Application of stepping motor frequency conversion technology
The structural principle of the nautical compass simulator is that the rotation of the ship's steering wheel causes the change of the ship's heading, and at the same time it causes the change of the ship's compass reading. When the compass simulator requires the angle of rotation to be too large, the design uses the method of variable frequency rotation to overcome the shortcoming of the long rotation time, that is, to give a specific heading value that needs to be rotated, and the simulator can quickly and effectively go to the requirements. The value.
Selection and design of stepper motor
The stepping motor has the advantages of large torque, small inertia, high response frequency, and the like, and has the superior characteristics of instantaneous starting and rapid stopping. Compared with other drive components, there are obvious advantages: the displacement or speed can be accurately controlled without feedback; the output angle or displacement accuracy is high, and the error does not accumulate; the control system has a simple structure, is compatible with digital devices, and is inexpensive. . It has a fixed number of steps per revolution, which allows precise control of stepping and receiving digital quantities. In order to facilitate the processing and driving of the data, the stepping motor is designed to drive the reduction gear, and then the gear drives the compass data turntable. In order to improve the data accuracy and improve the load capacity of the motor, the reduction ratio is designed to be 1:90 (the smaller the ratio) The higher the accuracy, but the ratio is too small, the control and response frequency requirements are too high). The stepping motor can be energized in three-phase double-six-pulse mode, that is, it can be energized in the order of a, ab, b, bc, c, and ca, so that each pulse in the stepping motor can drive 1.5 degrees. The driving of the stepping motor is realized by software setting and power amplifying circuit, wherein the power amplifier is also called a driving circuit, and its function is to amplify the output pulse of the pulse generator, and provide sufficient current to the phase winding of the stepping motor to drive The stepper motor works normally. The requirements for the power amplifier include: sufficient amplitude can be provided; the excitation current is steeper at the front and rear edges; the power consumption is small, the efficiency is high; the operation is stable and reliable, the maintenance is easy, and the cost is low.
