Haptic Technology 101: A Beginner’s Guide to the Different Types of Vibration Motors
Haptic feedback has become an integral part of our daily lives, often without us even realizing it. The term "haptic" comes from the Greek word "haptikos", which pertains to our sense of touch. Haptic technology uses our sense of touch to communicate by applying forces, vibrations, or motions, further enhancing the immersion into the digital world. Nowadays, the most common haptics use case is in smartphones—your phone vibrating whenever you get a call or text message—but it is also used in gaming, virtual reality, automotive, accessibility, and medical applications.
In order to create haptic effects, there's one crucial piece of technology needed: the haptic motor. Below, we've put together a beginner's guide to understanding the most popular types of haptic motors in the market.
1. Eccentric Rotating Mass (ERMs)
An Eccentric Rotating Mass (ERM) is a rotating electric motor with an off-center mass. As the ERM rotates, the mass becomes displaced, creating the 'rumble'or vibration feeling.
For many years, ERMs have been the most popular type of haptic motor due to their low cost, simplicity, and effectiveness. However, their vibrations lack precision and they can be slow to start and stop, limiting the range of sensations they can produce.
An ERM Motor
ERMs are most often found in gaming controllers and have recently been found in automotive use cases, due to their ability to produce strong and active vibrations. However, as of 2022, market analysts predict a slow shift towards LRAs within gaming, spearheaded by the launch of the PlayStation 5 DualSense controllers. Other industries, such as smartphones and wearables, are also shifting to LRA adoption.
2. Linear Resonant Actuator (LRA) Motors:
Linear Resonant Actuators (LRAs) are commonly found in wearables and smartphones. LRA Motors consist of a magnet attached to a spring, surrounded by an electromagnetic coil and housed in a casing. The coil is used to drive the motor by moving the mass back and forth within the housing, creating the vibrations we feel.
LRAs offer faster response times and more efficient power usage than ERMs, making them a popular choice for devices that require quick haptic feedback. However, they're more expensive than ERMs, and the spring is susceptible to wear and tear.
A type of LRA Motor
The most ubiquitous LRA motor is Apple's Taptic Engine, used in every Apple smartphone since the iPhone 6s. After its release in 2015, other smartphone companies followed this trend, adding using LRAs for their high-end and mid-end models. Most smartphones now use LRAs rather than ERMs for their haptic effects.
A type of LRA Motor
Piezoelectric actuators work by applying a voltage to piezoelectric material, which causes it to change shape and produce vibration. These actuators can produce highly detailed haptic feedback, making them ideal for applications where precision is key, such as in advanced medical devices. However, they’re considered to be rather fragile and are susceptible to breaking.
A Piezoelectric Actuator
Despite their small market share in the actuator industry, piezoelectric actuators are still widely used today. They can be found in laptop trackpads, satellites, and small medical devices. Piezoelectric actuators also have a good opportunity to grow in emerging markets such as AR/VR and wearable technology, where ERMs have been deemed to be a poor fit.
4. Linear Magnetic Ram (LMR) Motors
Linear Magnetic Ram (LMR) is one of the latest additions to the haptics industry. Based on solid-state magnetic suspension technology, it works by driving a suspended mass through a magnetic field. This movement is controlled by an electric current, which can be adjusted to change the position, speed, and force of the mass. This allows for precise control over haptic feedback.
An LMR Motor
What sets LMRs apart from other haptic actuators in the market is their wideband capability, with the ability to cover anything from 10Hz – 300Hz. They also use no springs or flexures, which makes them more durable than other haptic motors in the market. Moreover, they consume significantly less power compared to LRAs and ERMs, making them a more efficient choice for haptic motors.
LMRs are extremely versatile and can be utilized in a wide range of applications. These include gaming controllers, VR/XR peripherals, wearable technology, and in the automotive industry.
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本文由Vicky转载自TITAN HAPTICS News，原文标题为:Haptic Technology 101: A Beginner’s Guide to the Different Types of Vibration Motors，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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