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Design Considerations

The electrical compatibility between the motor and the driver are the most critical factors in a stepper motor system design. Some general guidelines in the selection of these components are:

INDUCTANCE

Stepper motors are rated with a varying degree of inductance. A high inductance motor will provide a greater amount of torque at low speeds and lower torque at higher speeds.

MOTOR STIFFNESS

By design, stepping motors tend to run stiff. Reducing the current flow to the motor by a small percentage will smooth the rotation. Likewise, increasing the motor current will increase the stiffness but will also provide more torque. Trade-offs between speed, torque and resolution are a main consideration in designing a step motor system.

MOTOR HEAT

Step motors are designed to run hot (50º-90º C). However, too much current may cause excessive heating and damage to the motor insulation and windings. AMS step motor products reduce the risk of overheating by providing a programmable Run/Hold current feature.