Micro Stepper Driver Package Offers Many Functions

The RBK two-phase, bipolar stepping motor and drive package featuring dc input provides a number of special control functions such as the smooth-drive function that enables low-vibration operation with the flick of a switch. This function divides the basic 1.8° step angle up to 128 microsteps (0.018° step angle) in 16 selectable resolutions via switches on the driver. A third harmonic suppression function reduces step motor torque vibrations by correcting or shaping the driver current waveforms, especially at lower shaft speeds. Another unique function suppresses the vibration signal levels in the mid-speed range. The system employs a constant-current drive strategy over a voltage range from 20 to 75 Vdc and effective current reaches 6.3A peak (4.5A RMS) per phase. It offers two motor-frame sizes with three models of each. The models RBK264A, 266A, and 268A measure 2.22” in diameter (size 23) with holding torques ranging from 68 to 240 oz.-in. The 3.35” (size 34) models RBK296, 299, and 2913 develop holding torques from 310 to 910 oz.-in. Otherwise similar, a second version of the RBK series is available with an IP65 rating. ORIENTAL MOTOR USA CORP., Torrance, CA. (800) 418-7903.