In the case of spring energy storage, when the closing electromagnet receives the signal, the iron core will hit the closing scorpion, the constraint of the cam positioning member will be released, and the closing spring will pass the cam and the two sets of four-bar linkage mechanism. The energy is transmitted to the moving conductive rod, so that the moving conductive rod moves upward to realize the switch closing. At the same time, the opening dice will buckle the arm on the main shaft to make the switch in the closing state; the lever will switch the auxiliary switch, cut off the closing circuit, open the opening circuit, and the circuit breaker is closed. During the closing process, the contact pressure spring and the opening spring are stored, ready for the opening, and the closing of the closing button can release the constraint of the cam positioning member, thereby making the circuit breaker closing process In the closed state, when the opening electromagnet receives the opening signal, the iron core will hit the opening dice and make it trip. Under the action of the opening spring and the contact pressure spring, the main rotating shaft rotates in the opposite direction, which drives the conductive rod to move downward to realize the opening of the circuit breaker. If the manual opening is directly pressed, the opening button can be released, and the circuit breaker can be opened. It should be noted that if the trolley is to be pushed or removed, the circuit breaker must first be opened; after the trolley is pushed into position, the handle of the interlocking lever is lowered to the lowest position, and then the circuit breaker can be closed; 3 the handle of the interlocking lever is at the highest position. When it is between the lowest position and the lowest position, the circuit breaker cannot perform the opening and closing operation. Only when the interlock lever handle is at the lowest position, the circuit breaker can perform normal operation. Several common fault analysis and processing methods Energy storage does not rotate Common causes Control circuit fault Wiring error Motor damage. The travel switch is burnt. The connecting rod of the rod is too long, the cam is not over, and the closing is unsuccessful; the over-shock-proof gasket installed on the lower box is installed too much, the rotation angle after the spindle is rotated is not enough, and the brake is not closed; Adjusted too high, and immediately slipped after closing (closed can not hold) e. Contact pressure spring compression is too large (overtravel too large). If the closing interlocking lever is too long or too high, the closing scorpion and the cam roller cannot be unlocked; the hanging spring opening pin on the mast collides with the closing coil yoke, and the closing action is not in place. Concluding remarks The introduction of foreign AC traction equipment for Beijing Fu Ba Line subway vehicles was independently designed and assembled by domestic factories and achieved great success. This paper preliminarily analyzes the performance and principle of its transmission system. To carry out localization research, it is necessary to conduct more in-depth analysis and research, and do some specific component trial work. In short, these tasks will bring benefits to the localization of the equipment and other urban design and introduction of subway vehicles and their equipment. It is necessary to convert the pulse mode and reduce the carrier frequency ratio (the number of rectangular pulses in the half-wave period during pulse width modulation) However, if the carrier frequency ratio is continuously reduced, the inverter output voltage waveform and its phase will change, and it is difficult to ensure the symmetrical relationship between the three-phase outputs, resulting in unstable operation of the motor. Therefore, a control method in which the carrier frequency ratio is reduced in stages as the inverter output 0 carrier frequency is increased in frequency is adopted. In determining the carrier frequency ratio, factors such as the switching speed of the GTO component, the switching loss, the peak output current formed when the GTO is turned off, and the suppression of the generation of even harmonics are considered. The determination and conversion of the inverter carrier frequency ratio is as shown in FIG. In the figure, fch is the chopping frequency of the GTO component, fi is the inverter output frequency, and fs is the slip frequency.
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