·Hubei released the overall plan for the reform of the official car system
The General Office of the Hubei Provincial Party Committee and the General Office of the Provincial Government jointly issued the "Overall Plan for the Reform of the Official Vehicle System in Hubei Province". This marks the implementation of the bus reform in Hubei Province. According to estimates, the number of buses after the car reform in Hubei Province, city and county will be reduced by 51%, and the total annual expenditure on official transportation will be reduced by several hundred million before the car reform. Automatic Common Mode Inductance Winding Machine Common mode inductor winding direction difference? Automatic Common Mode Inductance Winding Machinery, Common Mode Winding Machine, Common Mode Inductance Winding Machine SUZHOU DEGU MACHINERY CO.,LTD , https://www.deguwindingmachine.com
At one time, the number of buses in the province has been reduced by more than half. This aspect shows that the reform of the bus in Hubei has moved, and on the other hand, it shows that the space for bus reform is large. According to figures released by relevant departments in Hubei last year, about 80,000 buses in Hubei with a total value of about 3 billion yuan will be auctioned out. How many buses can be cut in other places?
Hubei has reduced the number of buses by half, which should be a benchmark for bus reform. At present, the stock of Chinese buses is too big. Ye Qing, a member of the Standing Committee of the Political Consultative Conference of Hubei Province and an expert on bus reform, pointed out that at present, the stock of full-caliber buses in China has reached several million. Therefore, the bus reform is by no means a small fight, but should minimize and cancel the bus.
1: Is the winding direction of common mode inductor opposite? This is bullshit. The winding direction of common mode inductors is the same, and the magnetic fluxes of common mode current parameters cancel each other. Therefore, magnetic materials with high permeability can be used to achieve small volume and large inductance without saturation. The interference between the two power lines to the ground is called common mode interference. How does this common mode inductor work when there is no ground wire on my power supply? The so-called common mode current is the current flowing into or out of the LN line at the same time. When testing the conduction, use the artificial LISN network. The relevant knowledge can remind you not to forget the parasitic capacitance of PE.
2: Common mode winding inductance is to wind two windings with the same phase and same number of turns on the same magnetic core. The reverse magnetic field generated by the current will cancel each other, so it will not cause saturation. As for the winding direction you see, I don't know if it is the winding direction. If it is wound on the same side, then the two winding directions are opposite, one clockwise and the other counterclockwise, If it's a different side winding, it's clockwise. So this problem is a little different. It depends on how you define it. No matter how you wind, it's OK to ensure the same phase and number of turns. For the second question, refer to the answer from the upstairs. Generally, the test conduction needs to be connected to the LISN, and output to the load, the load and the product to be tested through the LISN. There is GND access signal on the LISN.
What is the difference between wound inductor and laminated inductor?
Wound inductor is the product of traditional wound inductor miniaturization. Laminated inductor is made by multi-layer printing technology and laminated production process, and its volume is smaller than wound chip inductor.
Winding inductor: it is characterized by a wide range of inductors (MH ~ H), high accuracy of inductor, small loss (i.e. large Q value), large allowable current, strong inheritance, simple manufacturing process and low cost; The disadvantage is that it is limited in further miniaturization. The ceramic core wound chip inductor can maintain a stable inductance and a fairly high Q value at such a high frequency, so it occupies a place in the high frequency circuit.