Step pitch Angle: correspond to one pulse signal

Step pitch Angle: correspond to
rotating joint one pulse signal, the motor rotor turned with the angular displacement said. = 360 degrees (rotor tooth number J * operation take number),

conventional two, four phase, rotor tooth for 50 tooth motor as an example. Four shoot operation time step pitch Angle for = 360 degrees / (50 * 4) = 1.8 degrees (commonly

known as synchronizing), eight take operation time step pitch Angle for = 360 degrees / (50 * 8) = 0.9 degrees (commonly known as half step).
Positioning torque: motor in cold state, the motor rotor own lock moment (by magnetic field profile of the harmonic and mechanical error caused by)
Static torque: motor in rated static electricity function, motor does not make the rotary motion, the motor shaft of locking torque. This moment is measured motor volume

(geometric size) standards, and drive voltage and drive power supply and so on have nothing to
rotary union do.
Although the static torque and electromagnetic field ampere turns direct proportion, and fixed tooth rotor of the air gap between relevant, but excessive use reduce air gap,

increase excitation ampere-turns to improve static moment is undesirable, this will cause the motor heating and mechanical noise.
4, stepping motor dynamic index and terms:
1, footsteps angular accuracy:
Stepping motor each turned a step from the Angle of the actual value with the theoretical value of the error. In percentage terms said: error/step pitch Angle * 100%. Different

operation number of beats its value is different, four shoot runtime should be in 5%, inside, eight pat run time should be within 15%.
2, step out of:
Motor running of operation steps, not equal to the theoretical steps. Call out of step.
3, disorder Angle:
Rotor tooth axis offset stator tooth axis Angle, the motor running will exist disorder Angle, the disorder from the Angle error, using subdivision drive is not solved.
4, maximum no-load starting frequency:
Motor in a drive form, voltage and rated electric shed, do not add load cases, can directly start of the maximum frequency.
5, maximum no-load operation frequency:
Motor in a drive form, voltage and rated electric shed, the motor load without the highest speed frequency.
6, operation torque frequency characteristics:
Motor in a test conditions in the operation of measured output torque and frequency relationship curve called operation torque frequency characteristics, this is the motor many

dynamic curve of the most important, is also motor selection basis. As below:
fiber optic rotary joint
Other characteristics and inertial frequency characteristics, starting frequency characteristic, etc.
Motor once chosen, motor static moment sure, and dynamic moment but otherwise, motor dynamic moment depends on the motor in operation of average current (rather than static

current), average current is larger, the motor output torque, i.e., the frequency characteristics of the motor is hard.
As below: