and personal transport systems. Search for "AmpFlow motors" for more choices.