The price of stepper motor drivers on the market is mor […]
The price of stepper motor drivers on the market is more than twice the price of motors: For the sake of economy, we set out to make our own drivers. The starting frequency and acceleration performance of the stepper motor tow load on the embroidery machine determine that the maximum operating frequency of the motor speed is less than 4khz. The five-phase hybrid stepping motor drivers developed by several domestic manufacturers have excellent operating performance. For example, they can drive the stepping motor to rotate at high speed, and the no-load operating frequency is as high as 80-100khz. However, to solve the problem of fast driving of the power amplifier tube, it will undoubtedly increase the complexity of the circuit and increase the cost. And from the torque-frequency characteristic curve of the motor, when it is higher than 4khz, the curve drops rapidly, which indicates that the load capacity of the motor becomes worse. Therefore, for stepping motors with heavy loads, the practical operating frequency is much lower than the maximum no-load operating rate. For this reason, we combined the drivers of the x and y motors into one chassis, and shared an 8751 single-chip microcomputer to replace the two hardware pulse ring distributors. All high-power tubes use field-effect power tubes (mosfets), and appropriately simplify the field effect. Control the circuit of constant current drive system.