Stepper motors from top manufactures

Stepper Motors

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What is a stepper motor?

Stepper motors are a type of brushless DC motor that move in small, precise amounts.

They feature a fixed stator containing multiple toothed electromagnets, at the centre of which is a toothed central rotor. The driver or micro controller generates a switching electrical current through the magnets. Then, magnetic forces attract the teeth on the central gear, causing it to rotate.

It’s these small movements of the gear that equate to the precisely defined movements of the motor. And, as the position of a stepper motor can be retained without power, it’s ideal for battery-powered applications.

These small DC motors are well-suited to a wide variety of industries. Thanks to their high precision, compact design, speed control and dynamic acceleration, their potential applications range from 3D printers and camera lenses to medical devices and CNC machinery.

To find out more about the products supplied by EMS, see our stepper motor range.

Types of stepper motor

These are the main types of stepper motor supplied by EMS:

Permanent magnet motors from FAULHABER

Within our stepper motor range is the permanent magnet motors from FAULHABER. These consist of a plastic sleeve rotor, containing multiple small permanent magnets.

The stator windings are energised alternately in two phases. It’s this alternating attraction and repelling of the magnetic fields between the central rotor magnet and surrounding permanent magnets that causes the rotor to move in steps.

Hybrid stepper motors explained

A hybrid stepper motor is a combination of the variable reluctance and permanent magnet motor type, offering high precision.

They have teeth that are offset on two different ‘cups’ around the magnet rotor. This allows for a smaller step angle (typically 1.8 degrees) to be achieved.

Microstepping
for accuracy

Rather than a full on/off voltage change, microstepping uses an incremental change of the voltage in the windings, typically following a sine waveform.

Moving between the phases in even smaller increments can lead to quieter operation with higher positioning accuracy.

Stepper motor buying guide

What should you consider when looking to specify a stepper motor?

One advantage is that they can remove the need for additional position feedback electronics, such as encoders. However, for this to be possible, it’s vital that the motor is correctly sized and rated for the application.

Other aspects to consider include the required step resolution, available space, power supply, speed profile and power supply. Environmental factors such as moisture, dust and temperature range are also important.

EMS supplies a variety of high-quality stepper motors from leading manufacturers FAULHABER and Nidec Advanced Motor (formerly Nidec Servo). These drives are optimised for a high-power density, with long service life to guarantee reliability.

For optimised performance and noise level, accompanying precision gearheads and stepper motor drivers are also available. Visit our stepper motor range to learn more about available products.

And, for tailored advice on how to select your stepper motor, contact our expert team.