Worm gear motor with mechanical speed control

Based on our many years of experience in drive technology, we are the ideal partner when it comes to using worm gear motors with mechanical speed control via a handwheel. Top quality, a competent team, and a competitive price are our priorities. If you cannot find the right drive for your application, please send us your inquiry by email or simply contact us directly by phone.

Performance indicators

The handwheel-controlled worm gear unit is made of an aluminum or cast iron housing and is available in sizes 40, 50, 63, 75, 90, 110, and 130. The combination of worm gear, variable speed drive, and three-phase motor is available with power ratings from 0.18 kW, 0.25 kW, 0.37 kW, 0.55 kW, 0.75 kW, 1.1 kW, 1.5 kW, 2.2 kW, and up to 3.0 kW. The speed-controlled worm gear units are available with hollow shafts in the following sizes: 14 mm, 18 mm, 25 mm, 28 mm, 35 mm, 42 mm, and 45 mm. The speed-controlled worm gear motor can be used in mounting positions M1, M2, and M4. As with any drive of this type, it is essential to ensure that the speed control is only performed during operation.

Examples of use

SEVA-tec variable displacement geared screw motors are widely used, for example in or on shredders, agitators, presses, feed screws, pipe screws, metering screws, grain crushers, belt conveyors, chain conveyors, reflectors, conveyor spirals, belt dryers, feed silos, washing systems, packaging machines, sawmills, in conveyor technology, the food industry and generally in plant and machine construction.

Functioning of the adjustment gear

The variable-ratio gearbox is a planetary gearbox with an adjustable reduction ratio. The motor drives the sun gear. The rotary motion is transmitted to the planet gears. The connection between the stationary and moving outer races transmits the rotary motion to the output shaft. The axial position of the moving race and the radial position of the planet gears change due to the displacement of the ball ring and cam. This alters the roller diameter and the angular velocity of the output shaft. If the contact point between the planet gears and the outer race shifts towards the center of the planet gears, the output speed decreases and the torque increases.

Be careful when controlling the speed

The speed may only be adjusted when the adjustment mechanism is in operation and not when it is stationary.
Otherwise, the adjustment mechanism will be damaged.

Worm gear motor buying guide

Professional support is essential when purchasing a SEVA-tec worm gear motor with handwheel speed control. We would particularly like to highlight our telephone consultation and assistance with product selection. Furthermore, thanks to our large stock of worm gears, we offer short delivery times.