Understanding Stepper Motor Specifications and Speed-Torque Characteristics

by Curry Lee Führende Dentalgeräte und Zahnarzt

Understanding Stepper Motor Specifications and Speed-Torque Characteristics

When buy cheap stepper motor for an application, the specifications of the stepper motor must be fully understood. The following table shows a typical list of specification of stepper motors.

1. Maximum Holding Torque

The holding torque is the maximum holding power (torque) the stepping motor has when power (rated current)

is being supplied but the motor is not rotating (with consideration given to the permissible strength of the gear

when applicable).

2. Rotor Inertia

This refers to the inertia of rotor inside the motor. This is necessary when the required torque (acceleration

torque) for the motor needs is calculated.

3. Rated Current

The rated current is determined by motor temperature rise. It is the current value that can flow to the motor

coils continuously at motor standstill.

4. Basic Step Angle

The step angle is the angular distance (in degrees) that the motor moves at the input of one pulse from the

driver.

5. Gear Ratio

This is the ratio in rotation speed between the input speed from the motor and the speed of the gear output

shaft.

6. Permissible Torque

The permissible torque represents the torque value limited by the mechanical strength of the gear when operated at a constant speed. The total torque including acceleration/deceleration torque should not exceed

this value.

7. Maximum Torque

This is the maximum torque that can be used instantaneously (for a short time). During acceleration/deceleration, the motor can be operated up to this value.

The play of gear output shaft when the motor shaft is fixed. When positioning in bi-direction, the positioning

accuracy is affected.

9. Angular Transmission Error

Angular transmission error is the difference between the theoretical angle of rotation of the output shaft, as calculated from the input pulse count, and actual angle of rotation.

10. Permissible Speed Range

This is the rotation speed that the motor can be operated at with the gear output shaft.

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