Motor 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. Stepper motor electrical pulse signal into angular displacement or linear displacement of open loop control stepping motor. In the case of the overload, motor speed, stop position depends only on the pulse signal frequency and pulse number, and not affected by load change, when the stepper driver receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed point of view, called & other; Interval Angle & throughout; , its rotation is based on the Angle of the fixed step by step. Can be controlled by controlling the pulse number of angular displacement, so as to achieve the purpose of accurate positioning; As well as by controlling the pulse frequency to control motor rotation speed and acceleration, so as to achieve the purpose of regulating. A, change direction when pulse, were characterized by any one direction, but a change of direction is the cumulative deviation, the more and more wide; Second, the initial velocity is too high, the acceleration is too big, cause sometimes lose step; Three, on the occasion of synchronous belt software compensation too little or too much; Four, the motor power is not enough; Five, the controller misoperation caused by six, drive the interference interference caused; Seven, software defect; Has the following solutions: 1)Stepper motor drives the direction of the general and the pulse signal has certain requirements, such as: the direction signal in a rising or falling edge of (Different drive requirement is different)Few microseconds identified before arrival, otherwise there will be a pulse operation Angle and turning instead of actual need, zui after fault phenomenon characterized by more walk more wide, subdivide the smaller obviously, solution mainly use software to change the hair, the logic of pulse or delay. 2)Due to the characteristic of the stepper motor velocity cannot be too high, especially with large load inertia cases suggest that initial velocity under 1 r/s, this impact is small, the same acceleration is too great shock to the system is big, easy to overshoot, lead to no motor positioning between forward and reverse due and certain pause time without will overshoot caused by reverse acceleration is too big. 3)According to the actual situation adjusted by compensation parameter values, (Because of the synchronous belt elastic deformation is bigger, so need to add a certain amount of compensation when changing direction)。 4)Appropriately increase the motor current, and improve the drive voltage (Pay attention to the matching motor drive)Choose some torque of the motor. 5)Interference system cause the misoperation of controller or drive, we can only try to find out the interference sources, to reduce the interference ability (Such as shielding, enlarging the distance, etc. ), cutting off route of transmission, improve the anti-interference ability of their own, the common measures: (1) with double lines shielded wire instead of conventional wire, the signal in the system with the big electric current or voltage change wire separate wiring, reduce the electromagnetic interference ability. (2) the interference from power grid with the power filter wave filtering, under conditions permit the input terminal of electrical equipment and power supply filter, reduce the interference between each device in the system. (3) equipment between zui use photoelectric isolating device to transmit signal, under the conditions permit, pulse and direction signals zui signals with finite difference method and photoelectric isolation. In the inductive load (Such as electromagnetic relay, solenoid valve)With resistance capacity to absorb or discharge circuit quickly, inductive load at the beginning moment can produce 10 to 100 times the peak voltage, if working frequency in more than 20 KHZ. 6)Do some fault tolerance software, the interference effects.
