It offers variable speed from 1000 to 4000rpm and offer 18% more efficiency and reduce 28% more weight compared with conventional motor. Ideal parts for compressors, vacuum pumps, oxygen concentrator, medical device. Unique geometry motor allows the rotor to be mounted directly to the air bearing shaft, eliminating the use of ball bearing. Without iron core, eddy current losses are eliminated. Unaffected by temperature or water. Specification Peak torque: 3.18Nm Peak current: 60A Shaft power: 452W Voltage: 48Vdc No load speed: 4020 rpm No load voltage: 24 V Terminal resistance: 0.31ohms Stator inductance: 20 microH Electrical time constant: 0.065ms Max rotor temperature: 70℃ Max Stator temperature: 110℃ Diameter: 49mm-52mm Total motor weight: 595g