## AB-026 Updated – One Last Method for Sensorless Speed Stabilisation

AB-026 has been updated to include one further method for stabilising DC motor speed, without the use of external sensors. This final method uses a ‘Sample and Hold’ circuit to store the value of the motor’s back EMF – which is proportional to the motor speed.

## VAB-01 Released : Introductory Gear Equations

We are pleased to announce we have recently completed our first Video Application Bulletin! It is based on the Application Bulletin 024: Introductory Gear Equations, serving as a guide to the basics of gearing and spur gear chains. Aside from this blog post, you can also

## Why Use ‘Maximum’ Start Voltages?

You can use the voltage to adjust the speed of a motor, commonly with vibration motors this is used to vary the vibration amplitude. But just how low can the voltage be whilst ensuring the motor still operates? We previously included the Certified Start Voltage on our

## AB-025 Released : Using SPICE to Model DC Motors

Our latest Application Bulletin walks through modelling DC motors in SPICE. For those unfamiliar with SPICE, it’s a very popular open source program designed to let you build and simulate electrical circuits. It’s widely used by students and professionals, but as with all software, it requires some

## AB-024 Released : Introductory Gear Equations

Our latest application bulletin is slightly less challenging than some recent releases but tackles a topic which generates a lot of support requests – how to calculate speed and torque in gear chains. We carry a wide range of gear motors, but there are obviously instances where creating

## High Side Current Sensing for DC Motors

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 overtime on an oscilloscope or measure

## Driving Multiple Actuators from a Single Source

Introduction 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 and parallel connections, highlighting what this means for drivers. In addition, there’s

## AB-022 Released : PWM Frequency for Linear Motion Control

We’ve previously covered how to drive vibration motors with PWM signals, making a key simplification about the nature of how the motor responds to the on/off nature of the PWM signal. To make things easier we assume the motor behaves with a linear response. It’s a

## AB-021 Released: Measuring RPM from Back EMF

Our new application bulletin will help you calculate the speed of a DC motor without adding external hall sensors, encoders, or dedicated measurement components. Utilising an Analogue to Digital Converter, which can often be found on the microcontroller creating the PWM, the article discusses the theory behind

## 5 Methods of Circuit Protection for Gearmotors Part 2

Note: this is the second of two posts, continuing on from this post. 3) Use a Current Shunt Monitor   Current shunt monitoring takes two forms – high side and low side current sensing. Each has their own advantages/disadvantages and each is available as analogue or digital output devices. Current