Phase Adjusters
Actuators require high-precision gears with zero backlash and high ratios with trim adjustment to facilitate reliable equipment and performance. At Harmonic Drive, we specialize in innovating, designing and producing high-quality phasing differential gears that can fine-tune phase and timing during equipment operation.
Phasing Differential Gears Back to top
Our engineering and development teams focus on building high-precision, quiet phase shifters for demanding use cases in the space and manufacturing industries. We design these components to deliver:
- Positional accuracy: This element ensures the smooth transition of power for optimal functionality.
- Zero backlash: Using our differential gears in your equipment ensures zero movement loss, delivering precise position and timing.
- High-torque-to-weight ratio: We prioritize this attribute to build high-performing phase adjusters
- Compact size: Our compact gears save space while delivering significant precision and the required torque capacity.

FD Series - FD-2
The FD series is an ultra-compact pancake-style phasing differential gear unit. Your team can easily install it into equipment, and it requires no assembly adjustment. Adjusting the shaft requires minimal torque.
We have the FD-2 component type without housing.

FD Series - FD-0
This series consists of the FD-0 unit type with housing, allowing the mounting of other components onto it.

FBB Series
The FBB series is a versatile differential drive transmission that allows the direct phasing of rotating elements. This axially compact, single-stage, high-ratio gearing is ideal for machines with position adjustment or optional speed. The component doesn't come with housing for mounting other parts.
Infinit Indexer® Back to top
The HDI Infinit Indexer phase adjuster is a configurable unit that can meet various design needs via precise shaft phase adjustment.

HDI Infinit Indexer® Series
This comes in six sizes with torque ranging from 500 in-lb to 20,000 in-lb. The product also features shaft phasing coupling for precise rotary positioning and a 100:1 adjustment ratio to enable multi-functionality, as you can change the relationship between shafts.
Why Consider Harmonic Drive for Precision Phase Shifters?
Since inventing the strain wave gear in 1955, we have considerably advanced our gearing technology to compact, high-precision quality. Our development and engineering professionals work hard to innovate and build durable, reliable, high-speed phasing differential gears for demanding applications.
Our manufacturing process, from ideation to production, takes place in-house, allowing us to adhere to a set of strict and consistent quality standards. We also have ISO 9001:2015 and AS9100 certifications because we are committed to complying with industry standards.
Other reasons to partner with us include:
- Access to custom solutions that suit your OEM equipment specifications
- Expert support in helping you identify the correct phase adjuster for your application
- Peace of mind knowing you're collaborating with a reputable company
Source Phase Adjusters From a Manufacturer You Can Trust
Consider Harmonic Drive for high-precision phase adjusters for your equipment. Our extensive experience and dedication to high performance empower us to innovate and build phasing differential gears you can trust. They'll provide the rotational power for your equipment to function at varying speeds.
Contact us to get a quote or discuss your desired phase adjuster.