Introduction Cogging is an undesirable characteristic of some permanent magnet motor designs. It’s also known in stepper motors as ‘detent’ or ‘no current’ torque. Cogging torque is generated when the sides of the rotor teeth line up with the sides of the stator teeth within
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
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
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
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
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
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
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
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
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