Use this permanent magnet motor with Type K DC rectified power sources matched to voltage (providing form factor does not exceed 1.3). Item: DC Permanent Magnet Motor Motor Application: Variable Speed Motor Design: DC Permanent Magnet HP: 1/4, 1/7 Motor Enclosure Design: Totally Enclosed Nonventilated Nameplate RPM: 1750/3900 Voltage: 12/24VDC Full Load Amps: 14.0 Full Load Torque: 5.63 in.-lb. Frame: Non-Standard Motor Mounting Type: Face/Base Motor Thermal Protection: None Ins. Class: B Bearings: Ball Max. Ambient Temp.: 40 Degrees C Rotation: CW/CCW Overall Length: 8-3/8" Length Less Shaft: 6-7/8" Shaft Dia.: 1/2" Shaft Length: 1-1/2" Base Mounting O.C.: 6-7/16 x 2" Face Mounting O.C.: 2-5/8 x 2-5/8 Brush Type: External RPM Range: 1701-1800 Standards: UL Recognized (E61772)