1. Step error
It refers to the difference between the measured step angle and the theoretical step angle under no-load. It reflectsStepping motorAccuracy of angular displacement。
domesticStepping motorThe step error is generally in the range of ± 10 ′～ ± 30 ′, and the stepping motor with high precision can reach ± 2 ′～ ± 5 ′.
2. Maximum static torque
MeansStepper motorWhen a phase is always energized and in a stationary state, the maximum external torque it can bear, that is, the maximum electromagnetic torque it can output. It reflectsStepping motorBraking capacity of stepping motor and load capacity during low-speed stepping operation。 3. Start torque frequency characteristics
MeansStepping motorWhen there is an external load torque, the corresponding relationship between the maximum step input pulse frequency (also known as starting frequency) acceptable for normal start without out of step and the load torque.
When there is an external load torque, the corresponding relationship between the maximum step input pulse frequency (also known as starting frequency) acceptable for normal start without out of step and the load torque. 4. Start inertial frequency characteristics
MeansStepping motorThe relationship between starting frequency and moment of inertia when driving pure inertia load to start.
5. Operating torque frequency characteristics
MeansStepping motorThe relationship between output torque and input pulse frequency during operation. ChooseStepping motorWhen, the operating point corresponding to the actual operating frequency and load torque shall be located below the operating torque frequency characteristic to ensureStepping motorNormal operation without out of step。
6. Stepping operation and low frequency oscillation
When the input pulse frequency is very low, if the pulse period is greater thanStepping motorThe transition time,Stepping motorIt will be in a step-by-step operation state, which is called step-by-step operation.Stepping motorThere is a lower natural frequency. When the step operation frequency or low-speed operation frequency is equal to or close to the natural frequency, resonance will occurStepping motorThis phenomenon is called low frequency oscillation.
Methods to avoid low frequency oscillation：
One is to make the operating frequency avoid the natural frequency, and the other is to adjust it when the previous method is not allowedStepping motorTo change the natural frequency。
7. Maximum phase voltage and maximum phase current
Respectively refers toStepping motorThe maximum power supply voltage allowed to be applied and the maximum current flowing through each phase winding.