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Tech Blog

MTTF published results for vibration motors 307-103 and 307-104

Posted on2 Mar, 201813 Dec, 2019

Introduction At PMD we not only manufacture high-quality miniature motors and mechanisms, but we also design and make our own testing equipment. This means that we have a wide range of proprietary dynamometers, environmental and longevity testing equipment so that we can have confidence in the Continue reading

CategoriesTech BlogTagsCoreless Motor, Haptic Feedback, Longevity, Mean Time to Failure, Motor Testing, MTTF, Testing Motors, Vibration Motors, Weibull Plot

When LRA’s don’t behave as expected (Part 2 of 2)

Posted on5 Feb, 201813 Dec, 2019

This blog post is part two of a 2-part series. Part one was a quick recap of how LRA’s work and how they are driven by dedicated driver ICs. This part is about what happens when the LRA’s don’t work entirely as expected with selected Continue reading

CategoriesTech BlogTagsBEMF, Linear Resonant Actuators, LRA's, Vibration Motors

When LRA’s don’t behave as expected (Part 1 of 2)

Posted on21 Dec, 201713 Dec, 2019

This blog post is part one of a 2-part series. Part one is a quick recap of how LRA’s work and how they are driven by dedicated driver ICs. Part 2 is about what happens when the LRA’s don’t work entirely as expected with selected Continue reading

CategoriesTech BlogTagsBEMF, Linear Resonant Actuators, LRA's, Texas Instruments, TI, Vibration Amplitude, Vibration Frequency, Vibration Motors

Vibrating Christmas Tree Instructable from our London Engineering Team

Posted on11 Dec, 201728 Nov, 2019

Introduction Christmas time in Northern European countries is a time of rest, feasting for the cold months ahead, and spending time with family. For our readers with children, you’ll know all too well that keeping them busy and engaged is important. Also being engineers, Christmas Continue reading

CategoriesTech BlogTagsCircuit Building, Festive Project, Vibration Motor

Choosing an NTC for a current limited battery powered motor applications

Posted on15 Nov, 201728 Nov, 2019

Introduction On our last blog post, we talked about motor surge protection in battery-powered systems. One of the suggested methods was adding a Negative Temperature Coefficient (NTC) thermistor, but we didn’t explain how to choose an NTC for a project that includes miniature motors. The Continue reading

CategoriesTech BlogTagsBattery, Battery Protection, Case Study, NTC, Overcurrent

Motor Surge protection in battery powered systems

Posted on2 Nov, 201728 Nov, 2019

Introduction When considering a project including a miniature motor, the selection of the appropriate battery is crucial. Many variables may come into consideration, and a balance in regards to requirements is often necessary. Li-Po rechargeable batteries are the preferred option for many of our customers Continue reading

CategoriesTech BlogTagsBattery Protection, NTC, Overcurrent, Thermistor

Connecting external actuator (vibration motor) to the M20-200 Haptics Kit

Posted on27 Oct, 201728 Nov, 2019

Introduction Our haptic feedback evaluation kit is an inexpensive tool for everyone interested in implementing a vibration alerting or haptic feature into a project. It allows application engineers and designers to understand the performance of the various actuators that we produce. It can also be Continue reading

CategoriesTech BlogTagsArduino, Eccentric Rotating Mass Vibration Motor, ERM's, Haptic Effects, Haptic Feedback, Haptic Feedback Evaluation Kit, Haptic Technology, Linear Resonant Actuators, LRA's

Decay Modes for Motor H-Bridge Drivers

Posted on26 Feb, 201728 Nov, 2019

Recently we had a few customers asking about driving our DC gear motors with H-bridges, and specifically, whether they would need additional fly-back diodes for each transistor in the bridge. As it happens – you don’t, and there are a few options that can be Continue reading

CategoriesTech BlogTagsBack Electromotive Force, BEMF, DC Motors, Decay Modes, Fast Decay, Gearmotors, H-bridges, Slow Decay, Stepper Motors

New Haptic Feedback Evaluation Kit tutorial: Driving multiple LRAs

Posted on3 Jan, 201728 Nov, 2019

  We recently added a new tutorial for the M20-200 Haptic Feedback Evaluation Kit, which looks at driving multiple LRAs from a single source. Unfortunately, driving multiple LRAs at the same time is extremely problematic for a single haptic driver as many of the excellent Continue reading

CategoriesTech BlogTagsArduino, Haptic Feedback, Haptic Feedback Evaluation Kit, Haptic Technology, Linear Resonant Actuators, LRA's

Benefits of PCB Backpacks

Posted on20 Nov, 20169 Dec, 2019

Our larger DC motors commonly have terminal power pins, as opposed to SMD motors or ones with power leads. Whilst in some applications this can be a drawback, others appreciate the flexibility offered – bear in mind that larger motors have a much wider range Continue reading

CategoriesTech BlogTagsDC Motors, Electrical Interference Suppression, PCB Backpacks

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