Stepping drive prices _ manipulator with stepper motor manual
stepper motor from its structure form can be divided into reactive stepper motor, permanent magnet stepping motor, hybrid stepping motor, single-phase stepper motor, a variety of types, such as planar stepping motor in our country adopted by the stepper motor is given priority to with reactive stepper motor. The performance of the stepper motor and control mode has a close relationship, stepping motor control system from the point of its control mode, can be divided into the following three categories: open loop control system, closed loop control system, half closed loop control system. A half closed loop control system in actual applications generally classified as open loop or closed loop system.
reactive: are there on the stator winding and rotor is composed of soft magnetic materials. Simple structure, low cost, step Angle is small, can reach. 2° , but poor dynamic performance, low efficiency, big fever, difficult to ensure reliability.
permanent magnet, permanent magnet stepper motor rotor permanent magnet materials, the rotor pole and stator pole is the same. Is characterized by good dynamic performance, large output torque, step precision is poor, but the motor torque Angle ( As a general rule, be 7. 5° Or 5 & deg; ） 。
hybrid: combines reactive hybrid stepping motor and permanent magnet, the advantages of the multiphase winding on the stator, rotor with permanent magnet materials, have multiple small teeth on the rotor and stator step in order to improve the torque accuracy. Its characteristic is the output torque, good dynamic performance and interval Angle is small, but the complex structure, the cost is relatively high.
in the stator winding, a total of two phase, three-phase equals five series. Popular is the two-phase hybrid stepping motor, accounted for more than 97% of market share, high performance/price ratio, and the reason is, deserve to go up after subdivision driver effect is good. This kind of motor is apart from the Angle of the basics. 8° Steps/step, with the upper drive, from the Angle of reduced to zero. 9° With subdivision driver after the interval Angle can be subdivided by 256 times ( 0. 007° / micro step) 。 Due to friction and manufacturing precision, etc, the actual control precision is slightly lower. With the step planetary gear motor can match different subdivision drive in order to change the accuracy and effect.
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