(1) Even with the same stepper motor, the torque frequency characteristics are quite different when using different drive schemes.
(2) When the stepping motor is in operation, the pulse signal is alternately applied to each phase winding in a certain order (the ring winding in the driver controls the winding to be powered off and on).
(3) Stepper motor is different from other motors, its nominal rated voltage and rated current are only reference values; and because the stepper motor is powered by pulse, the power supply voltage is its highest voltage, not the average voltage, so stepping The motor can work beyond its rated range. However, the selection should not deviate too far from the rated value.
(4) There is no accumulation error of the stepping motor: the accuracy of the general stepping motor is three to five percent of the actual step angle, and does not accumulate.
(5) The maximum temperature allowed by the appearance of the stepping motor: If the temperature of the stepping motor is too high, the magnetic material of the motor will be demagnetized first, which will cause the torque to drop and even lose the step. Therefore, the maximum temperature allowed by the motor surface should depend on the magnetic material of different motors. Demagnetization point; in general, the demagnetization point of magnetic materials is above 130 degrees Celsius, and some even up to 200 degrees Celsius, so the external temperature of the stepper motor is completely normal at 80-90 degrees Celsius.
(6) The torque of the stepping motor will decrease with the increase of the speed: when the stepping 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.
(7) The stepping motor can run normally at low speed, but if it is higher than a certain frequency, it cannot be started, 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 be lower. If the motor is to be rotated at a high speed, the pulse frequency should have an acceleration process, that is, the starting frequency is low, and then rise to a desired high frequency (the motor speed is increased from a low speed to a high speed) at a certain acceleration.
(8) The power supply voltage of the hybrid stepping motor driver is generally a wide range (for example, the power supply voltage of the IM483 is 12 to 48 VDC), and the power supply voltage is usually selected according to the operating speed and response requirements of the motor. If the motor has a higher operating speed or a faster response, the voltage is also higher, but note that the ripple of the supply voltage cannot exceed the maximum input voltage of the drive, otherwise the drive may be damaged.
(9) The power supply current is generally determined based on the output phase current I of the driver. If a linear power supply is used, the power supply current can generally take 1.1 to 1.3 times of I; if a switching power supply is used, the power supply current can generally take 1.5 to 2.0 times of I.
(10) When the offline signal FREE is at a low level, the current output from the driver to the motor is cut off, and the motor rotor is in a free state (offline state). In some automation equipment, if the motor shaft (manual mode) is required to be directly powered while the drive is uninterrupted, the FREE signal can be set low, the motor can be taken offline, and manually operated or adjusted. After manual completion, set the FREE signal high to continue automatic control.
(11) Adjust the direction of rotation of the two-phase stepper motor after power-on in a simple way. Simply swap the A+ and A- (or B+ and B-) wires of the motor and the driver.
(12) The four-phase hybrid stepping motor is generally driven by a two-phase stepping driver. Therefore, the four-phase motor can be connected to two phases by series connection or parallel connection. The series connection method is generally used in the case where the motor speed is low. In this case, the required output current of the driver is 0.7 times of the motor phase current, so the motor generates less heat; and the connection method is generally used in the case where the motor speed is high (also called high speed connection). Method), the required driver output current is 1.4 times of the motor phase current, so the stepper motor generates a large amount of heat.
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