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actuators:erm [2022/03/21 20:59] – [Types of ERMs] jonathan.lane-smithactuators:erm [2022/04/07 15:56] (current) – [Advantages & Disadvantages] jonathan.lane-smith
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-====== ERM Motors (still in progress) ======+====== ERM Motors ======
  
 ERM (Eccentric Rotating Mass) motors are a form of vibration motors that work by spinning an off-center mass. The radial forces that are generated from this movement cause the motor to oscillate back and forth, resulting in vibration. ERM motors are very affordable options for generating simple vibrations. ERM (Eccentric Rotating Mass) motors are a form of vibration motors that work by spinning an off-center mass. The radial forces that are generated from this movement cause the motor to oscillate back and forth, resulting in vibration. ERM motors are very affordable options for generating simple vibrations.
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 Shaftless motors, also known as "coin" or "pancake" motors, are thin coin-shaped motors in which the eccentric mass is enclosed. Because these motors can be much smaller than the other shafted motors, they are often used for wearable haptic displays. Shaftless motors, also known as "coin" or "pancake" motors, are thin coin-shaped motors in which the eccentric mass is enclosed. Because these motors can be much smaller than the other shafted motors, they are often used for wearable haptic displays.
  
-{{:actuators:erm3.png?300|}} ((https://sc04.alicdn.com/kf/H33750e449a68422c88f4374c3ce440fdT.jpg))+{{:actuators:erm3.png?300|}} ((https://www.alibaba.com/product-detail/The-Worlds-Smallest-ERM-3V-DC_62437101728.html))
  
 ===== Advantages & Disadvantages ===== ===== Advantages & Disadvantages =====
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 ERM motors are fairly simple, reliable, and affordable, making them popular choices for haptic displays. The actual motor of an ERM motor is a DC motor, which makes it very easy to connect ERM motors to microcontrollers such as Arduinos. ERM motors are fairly simple, reliable, and affordable, making them popular choices for haptic displays. The actual motor of an ERM motor is a DC motor, which makes it very easy to connect ERM motors to microcontrollers such as Arduinos.
  
-The biggest disadvantage of ERM motors is that the frequency and amplitude are linked together. If the motor is spinning slowly, it will have a low frequency and amplitude, and if the motor is spinning quickly, it will have a high frequency and amplitude. For applications in which it is important for the frequency and amplitude to be independently set, ERM motors are not suitable choices. +One main disadvantage of ERM motors is that the frequency and amplitude are linked together. If the motor is spinning slowly, it will have a low frequency and amplitude, and if the motor is spinning quickly, it will have a high frequency and amplitude. For applications in which it is important for the frequency and amplitude to be independently set, ERM motors are not suitable choices.  
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 +Another disadvantage of ERM motors is that because they use DC motors, their response time is fairly high. This means that they may not be suitable for applications in which they vibrate with accompanying audio.
  
 ===== ERM Examples ===== ===== ERM Examples =====