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Stepper motor design _ mechanical precision stepper motor

by:Zhenyu     2020-10-25
Stepper motor drive mode is commonly used full voltage drive, namely walks and lock in the planetary gear motor load rated voltage. Stepper motor is a kind of induction motor, its working principle is the use of electronic circuit, direct current (dc) into time-sharing power supply, multiphase sequential control current, in this current for stepper motor power supply, step motor to work properly, is time-sharing power supply for step motor drive, multiphase timing controller. In order to avoid the motor over-current and improvement of driving characteristics, needs and current limiting resistor. Due to the lock of the stepper motor, current limiting resistor to consume large amounts of power, so the current limiting resistor should have greater power capacity, and the switch tube also have higher load capacity.



of the stepper motor drive mode is a kind of high and low voltage drive, namely when the motor is diverted, rated or exceed the rating voltage, so that in the larger current, driven by rapid move to make motor; While in lock step is lower than the rating voltage, only let step motor winding through the lock needed for the current value. Stepper motor driver in order to further improve the drive systems of high frequency response, frequency boost power driver interface can be used up. The interface provided by the winding voltage and the operating frequency of the motor into linear relationship. Its main circuit is actually a switch regulated power supply, use of frequency - Voltage converter, drive pulse frequency conversion into dc level, and the level to control switch regulated power supply input, this constitutes a frequency feedback power driver interface. In this way, can reduce power (the resistor Refers to the object of the work done in a unit time) Consumption, and can improve the speed of the motor, but this way of driving circuit is more complicated.



the distribution of the drive pulse method that can be used hardware box pulse distributor. Now, pulse distributor has been standardized, chips, can buy in the market. But the hardware method of complex, the cost is higher also.



stepper planetary gear motor control ( Including the control pulse generation and distribution) Can also use the software method, which USES singlechip microcomputer, simplify the circuit already so, also reduces the cost. Stepper motor driver stepper motor can't directly to the power frequency ac or dc power supply work, and must use a dedicated driver, as shown, it is controlled by pulse generating unit, power drive unit, protection unit, etc. Figure midpoint line surrounded by two units can be done with microcomputer control. Using single-chip microcomputer software way to drive stepping motor, not only can programmatically, freely within a certain range of stepping motor rotation speed, rotation Angle and the rotation number of back and forth, etc. , but also convenient and flexible to control stepping motor running state, in order to meet the requirements of different users. As a result, often called single-chip stepper motor control circuit programmable stepper motor drives.


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