To operate a three-phase motor under the power supply of a single-phase power supply, it is only necessary to add a phase-shifting capacitor. Although the efficiency will be reduced compared to three-phase operation, this method is feasible in emergency situations.
The method of changing the three-phase motor to single-phase operation is as follows:
For a star-connected motor, the wiring method is shown in Figure 1. For a delta-connected motor, the wiring method is shown in Figure 2.
According to practice, the capacity of the phase shift capacitor should be approximately equal to the product of 0.07 and the motor power. For example, if the motor power is 150 watts, the capacity of the selected capacitor should be approximately 0.07 x 150 = 10.5 microfarads, using two 4.75μF capacitors in parallel Can meet the requirements.
If the motor starts quickly and a large hum is heard, the capacitor capacity should be reduced; if the motor starts slowly, the capacitor capacity can be increased appropriately. If the power line is changed from point a to point b, the direction of the motor can be changed.
Vacuum fluorescent display, referred to as VFD, is a low-energy electroluminescent display devices, the working principle and CRT similar. It has the incomparable advantage of liquid crystal display (LCD) in applications where there is a large variation in ambient brightness and no strict requirement for low power consumption, and is now widely used in audio-visual equipment, home electronics, automotive instruments, office equipment and instrumentation.
The structure of a VFD board is a typical vacuum triode structure, consisting of a cathode, a grid and an anode. In between the cathode and the anode there's a thin mesh of metal called the Grid that can be switched on or off, controlling the flow of electrons from the cathode to the anode. This VFD grid mesh is made of a thin metal plate with a thickness of 30 to 50μm, which is lithographed and made into a highly transparent fine lattice or tortoise-shaped metal mesh. When a positive voltage is applied to the grid, electrons emitted from the filament are accelerated and diffused toward the anode. When a negative voltage is applied to the grid, electron flow to the anode is cut off.
We custom VFD Grid with drawings provided by customers. The raw material we use for etched VFD Grid is SUS430 stainless steel. We are equipped with professional metal etching equipment and exposure development equipment. Our etched manufacturing capacity can achieve 0.05mm.
Vacuum Fluorescent Display Grid,VFD Grid,Custom VFD Grid,Etched VFD Grid,VFD Grid Mesh
SHAOXING HUALI ELECTRONICS CO., LTD. , https://www.cnsxhuali.com