A new range of ultra-compact high-torque gearboxes and servomotor driven rotary positioning actuators, based upon SPINEA’s TwinSpin ‘bearing reducer’ technology has been launched by motion control specialists Heason Technology. The TS50 gearbox and DS50 servo actuator are both packaged in nominal 50 mm square housings and, complete with heavy duty radial/axial output bearings, feature an 18Nm rated torque output with a five times overload capacity for short term emergency conditions. With smooth backlash-free performance suited to high precision/heavy load positioning, the new miniature gearbox and actuator will satisfy demanding space restricted and high torque applications across robotics and automation.
The TwinSpin uses a patented trochoidal gear reduction principle, based on two eccentrically rotating planetary gears that mesh via precision needle rollers in an outer gear ring. The input shaft rotates the eccentric action of the planetary gearing, causing the outer ring to rotate in the same direction. With almost 50% simultaneous gear meshing and with the input to output reduction determined by the ratio between planetary and ring gear teeth, the TwinSpin is able to efficiently transmit very high torque with backlash-free performance.
In addition, due to such a high contact surface area and an integrally robust power transmission and bearing system, the TwinSpin bearing reducer can withstand up to five times overload torque under emergency stall conditions. Furthermore, the design boasts a very low input inertia and friction rating allowing a fast servo system response with noise and vibration levels that are also suited to sensitive hi resolution positioning.
For the new miniature TS50 gearbox, a standard internal 6 mm diameter shaft with a keyway slot provides the input interface and the output is handled by a flange opposite to the mounting face.
With a fixed 63:1 reduction ratio and overall length within 41 mm, it is possible to offer a variety of different input to output mechanical configurations and alternate internal bearing systems to suit increased load handling, reduced friction, larger ambient temperature range and improved precision versions. The protection class for the standard product is IP64.
When built into the DS50 compact servo actuator, the gearbox is mounted to high performance AC servomotor with integral resolver feedback. The mechanical interface from the output shaft to the customers load may be customised to suit requirements. Brake options are available and motors may be fitted with flying lead or connectors.
Alternative position feedback options including external load mounted rotary or linear encoder systems are available from Heason Technology who is also able to provide a wide range of drives and motion controls to complete the application.