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Special Motor Improve The Resolution Of The Motor

Zhejiang Kening Motor Co.,Ltd | Updated: Jun 16, 2017

Stepping motor is a special motor for control, its rotation is a fixed angle (called "step angle") step by step operation, which is characterized by no accumulation of error (accuracy of 100%), so extensive Used in a variety of open-loop control.

The operation of the stepper motor is driven by an electronic device, which is a stepper motor driver which converts the pulse signal from the control system into an angular displacement of the stepper motor, or that the control system sends a pulse signal, The stepper motor is rotated by one step by the drive. So the speed of the stepper motor is proportional to the frequency of the pulse signal. Therefore, the control of the pulse pulse frequency, the motor can be precise speed control; control the number of step pulse, the motor can accurately locate the purpose.

Stepping motor through the subdivision drive drive, the step angle becomes smaller, such as the drive work in 10 subdivision state, the step angle is only 'motor inherent step angle' one-tenth, that is to say : When the drive is operating in a non-subdivided step, the control system sends a step pulse, the motor rotates by 1.8 °, and when the subdivision drive is operating in 10 subdivided states, the motor rotates only 0.18 ° Is the basic concept of subdivision. The subdivision function is generated entirely by the drive by precisely controlling the phase current of the motor, independent of the motor.

Special Motor The main advantages of the drive subdivision are: completely eliminate the low frequency oscillation of the motor. Low-frequency oscillation is inherent in the stepper motor (especially the reactive motor), and subdivision is the only way to eliminate it. If your stepper motor is to work in the resonant area (eg go arc), select the subdivision drive Is the only choice. Increases the output torque of the motor. Especially for three-phase reactive motor, the torque is not subdivided when the increase of about 30-40%. Improve the resolution of the motor. As a result of reducing the step angle, improve the uniformity of the step, 'improve the motor resolution' is self-evident. The above is the basic principle of stepper motor, then, for the stepper motor drive design, selection of actual combat experience to sum up: choose to keep the torque (HOLDING TORQUE).

Special Motor Holding torque, also called static moment, refers to the torque of the rotor when the stepper motor is energized but not rotated. Since the torque at the low speed of the stepping motor is close to the holding torque, and the torque of the stepping motor rapidly decays with the increase of the speed, the output power also changes with the increase of the speed, so that the holding torque is the step One of the most important parameters of motor load capacity. For example, the general description of 1N.m stepper motor, can be understood as to maintain the torque is 1N.m.

Select the number of phases

Special Motor Two-phase stepper motor low cost, step angle of at least 1.8 degrees, low vibration when the larger, high speed torque fast down for high speed and stability and stability requirements of the occasion is not high; three-phase stepper motor step Angle at least 1.5 degrees, the vibration ratio of two-phase stepper motor small, low-speed performance is better than two-phase stepper motor, the maximum speed than the two-phase stepper motor 30 to 50 percent higher for high speed and stability and stability requirements Higher phase; 5-phase stepper motor step angle is smaller, low-speed performance is better than 3-phase stepper motor, but the high cost, suitable for low-speed section and the accuracy and stability requirements of the higher occasions.

Select stepper motor

Special Motor Should follow the first choice of the motor after the election drive principle, first clear the load characteristics, and then by comparing the different models of stepper motor static moment and torque curve, to find the load characteristics of the most matching stepper motor; precision requirements, Deceleration device to make the motor work in the highest efficiency, the lowest state of noise; to avoid the motor work in the vibration area, if it must be by changing the voltage, current or increase the damping method to solve; power supply voltage, the proposed 57 motor DC 24V- 36V, 86 motor with DC 46V, 110 motor is higher than the DC 80V; large inertia load should be selected machine larger motor; large inertia load, the work speed is high, the motor should be used to speed up to speed To prevent the motor out of step to reduce noise, improve the positioning accuracy when the stop; in view of the stepper motor torque is generally below 40Nm, beyond the torque range, and the operation speed is greater than 1000RPM, it should consider the choice of servo motor, the general AC servo motor Normal operation at 3000RPM, DC servo motor can be normal operation at 10000RPM.

Select the drive and subdivision

Special Motor It is best not to choose the whole step state, because the whole step vibration when the larger; try to choose a small current, large inductor, low voltage driver; with greater than the working current of the drive, in the need for low vibration or high precision with subdivision Type drive, for high-torque motor with high-voltage drive in order to obtain good high-speed performance; in the actual use of the motor speed is usually high and the accuracy and stability requirements of the occasion is not high, do not have to select the high score driver, In order to save costs; in the actual use of the motor speed is usually very low conditions, should use a larger subdivision to ensure smooth operation, reduce vibration and noise; In short, the choice of subdivision, should take into account the actual operation of the motor Speed, load torque range, reducer settings, accuracy requirements, vibration and noise requirements.