VARS0022 Micro Size Rotary Voice Coil Motor High Stability 0.22Nm 32deg Actuator

Product Overview

The VARS0022-032-00A is a compact swing-type rotary voice coil motor introduced by SUPT MOTION, designed specifically for precise angular positioning in confined spaces. At 25 °C, this rotary voice coil motor delivers a peak torque of 0.22 N·m and a continuous torque of 0.12 N·m over a total travel range of 32 degrees, with a maximum drive voltage of 15.5 V.
Measuring just 60 × 60 × 36 mm and with a moving coil weighing only 21.5 grams, this motor is currently one of the lightest angle-limited rotary actuators available for instrument-grade applications. Thanks to its direct-drive design, the rotor responds instantly to current commands and is free from the backlash issues common in geared motors.
Since torque increases linearly with current and there is no brush wear, this voice-coil actuator provides smooth, repeatable motion throughout its rated service life of 10,000 hours. The aluminum alloy housing offers excellent heat dissipation and protects the coil and magnet assemblies in both industrial and laboratory environments.

Solution

Designers of compact instruments often require a rotary platform that is small enough to be mounted next to optical components or sensors, yet stable enough to maintain its angle during measurements. Micro-stepper motors not only add weight but also consume continuous holding current and generate cogging ripple that interferes with sensitive payloads.
The VARS0022-032-00A offers an alternative: a built-in, highly stable microactuator. The coil is driven directly within the magnetic field, so the motor has zero backlash and zero holding torque; the low moving mass ensures a sufficiently high mechanical resonance frequency, enabling a fast and well-damped steady-state response. Holding torque is provided electromagnetically and requires only a moderate continuous current to maintain, enabling the system to achieve rigid angular locking without the need for mechanical braking.
This solution enables engineers to build a highly stable angular positioning loop using only three components: the actuator, a current amplifier, and an angle sensor. The predictable torque constant simplifies the tuning process, and as projects scale up, the same control code can be reused across different sizes of VARS racks. The result is a compact, quiet, and maintenance-free motion axis capable of meeting the precision expectations of modern optical and test equipment.

Specifications

Application

This micro size rotary voice coil motor fits applications where board space is measured in millimeters: optical filter wheels, miniature gimbal stabilizers, autofocus assist mechanisms, print-head adjusters and compact valve positioners. It is also used in semiconductor handling tools, laboratory automation and medical instruments that require a small, clean angular stage with high stability.
The 32-degree travel covers the sweep needed by most sensor alignment and switching mechanisms, while the light coil enables gentle, oscillation-free moves that do not shake neighboring components. In rotary valve and damping applications the motor provides smooth torque modulation, and in rotary positioning systems it acts as a precise limited-angle indexer. For customers who need a different footprint, SUPT MOTION offers the same swing-type voice coil technology in frame sizes from miniature to high-torque industrial classes.

FAQ

Q1: How compact is the VARS0022-032-00A?

The outer frame measures 60 × 60 × 36 mm and the moving coil weighs only 21.5 g, which makes it suitable for installation inside handheld instruments, optical modules and compact automation assemblies.

Q2: What makes this motor stable at a fixed angle?

High stability comes from the direct-drive voice coil design: torque is proportional to current, there is no friction or backlash in the drive path, and the low-inertia coil allows the servo loop to hold the commanded angle firmly without limit cycles or drift.

Q3: Can the motor oscillate continuously?

Yes. Within the continuous torque rating of 0.12 N·m at 25 °C the actuator can run in continuous bidirectional oscillation for scanning, dithering or pumping duties, with no brush wear to limit its lifetime.

Q4: Which feedback device should be used?

An optical encoder, magnetic encoder or capacitive sensor can be mounted on the output shaft depending on the resolution needed. The actuator itself behaves as a clean linear plant, so most standard servo tuning methods apply.

Q5: Is customization available for this model?

Yes. Stroke angle, drive voltage, coil termination, shaft details and mounting holes can be adapted for OEM programs. The minimum order is 1 piece and samples are typically shipped within 3-5 working days.