VARS0120 Rotary Voice Coil Motor High Acceleration Zero Backlash 1.2Nm

Product Overview

The VARS0120-020-00A rotary voice coil motor is a high-acceleration oscillating actuator in the SUPT MOTION VARS series. At 25 °C, this actuator delivers a peak torque of 1.2 N·m and a continuous torque of 0.5 N·m over a total stroke range of 20 degrees, with a maximum drive voltage of 8.4 V.
The voice coil weighs only 65 g, and the motor housing measures 81 × 73.4 × 32 mm. The combination of high torque and low moving mass produces excellent angular acceleration, enabling the actuator to reach the commanded position within a few milliseconds. The direct-drive voice coil design eliminates gears and transmission components, resulting in zero backlash, zero cogging effects, and smooth bidirectional motion at high frequencies.
This rotary voice coil motor is specifically designed for applications requiring aggressive point-to-point motion, rapid stabilization, and high repeatability, such as pick-and-place mechanisms, shutter drives, and dynamic test equipment. The VARS0120-020-00A features an aluminum alloy construction, a rated service life of 10,000 hours, and is maintenance-free, delivering servo-grade dynamic performance to compact motion systems.

Solution

High-speed automation requires actuators capable of rapid acceleration, quick stabilization, and precise repeatability without mechanical error. Traditional motor-gearbox couplings introduce inertia, backlash, and compliance, all of which degrade dynamic performance. The VARS0120-020-00A addresses this issue by utilizing a direct-drive rotary voice coil motor that generates torque directly from a low-mass coil.
Its high acceleration capability shortens cycle times for pick-and-place and sorting equipment, while the zero-backlash design ensures precise stopping at the commanded angle with every movement. Since the motor has no cogging torque, motion remains exceptionally smooth even at extremely low speeds, thereby improving positioning stability in precision mechanisms.
The linear relationship between current and torque simplifies control software: standard servo drives or simple current amplifiers can drive the motor in force, speed, or position modes. Compared to traditional rotary servo systems, this reduces engineering effort and minimizes the number of components. The rugged aluminum frame and sealed coil assembly also make this actuator suitable for industrial environments with dust and vibration.

Specifications

Application

The high acceleration characteristic suits automated assembly, semiconductor handling, test and inspection equipment, and other applications where short cycle time is critical. Typical uses include rotary index mechanisms, shutter and gate drives, sorting chutes, dynamic load simulation, valve actuation and flight control systems. The actuator also performs well in high frequency scanning and dithering tasks where fast bidirectional motion is required. Markets include semiconductor, automotive, industrial automation and aerospace. Custom stroke, voltage and mounting configurations can be provided for OEM integration.

FAQ

Q1: How fast can this motor accelerate?

The low moving coil mass of 65 g combined with 1.2 N-m peak torque provides very high angular acceleration. Typical step-and-settle times are in the millisecond range, depending on load inertia and driver settings.

Q2: What is the total stroke of the VARS0120-020-00A?

The standard total stroke is 20 degrees. Stroke values from 6 to 100 degrees are available across the VARS series.

Q3: Can the motor be used for continuous oscillation?

Yes. The direct drive design supports high frequency bidirectional oscillation within the continuous torque rating, which is suitable for scanning and dithering applications.

Q4: Which driver is recommended?

A PWM servo driver or linear current amplifier rated for 8.4 V and the required peak current is recommended. SUPT MOTION can advise on driver selection for your application.

Q5: Is this motor suitable for industrial environments?

Yes. The aluminum alloy frame and robust construction are designed for industrial automation, and the motor requires no maintenance under normal operating conditions.