Combined motor and ballscrew succeeds with precision
Motor driven ballscrew actuators are widely used in applications as varied as special purpose machines and extending jetways at airports
Problem: . The only complaint one hears is that they require separate motors, drive trains and actuators, and so are not generally regarded as very low cost.
Solution: DRL actuators from Oriental Motor combine the functions of stepper motor and ballscrew into a single unit. The motors have a hollow rotor that extends beyond the envelope of the stator, creating an enclosure for the ballscrew. The extended rotor, encompassing the ballscrew, is supported within the actuator's body by a pair of large bore bearings. When the motor is energised, the rotor and enclosed ballscrew rotate, causing the ground, threaded shaft to move in or out of the actuator body.
The use of a five phase motor with a 0.72 deg step angle, in combination with a ballscew, results in extremely accurate positioning figures over the unit's effective stroke length. The series if available in three standard frame sizes, 28, 42 and 60mm. Two types of actuator are available, a standard version and one with a guide. In addition, users are also offered an electromagnetic brake and/or adjusting knob. To complement the actuators, users can specify a mounting plate and a bespoke driver.
Applications: Applications envisaged by the company include: precision X-Y stages, microscope automation, semi conductor manufacture, medical dosing equipment, optical measurement systems and electronic manufacture.
The DRL series is the first example of a larger range of linear systems that will soon be available in the UK from Oriental Motor, expanding on the company's existing motor and fan ranges. TS
Mark Checkley at Oriental Motor
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