Mechanical Dimensions INTEGRATED STEPPER MOTOR+DRIVER HI42 series Feature Picture .. Integral Design, all in one (controller, driver and motor) .. Frame NEMA17 .. hybrid bipolar stepping motors .. Different Rated Current .. Holding Torque for your separate applications Specification Series Model Step angle (°) Motor Length (mm) Rated Current (A) Phase Resistanc e (Ù) Phase Inductance (mH) Holding Torque (Kg.cm Min) Rotor Inertia (g.cm²) Lead Wire (NO.) Motor Weight (g) HI42-a 1.8 34 1 2.15 2.4 2.2 34 4 220 HI42-b 1.8 48 1.7 1.8 2.8 4.5 68 4 360 HI42-c 1.8 60 2.1 1.6 3 5.8 82 4 450 Note : The above motor information is only for your information. The more motor information is showed in our stepper motor catalogue. HI42-a stepper motor could use CI240-2A stepper motor driver for building up an integrated stepper motor HI42-b stepper motor could use CI240-2A or CI240-4A stepper motor driver for an integrated stepper motor HI42-c stepper motor is corresponding to a CI240-4A stepper motor driver You have to consider at least two parameters of a stepper motor to choose the right UIM stepper motor driver for an integrated stepper motor: the Rated Current and the Torque CI240-2A adopt 10-35 DC power supply and supply 0-2 amps settable output current. CI240-4A adopt 12-35 DC power supply and supply 1.5-4 amps adjustable output current. The UIM24004 performs much better than CI240-2A, the temperature of CI240-4A after a 8 hours continuous working is about 50 degree Celsius and the CI240-2A could reach about 60 degree Celsius which is among their working environment. The working condition influence a bit on the temperature of the stepper motor driver: if there is a big metal module on your machine for mounting the stepper motor or working with pause, the temperature of the integrated stepper motor will go down. Besides this Parallel port stepper driver, you could also use CI241 Serial port with RS232 interface and CI242 CAN Bus networking stepper controllers to build up an integrated stepper motor