How to Select a Can Stack Motor

Motor diameter

The motor diameter (sometimes referred to as frame size) is the diameter to the nearest mm of the motor casing. Matching the motor diameter to the available space in the application is typically the best place to start when sizing a motor. In general, larger frame size motors deliver more torque.

Rotor size

This is a letter code that refers to the size of the rotor within the motor. While a larger rotor will provide more torque, it will not always affect the size of the motor.

Steps per revolution

A larger number of steps per revolution will result in a smaller step angle, resulting in greater angular position resolution and less torque ripple. More steps will also result in more torque, but lower speed.

Magnet type

Stronger magnets will provide more torque in the same size with the same current draw. Ferrite magnets are lower strength but lower cost, while Neodymium magnets are higher strength for high-performance applications.

Rated voltage

A voltage that is closest to the supply voltage is typically recommended. In some cases, higher than rated voltages can be used to increase performance.

Driver Type

The type of motor chosen should match the type of driver used in the application.