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Terminology related to stepper motor and screw motor

2022-12-29

Latest company news about Terminology related to stepper motor and screw motor

Positioning/residual torque: the torque required to rotate the output shaft of the motor when no current passes through the winding.

 

Holding torque: the torque required to rotate the output shaft of the motor when the winding is powered with steady DC.

 

Dynamic torque: under a certain step rate, the torque generated by the motor can generally be expressed by the pull in or pull out torque.

 

Pull in torque: the acceleration torque to overcome the rotor inertia, as well as the external load and various friction torques fixedly connected during acceleration. Therefore, the pull in moment is usually less than the pull out moment.

 

Pulling out torque: the maximum torque that the motor can produce at a constant speed. Since the velocity is constant, there is no moment of inertia. At the same time, the kinetic energy and inertial load inside the rotor increase the pull out torque.

 

Driver: an electrical control device used to run the stepping motor, including power supply, logic programmer, switch components and a variable frequency impulse source to determine the step rate.

 

Inertia: the inertial measurement value of an object for acceleration or deceleration, which is used for the inertia of the load to be moved by the motor or the inertia of the motor rotor.

 

Step angle: the rotation angle generated by each step of the rotor in the whole step

 

Step length: a linear stroke generated by the screw rod for each step angle of rotor rotation.

 

Pulse rate: the number of pulses per second applied to the motor winding, that is, the number of pulses per second pps.

 

Speed up and down: when the motor does not lose step, the given load increases from the original low step speed to the maximum, and then decreases from the original high step speed to the original speed.

 

Lead accuracy: the deviation between the actual position and the theoretical position obtained based on the lead.

 

Repetitive positioning accuracy: the deviation between the motor being commanded to the same target position under specific conditions.

 

Temperature rise: temperature rise is the temperature difference between the motor and the environment, which is caused by the heating of

the motor itself. During operation, the iron core of the motor will produce iron loss in the alternating magnetic field, and copper loss will occur

when the winding is energized, as well as other losses, which will increase the temperature of the motor. It is a very important index in motor design and operation.

 

Resolution: the linear distance generated when the motor receives a pulse in the whole step.

 

Resonance: Since the motor is an elastomer system, the stepping motor has a natural resonance frequency. When the step rate is equal to the natural frequency of the motor, resonance will occur, and the motor may produce audible noise changes, while the vibration increases. The resonance point will vary depending on the application and load, but it usually occurs at about 200pps. In serious cases, the motor may lose step near the oscillation point. Changing the step rate is the simplest way to avoid many problems related to resonance in the system. In addition, half step or micro step driving can usually reduce resonance problems. When accelerating or decelerating, it is necessary to cross the resonance area as quickly as possible.

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