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Harvard's 'Kilbots' Driven Using Vibration Motors

  • 18 August 2014
    • Harvard SEAS' "Kilobot"
The School of Engineering and Applied Sciences at Harvard University have created an amazing group of autonomous robots called ‘Kilobots’. The key detail is the robots are able to work together and arrange themselves into complex structures. To position themselves, the robots use two coin vibration motors with an impressive degree of accuracy! Whilst the Kilobots have been in development for some time, SEAS as released a new video showing 1024 of them making different shapes: The locomotion looks…

Motor Current Limiting with USB Power IC

  • 16 July 2014
    • Connecting a USB current power IC to a motor
This blog post outlines DC motor current limiting using a USB power switch IC. USB current switches are readily available and low cost. DC motors draw most current when in a steady state stall condition, as there is no back EMF or inductance effect to limit current flow. In this situation, the high current draw can waste energy (a concern for portable devices) or overheat and damage the part. For other techniques of limiting current, see our "5 Methods…

AB-023 Released : Motor Driver Resource

  • 9 July 2014
    • M10-400 BLDC Evaluation Board
With our experience in testing all of our different types of motors, we’ve naturally used a range of different drivers to power the motors. It’s also a fairly frequent customer enquiry, we often field design questions including driving techniques. So we’ve collected together a list of different driver chips that we have used ourselves or would recommend. The list covers: Transistors H-bridges Vibration Motor Drivers Haptic Feedback Chips Brushless Motor Drivers Use it to help narrow your search and…

High Side Current Sensing for DC Motors

  • 29 June 2014
    • Current Sensing Circuit
This blog post describes a simple and accurate way to measure the current in a DC motor circuit. Perhaps the most obvious method for measuring current is to use an ammeter. However should you wish to plot the current over time on an oscilloscope or measure the current with a microcontroller, it is necessary to convert this current to a voltage. One method is simply to purchase a current sensing IC, however the same functionality can be achieved with…

Driving Multiple Actuators from a Single Source

  • 20 June 2014
    • Motors connected in series, steady-state
Introduction Please note: If you are reading this blog post as part of our monthly tech email bulletin, it includes some equations that may not render properly in your inbox. To view the article in full with your web browser click this link. If you are looking to run more than a single motor from a driver or MOSFET you may be concerned with the additional power consumption and exactly what happens in the circuit. We’ll look at series…

308-103 Released - High Vibration Amplitude ERM

  • 13 November 2012
    • 308-103 High Amplitude ERM Vibrating Motor
Here at Precision Microdrives we have released a new high amplitude eccentric rotating mass vibration motor, the 308-103. Built from a high torque 3 V DC motor, the 308-103…

High Vibration Long-Life Brushless Vibration Motor : 912-101 Released

  • 16 July 2012
    • 912-101 Brushless Vibrating Motor
We have released a new brushless vibration motor, our first in a cylindrical form factor. Brushless vibration motors have a significantly improved lifetime over the commonplace ‘brushed’ vibration motor…

Our First Horizontal Linear Resonant Actuator (LRA) for Haptic Feedback : C13-000

  • 23 April 2012
    • C13-000 Linear Resonant Actuator
Update: Unfortunately we are no longer able to offer the C13-000 horiztonal LRA, please use the contact form below to enquire about a suitable replacement. Our latest Linear Resonant…
  • 308-103 ERM Vibrating Motor Ad
  • Product Release :: 308-103
  • New high amplitude eccentric rotating mass vibrating motor. Strongest sub-12mm vibration motor available!