Sliding noise rated working voltage

When the brush slides on the resistor, the voltage between the center end of the potentiometer and the fixed end has irregular fluctuations. This fluctuation is called the sliding noise of the potentiometer. It is caused by the uneven distribution of the resistivity of the material and the electric Irregular changes in contact resistance when the brush slides.

Rated working voltage

Rated working voltage refers to the highest working voltage allowed by the potentiometer under the specified conditions. The actual working voltage of the potentiometer should be less than the rated voltage.

Resolution

Resolution refers to the ratio of the change in resistance to the output voltage when the resistance of the potentiometer changes continuously. The resolution of the non-wire wound potentiometer is higher than that of the wire wound potentiometer.

Dynamic noise

Dynamic noise refers to the electrical noise generated when the potentiometer’s moving contact slides on the resistor under the action of an applied voltage. The magnitude of this noise is related to the speed of the shaft, the contact resistance between the contact point and the resistor, the number of moving contacts, the uneven change in the resistivity of the resistor, and the magnitude of the applied voltage.

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Semiconductor and Texas Instruments

Investors interested in the semiconductor industry often find themselves weighing the interests of Texas Instruments (NASDAQ: TXN) and NXp Semiconductors (NASDAQ: NXpI). The two huge chip manufacturers have a lot in common, there is fierce competition in several key markets, and they run very similar hybrid manufacturing models. So, which is a better investment now?

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Once upon a time, the main determinant of these two stocks was their valuation. Last spring, NXp ’s trading price was a bargaining ratio of 10 times forward earnings, which made it a unique investment strategy. At the time, Texas Instruments (TI) stock was changing hands at 20 times forward earnings. For p / E purists, there is no reason to consider TI as NXp.

Since then, the situation has changed, but perhaps the rules of the game have not changed. NXp investors achieved a 74% return in 2019, while TI shareholders had to settle with 36% (still market leading) earnings. Today, NXp stocks have a price-to-earnings ratio of 15 times and free cash flow of 24 times, while Texas Instruments’ (TI) valuation ratio is 26 times forward earnings and 39 times free cash flow.

Therefore, NXp does seem to be worth the money right now, but that is not all. The chief investor Warren Buffett famously favored buying large companies at a reasonable price rather than buying fair companies at high prices. This is a wonderful way to think about the important issues of serious investors.

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The development of permanent magnet synchronous motor

The cooling method of the motor has gradually developed from natural cooling to water cooling. At present, domestic electric motor companies mainly use water cooling, and foreign advanced electric motor companies have developed to oil-cooled motors. Some domestic motor companies have also developed oil-cooled motors, such as Jingjin, etc., to further improve the cooling efficiency of the motor.

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The development bottleneck of permanent magnet synchronous motor

At present, because pure electric passenger cars use permanent magnet synchronous motors as the main technical route, how to further improve their performance has become a key issue in the industry. At present, permanent magnet synchronous motors are facing technical difficulties in the following aspects:

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power density

There are two ways to increase the power, one is to increase the torque, and the other is to increase the speed. The former’s main problem is the increase of overload current, which causes high heat generation and great pressure on heat dissipation; the latter is high ferromagnetic loss at high speed, which requires the use of high-performance low-saturation silicon steel sheets, which increases the cost; Structure, but affects power density.

Material

permanent magnet materials are also an important factor restricting the performance improvement of permanent magnet synchronous motors. At present, the commonly used permanent magnet materials NdFeB mainly have the disadvantages of poor temperature stability, irreversible loss and high temperature coefficient, and severe magnetic performance loss at high temperatures, which affects the motor performance.

production process

The difficulty in the production process of permanent magnet synchronous motors is an important factor restricting large-scale supporting passenger cars. Due to the lack of industrialization accumulation of permanent magnet synchronous motor manufacturers, domestic companies have a high production defect rate and cannot meet the defect rate requirements of passenger car companies. Annual production has brought huge challenges to permanent magnet synchronous motors.

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網頁設計如何便於優化

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孩子,你的成長要趕得上我老去的速度

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小時候的我們也非常渴望得到父輩們的疼愛。那時候沒有校車的接送,學校就在距離家裏五公裏的地方,每天都要背上裝滿書本的書包獨自走到學校。剛開始哭天喊地特別不習慣,直到後來發現這種方式沒有任何效果時,才猛然發覺,好像有些事情,真的就這么開始了,只能一個人去完成,一個人去承擔。這個過程很可能還需要忍受孤獨,寂寞,得不到鮮花,也獲得不了掌聲。

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