VARS4520 Rotary Voice Coil Motor 45.2Nm High Torque Fast Response Zero Backlash

Product Overview

The VARS4520-030-00A is the high-torque flagship product in SUPT MOTION’s VARS series of rotary voice coil motors. At 25 °C, this rotary voice coil motor delivers a peak torque of 45.2 N·m and a continuous torque of 19 N·m over a total stroke range of 30 degrees, with a maximum drive voltage of 71.5 V. This industrial-grade swing actuator is specifically designed for heavy-duty, angle-limited positioning applications that require high acceleration and zero backlash.
With a diameter of 240 mm and a height of 78 mm, this rotary voice coil motor features a high-energy magnetic circuit design that directly converts drive current into rotational torque without the need for gears, belts, or brushes. Its direct-drive architecture enables instantaneous response, high-frequency performance, and maintenance-free operation with a service life of up to 10,000 hours.
The VARS series typically offers a travel angle exceeding 100 degrees and torque up to 50 N·m, meeting the demands of a wide range of demanding industrial and aerospace applications.

Solution

Traditionally, heavy-duty rotary positioning tasks have relied on hydraulic actuators, large stepper motors, or servo motors equipped with high-ratio gearboxes. These solutions suffer from issues such as the risk of oil leaks, backlash, flexibility, high maintenance costs, and slow response times.
The VARS4520-030-00A offers a clean, electrically driven direct-drive alternative with a peak torque of 45.2 N·m. Since no gearbox is required, this rotary voice coil motor features zero backlash and zero cogging effects, meaning positioning accuracy is determined solely by the feedback system. The high torque-to-mass ratio enables high acceleration, supporting rapid indexing and dynamic load handling, while the linear current-torque characteristic simplifies control and improves repeatability.
The actuator operates quietly, requires no lubrication, and eliminates downtime caused by wear on transmission components. For applications requiring high force density in compact spaces—such as flight control surfaces, heavy-duty valve actuators, and industrial indexing—this motor provides a reliable and precise solution. It can be configured with an encoder, rotary transformer, or limit switches to meet the safety and precision requirements of various installation environments.

Specifications

Application

The VARS4520-030-00A is applied in heavy duty rotary positioning systems, flight control actuators, large rotary valve and damping actuators, antenna positioning mechanisms and industrial indexing tables. Its markets include aerospace, automotive, semiconductor and industrial automation. The motor is also suitable for dynamic load simulation, motion platforms and large mirror positioning in laser systems. With torques up to 50 N-m available in the series, SUPT MOTION can match the actuator to the exact force and stroke requirements of each project. Custom voltages, feedback options and mounting interfaces are available for OEM programs.

FAQ      

Q1: What is the maximum torque of the VARS series?

The VARS series covers peak torques from 0.08 N-m to 45.2 N-m, with the VARS4520-030-00A being the highest torque standard model. Series torque reaches up to 50 N-m.

Q2: Does this actuator require a gearbox or hydraulic power unit?

No. It is a direct drive electric actuator. No gearbox, hydraulic unit or lubrication system is needed, which eliminates backlash and reduces maintenance.

Q3: What stroke angles are available?

Standard strokes range from 6 to 100 degrees depending on the model. The VARS4520-030-00A provides a 30 degree total stroke, and custom stroke angles can be engineered.

Q4: How is the motor controlled?

A servo driver or current amplifier providing up to 71.5 V supplies the motor. Closed-loop control with an encoder, resolver or Hall sensor is recommended for positioning applications.

Q5: What industries use this high torque actuator?

It is widely used in aerospace flight control, industrial automation, semiconductor equipment, automotive test systems and heavy valve actuation.