The meaning of 8023

What does negative logarithm mean?

If lgx = - A, the - a power of x = 10

What do you mean by logarithm of order?

The number of pole pairs of permanent magnet motor refers to the number of pairs of permanent magnet rotor (or stator)
N. S pole. The number of poles is the total number of N and S poles
Number of poles = number of poles / 2, so 10 poles is 5 pairs of poles
If the number of poles is unknown, the method to determine the number of poles is as follows
(1) If the rated frequency f (Hz), rated speed n (RPM) on the nameplate
It is known that the polar logarithm can be calculated by 60 * f / n
(2) Connect a certain frequency of alternating current, measure the motor speed, and then use the rotating speed
The relationship between velocity and frequency is 60 * f / n
Driven by frequency conversion controller, the speed and frequency can be read out
(3) Rotate the permanent magnet rotor for one circle, observe its back EMF, and see how many
A cycle is its polar logarithm

How to understand the number of poles of a motor,

For example, a 2-pole motor is a pair of magnetic poles, and the number of poles is 1; a 4-pole motor is two pairs of magnetic poles, and the number of poles is 2, and so on! Its relationship with the rotating magnetic field speed is: rotating magnetic field speed = 50 * 60 / number of poles
For example: 4-pole motor, rotating field speed = 50 * 60 / 2 = 1500 (RPM), the actual speed is slightly lower, generally around 1450

How to divide the magic clone into sections

What is cloning: trace back to the word "cloning" and introduce what "cloning" is: before and after the birth of Carassius auratus: about: before and after the birth of Carassius auratus ", and briefly explain the cloning experiment. Dolly sheep: describe the birth process of Dolly sheep in detail, and reveal the great significance of the success of cloning sheep and the huge

If the sign (x) denotes the largest integer not greater than the rational number x, {y} denotes the remainder of the integer y divided by 3, the value of (- 3 × 7) - {14} is calculated

Let's look at {y}
Because {y} is the remainder of the integer y divided by 3
14 divided by 3 = 4
therefore
{14}=2
Then look at (x)
Because (x) denotes the largest integer not greater than the rational number X
(-3 x 7)=(-21)=-21
last
(-3×7）-{14}=-21-2=-23
The answer must be right
I hope it can help you
You can keep asking me if you don't know

Simple calculation of 7.6 times 99 plus 7.6, recursive equation

7.6×99+7.6
=7.6×（99+1）
=7.6×100
=760

Shanghai Science and Technology Press seven mathematical numbers chapter one real numbers all exercise answers

If you write it yourself, you should do a lot of questions now
Why wait for the answer?

For a commodity, first raise the price by 1 / 5, and then reduce the price by 1 / 5. The current price is equal to 1 / 5 of the original price

24/25

Given that the function f (x) whose domain is r satisfies f (f (x) - x2 + x) = f (x) - x2 + X. (I) if f (2) = 3, find f (1)
If f (x) = x and f (2) = 3 in the question, then it's not a function?

F [f (x) - x ^ 2 + x] = f (x) - x ^ 2 + X, not necessarily f (x) = x, because the range of F (x) - x ^ 2 + X is not necessarily R
Therefore, only in the range of F (x) - x ^ 2 + X, can f (x) = X
F (2) = 3, and Ming 2 are not in the range of F (x) - x ^ 2 + X
If f [f (x) - x ^ 2 + x] = f (x) - x ^ 2 + X, x = 2, then f [f (2) - 4 + 2] = f (1) = f (2) - 4 + 2 = 3-2 = 1
That is, f (1) = 1

The meaning of 8023