The MVz (MV3) series Wave Gear Motor-Reducers, manufactured by PTC Privod (Penza, Russia), are compact drive units combining a harmonic (wave) gearbox with an AC motor in a single housing. The harmonic drive principle — patented by Walton Musser in 1959 — achieves speed reduction through elastic deformation of a flex spline engaging a rigid ring gear at two simultaneous contact zones.
This gives the MVz series its defining advantages over conventional gearboxes: exceptionally smooth output motion, zero backlash, and high kinematic accuracy. Two frame sizes cover a wide performance envelope: the MVz-80 delivers output speeds of 7.1–56 rpm with nominal output torque up to 180 Nm and a permissible radial overhung load of 3,400 N (motor power 0.25–0.37 kW, unit mass approx.
12 kg); the MVz-160 covers 6.3–35.5 rpm with output torque up to 1,250 Nm and radial load capacity of 9,000 N (motor power 1.1–2.2 kW, unit mass approx. 60 kg).
Both variants are available in flanged or foot-mounted configurations and can be installed horizontally or vertically (output shaft down). Supply voltage 220/380 V, 50/60 Hz.
Rated for continuous duty with bidirectional rotation, dust concentration up to 10 mg/m³, altitude to 1,000 m, and ambient temperatures from −45 °C to +40 °C (temperate climate class).
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