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HomeNewsWhat are the characteristics of stepper motors?

What are the characteristics of stepper motors?

2020-09-12
(1) When the Stepper Motor is in operation, pulse signals are applied to the windings of each phase in turn in a certain order (the ring distributor in the drive controls the winding on and off).

(2) Even if it is the same stepping motor, when using different drive schemes, its torque-frequency characteristics are quite different.

(3) The highest temperature allowed on the surface of the Stepper motor: If the temperature of the stepper motor is too high, it will demagnetize the magnetic material of the motor, and then cause the torque to drop and even lose step. Therefore, the highest temperature allowed on the surface of the motor should depend on the different magnetic materials of the motor. Generally speaking, the demagnetization point of magnetic materials is above 130 degrees Celsius, and some even up to 200 degrees Celsius, so the surface temperature of the stepper motor is completely normal at 80-90 degrees Celsius.

(4) The stepper motor has no stacking errors: the accuracy of the general stepper motor is three to five percent of the actual step angle, and it does not accumulate.

(5) The torque of the stepper motor will decrease with the increase of the speed: when the stepper motor rolls, the inductance of each phase winding of the motor will form a back electromotive force; the higher the frequency, the greater the back electromotive force. Under its effect, the phase current of the motor decreases as the frequency (or speed) increases, and then the torque decreases.

(6) The stepper motor is different from other motors. Its nominal extra voltage and extra current are only reference values; and because the stepper motor is powered by a pulse method, the power supply voltage is its highest voltage, not the average voltage. The incoming motor can work beyond its rated value range. But the selection should not violate the rated value too far.

(7) When the offline signal FREE is low, the current output from the driver to the motor is blocked, and the motor rotor is in a free state (offline state). In some automation equipment, if the drive is required to directly roll the motor shaft (manual method), the FREE signal can be set low to make the motor offline for manual operation or adjustment. After the manual is completed, the FREE signal is set high again to continue automatic control.

(8) Use a simple method to adjust the rolling direction of the two-phase stepping motor after power-on, just swap the A+ and A- (or B+ and B-) of the motor and the drive wiring.

(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 be 1.1 to 1.3 times I; if a switching power supply is used, the power supply current can generally be 1.5 to 2.0 times I.

(10) The stepper motor can work normally at low speed, but if it is higher than a certain frequency, it cannot be started, accompanied by howling. The stepper motor has a technical parameter: no-load starting frequency, that is, the pulse frequency that the stepping motor can normally start under no-load conditions. If the pulse frequency is higher than this value, the motor cannot start normally and may lose step or stall. Under load, the starting frequency should be lower. If you want the motor to reach high-speed rolling, the pulse frequency should be accelerated, that is, the starting frequency is lower, and then it must be accelerated to the desired high frequency (the motor speed increases from low speed to high speed).

(11) The four-phase hybrid stepping motor is generally driven by a two-phase stepping driver. Therefore, the series connection or parallel connection method can be used to connect the four-phase motor into two phases when connecting. The series connection method is generally used in the occasions where the motor speed is low. The driver output current required at the moment is 0.7 times of the motor phase current, so the motor heat is small; the parallel connection method is generally used in the occasions where the motor speed is high (also called high-speed connection) ), the required driver output current is 1.4 times the motor phase current, so the stepper motor generates more heat.

(12) The power supply voltage of the hybrid stepping motor driver is generally a wide range (for example, the power supply voltage of IM483 is 12~48VDC), and the power supply voltage is generally selected according to the operating speed and response requirements of the motor. If the motor has a high operating speed or a faster response to the requirements, the voltage value is also high, but note that the ripple of the power supply voltage cannot exceed the maximum input voltage of the drive, otherwise the drive may be damaged.

Shenzhen Maintex Intelligent Control Co., Ltd.
Business Type:Manufacturer
Product Range:DC Motor , AC Motor , Stepper Motor
Products/Service:Stepper Motor , Brushless motor , Dc motor , treadmill used motor , Brushed Dc Motor , Fuji motor
Certificate:ISO14001 , ISO/TS16949 , ISO9001 , RoHS
Company Address:Zhengde Science Park, No. 8, Pingdi Street, Longgang District, Shenzhen, Guangdong, China

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