The range of integral linear actuators developed by Phase Motion Control for various linear positioning applications, and specifically to ease the replacement of hydraulic cylinders in plastic injection molding machines, delivers a complete functionality packaged in a single engineered unit.

The actuator consists of: A high performance, rare earth PM servo motor derived from the Ultract range, with a hollow shaft, which can take the fully retracted lead screw; A special front end with a high axial load bearing system (oblique contact ball bearing fin small units, barrel type conical roller bearings in the larger units) which houses the rotary nut of the lead screw, and which is driven by the motor part; In the back of the actuator, a multiturn absolute encoder which is used for electronic control of the electric piston across the stroke.

The actuators thus realized are endowed with exceptional stiffness and accuracy, travel speed up to 1 m/sec, can be controlled both in thrust and position, with repeatability better than 1/100 mm. All issues of screw lubrication, assembly, alignment, as well as the related drive train, are optimized and designed inside the unit.