When the ship lifting motor is cabling, no motor control circuit is built on the winding or inserting pattern board, and the use of high frequency printed circuit wiring is important to prevent the pulse jitter. There is usually excessive noise at the input of the current detection sensor or the error signal amplifier. Therefore, the printed circuit layout should have a small current signal and a high drive output buffer ground, and should return to the power input filter capacitance by separate paths. In the same direction of VCC, Vref and error amplifier, it is necessary to connect a ceramic capacitor (0.01 mu F) near the integrated circuit, depending on the layout of the visual circuit. However, all the high current circuits should be as short as possible, and the copper wire should be used as far as possible to reduce the EMI radiation.