Glossary

General Specs  |  Basic Introduction of Step Motors  |  Construction and Operating Theory  |  Full, Half & Microstepping
Vibration and Resonance  |  Drivers and Winding Configuration  |  Winding Diagram and Switching Sequence
Torque and Speed Relationship  |  Conversion Factors  |  Glossary

To show details, place the mouse on each item of the glossary.   1. Holding Torque / Max Static Torque   2. Detent Torque   3. Step Accuracy   4. Torque / Speed Curve   5. Pulse Rate   6. Start / Stop region   7. Max Starting Frequency   8. Slew Range   9. Max Running Speed   10. Pull-in Torque (Curve)   11. Pull-out Torque(Curve)   12. Resonance The maximum external torque that can be applied to an energized step motor at 0 pps without causing continuous rotation. The torque required to rotate a non-energized step motor. This torque results from the magnet of a hybrid or PM (permanent magnet) rotor motor. A measure of a step motor's maximum deviation from its desired or indicated position, calculated as a percentage of the step angle. This deviations is non-cumulative, meaning that the deviation found in any number of steps is no greater than the maximum deviations found in a single step. Curve which shows the correlation between torque and speed. A curve is for a given motor and a given driver. Rate that successive pulses are sent or steps are initiated. Area on or underneath the pull-in curve. For any load value in this region , the motor can start , stop, or reverse "instantly" ( no ramping required) at the corresponding speed value. The frequency where it is possible to synchronize the step motor with its input frequency by accelerating and decelerating. The region between the pull-in and pull-out torque curves. A motor may operate in this range, but cannot start , stop or reverse without ramping. The maximum speed at which the motor can run without losing synchronism or missing steps from a standstill or stop without taking more steps than the pulses. A graph showing the maximum torque, for a given speed, where a load can be accelerated into synchronism from a standstill. A graph showing the maximum torque that can be applied to a motor operating at a given speed without losing synchronism. When a motor operated on no load over the entire frequency range, one or more natural oscillating resonance points may be detected. The range where a motors step rate is near the natural frequency of the motor is called resonance range. A motor operating in this range may experience excessive vibration.