Understanding Stepper Motor Specifications and Speed-Torque Characteristics
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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