What are the special requirements for the control system using a subdivision drive?
The subdivision of the drive will make a qualitative leap in the performance of the motor, but this is all generated by the drive itself, independent of the motor and control system. When using, the only thing the user needs to pay attention to is the stepping angle of the stepping motor. This will affect the frequency of the stepping signal sent by the control system, because the step angle of the stepping motor will change after subdivision. Small, the frequency of the step signal is required to be increased accordingly. Take the 1.8 degree stepping motor as an example: the step angle of the driver is 0.9 degrees in the half step state, and the step angle is 0.18 degrees in the ten subdivision, so that the control system sends out when the required motor speed is the same. The frequency of the step signal is 5 times that of the half step when it is subdivided. What is the holding torque (HOLDING TORQUE)?
The subdivision of the drive will make a qualitative leap in the performance of the motor, but this is all generated by the drive itself, independent of the motor and control system. When using, the only thing the user needs to pay attention to is the stepping angle of the stepping motor. This will affect the frequency of the stepping signal sent by the control system, because the step angle of the stepping motor will change after subdivision. Small, the frequency of the step signal is required to be increased accordingly. Take the 1.8 degree stepping motor as an example: the step angle of the driver is 0.9 degrees in the half step state, and the step angle is 0.18 degrees in the ten subdivision, so that the control system sends out when the required motor speed is the same. The frequency of the stepping signal is five times that of the half step when it is subdivided.
What is the accuracy of the stepper motor? Do you accumulate?
The accuracy of a general stepper motor is 3 to 5% of the step angle. The single-step deviation of the stepping motor does not affect the accuracy of the next step, so the accuracy of the stepping motor does not accumulate.
What is the allowable temperature of the stepper motor?
Excessive temperature of the stepper motor will first demagnetize the magnetic material of the motor, resulting in a drop in torque or even loss. Therefore, the maximum temperature allowed for the appearance of the motor should depend on the demagnetization point of the magnetic material of the different motors. In general, the demagnetization point of magnetic materials is above 130 degrees Celsius, so the external temperature of the stepper motor is completely normal at 80 to 90 degrees Celsius.
Why does the torque of the stepper motor decrease as the speed increases?
When the stepper motor rotates, the inductance of each phase winding of the motor will form a back electromotive force; the higher the frequency, the larger the back electromotive force. Under its action, the motor decreases with increasing frequency (or speed), resulting in a drop in torque.
Why does the stepper motor run normally at low speeds, but if it is higher than a certain speed, it cannot be started and accompanied by howling?
The stepping motor has a technical parameter: the no-load starting frequency, that is, the pulse frequency that the stepping motor can start normally under no-load conditions. If the pulse frequency is higher than this value, the motor cannot start normally, and lost or blocked may occur. In the case of load, the starting frequency should have an acceleration process, that is, the starting frequency is low, and then rise to the desired high frequency (motor speed increases from low speed to high speed) with a certain acceleration. The no-load starting frequency is generally twice the number of pulses required for one revolution of the motor.
How to overcome the vibration and noise of two-phase hybrid stepping motor at low speed?
The large vibration and noise of the stepping motor at low speed is its inherent shortcoming. Generally, the following solutions can be used to overcome:
A. If the stepping motor works just in the resonance zone, the stepping motor running speed can be improved by the constant reduction ratio.
B. Using a drive with subdivision, this is the most common and easiest way. Because the phase current of the subdivided driver motor changes more slowly than the half step.
C. Change to a stepper motor with a smaller step angle, such as a three-phase or five-phase stepper motor, or a two-phase subdivision stepper motor.
D. Switch to DC or AC servo motor to almost completely overcome vibration and noise, but the cost is high.
E. A magnetic damper is added to the motor shaft. This product is available on the market, but the mechanical structure changes greatly.
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