What is RevelHMI Technology?

Optimize [verb]: to make as effective, perfect, or useful as possible.

RevelHMI technology is an integrated vibration solution that enables better devices. 

RevelHMI’s integrated technology provides new levels of vibration performance that were previously thought to be only hypothetical. Designed with the next generation of consumer products in mind, RevelHMI motors are easily optimized for any application that requires motive actuation, buzzer notification or HD haptic feedback. 

RevelHMI is an improved version of resonating motor technology

RevelHMI motors are based on resonating motor technology, with several important improvements that increase performance and make it easier to implement.

A key feature of resonating motors is that they tend to have a single resonant frequency where they generate significant vibration power. Unfortunately, resonating motors tend to lack vibration power at non-resonant frequencies. RevelHMI has developed a series of improvements which remove the single speed constraint, improve performance and make our technology less expensive and risky to use. The end result is a vibration technology with unbeatable power, efficiency and reliability.

The complexity of the physics involved with resonating motors makes them difficult to understand, model and develop. RevelHMI has removed this complexity with a series of standardized components which enable rapid development of solutions which meet exact performance targets that are not possible to meet with any other solution.

RevelHMI is the only integrated vibration solution.

RevelHMI is the only vendor that offers an integrated vibration solution consisting of actuators, drive coils, driver circuit and software. Other solutions require product designers to cobble to together systems based on components from a variety of different vendors, which requires expensive and risky integration efforts.

RevelHMI Resonating Actuators 

RevelHMI offers a variety of low-cost actuators that can be configured to provide vibration functionality and performance that is not possible with other technologies. Our actuators are capable of providing internal, focused and external action to support a wide variety of requirements. RevelHMI actuators enable new features and better performing products while removing many of the constraints that are caused by existing technologies.

Our internal actuators enable smaller products with rapid start and stop times, precision power/amplitude performance and axis-control to enable HD Haptic functionality. We can also enable high-amplitude, low-frequency actuators for game controllers and other applications. 

Our external actuators are scalable from powering very small vibrating features on a device to powering large external actuators which performs mechanical work. This allows designers to design products where vibration is focused on a single point to transmit haptic meaning or to develop battery-powered devices which perform mechanical work that was previously only possible with plug-in devices.

RevelHMI actuators are typically very simple, consisting of a spring and a magnet, which also makes them very inexpensive. They are extremely quiet, reliable and provide very consistent performance over their long life. Because they are more efficient, they require less battery capacity; this coupled with their small size enables much smaller devices with better performance.

RevelHMI Drive Coils

To enable performance scaling, smaller devices and lower costs, RevelHMI technology separates the drive coil from the actuator. Separating these components allows us to scale, optimize and meet specific performance requirements.

We use a variety of electromagnetic technologies from e-coils, wound copper coils, thin film-based coils and more for the specific application.

RevelHMI Integrated Driver

RevelHMI motors use a high-performance driver system to optimize for the frequency, power and efficiency requirements for a specific application while enabling easy API control of the system. RevelHMI drivers also integrate other motor control, sensor and passive components to create a complete control system.

RevelHMI's motor architecture adds design flexibility and cost savings. RevelHMI software can run on an existing microprocessor, a discrete microprocessor or on a dedicated ASIC or FPGA depending on capability and requirements of the device. RevelHMI drivers are also capable driving multiple actuators to enable significantly improved device functionality and performance.

RevelHMI Breaks Performance Barriers

There have been few innovations or performance gains in vibration technology, but demand for increased vibration performance has grown rapidly due to the large number of devices and applications that use vibration, including game controllers and emerging applications like HD Haptics.

Most products that feature vibration use ERM actuators, which were invented in the late 19th century, and more recently LRA-based actuators. These actuators cannot meet levels of performance demanded by device manufacturers. This has resulted in larger devices and compromises in device design and functional performance. The image below illustrates that existing technologies have relatively similar and small performance envelopes compared to what is possible or what is needed. 

Existing motors have a much smaller performance envelope than new products demand.

Existing motors have a much smaller performance envelope than new products demand.

In response to a lack of options, some companies have developed proprietary solutions, such as Apple® and its Taptic® motor, to meet the demand for higher vibration performance. These efforts are risky and expensive and beyond the capability of most device manufacturers.

RevelHMI motors are capable of a significantly higher vibration performance than other solution. We can beat other solutions in terms of vibration power, range of vibration, motor efficiency and size. As an example, one version of our motor has the following performance compared to two leading actuators designed for mobile phone applications.


Testing Using TI DRV2605 Haptic Evaluation Board
ERM is Sanyo/BRS-2575 & no chip
LRA is AAC/ELU 1036 & TI chip
RevelHMI proto, using RevelHMI driver circuit.

Apple® and Taptic® Motor are trademarks of Apple Inc.