The motor consists of a magnet, an iron core around the coil, a commutator, and a brush? Write before I write, or the problem will be closed

The motor consists of a magnet, an iron core around the coil, a commutator, and a brush? Write before I write, or the problem will be closed

Change the direction of the current

What is the function of commutator and brush in DC motor?

The function of commutator is to connect the current and change the direction of the current. The function of brush is the sliding contact of the motor (except squirrel cage motor) to conduct the current. In DC motor, it also undertakes the task of commutating (rectifying) the alternating electromotive force induced in the armature winding

How does the DC motor commutator work with the brush to change the current

The commutator and rotor of DC motor are on the same shaft. The commutator is insulated copper ring. The brush does not move. The brush is respectively connected with the positive and negative poles of DC. When the motor rotates, the commutator and brush contact can automatically change the current direction
The rotor of practical motor uses many groups of coils. Therefore, there are many groups of commutators. The commutators are also made on the rotor shaft

How to calculate the weight and area of a steel plate 6 meters long, 1.5 meters wide and 6 mm thick?

Volume = L * w * H = 6 * 1.5 * 0.006 = 0.054m ^ 3,
Weight = volume * density = 0.054 * 7.8 * 10 ^ 6 = 421200g = 421.2kg,
Area? Which area? Requirements are not clear, rectangular area = length * width

After converting a circle into a rectangle, the circumference of the rectangle is 6 cm longer than that of the circle. What's the original area of the circle? Thank you,

The radius of the circle is 6 / 2 = 3cm, and the area of the circle is π * 3 * 3 = 9 π≈ 28.26 square cm

It is known that the parabola y = ax & # 178; + BX + C passes through three points: (- 1, - 1), (0, - 2), (1,1)
It is known that the parabola y = ax & # 178;; + BX + C passes through three points: (- 1, - 1), (0, - 2), (1,1)
(1) Find the relation of quadratic function corresponding to this parabola
(2) Write its opening direction, symmetry axis and vertex coordinates
(3) Does this function have a maximum or a minimum? What is the value?

(1) Taking three known points into parabola expression, the equations are obtained
a-b+c=-1…… ①
c=-2…… ②
a+b+c=1…… ③ A = 2, B = 1 and C = - 2 are obtained from the solution of (1), 2 and 3
So the relation of quadratic function corresponding to this parabola is y = 2x & # 178; + X-2
(2) A > 0, opening direction upward, axis of symmetry x = - B / 2A = - 1 / 4, vertex coordinates (- 1 / 4, - 17 / 8)
(3) Y = 2x & # 178; + X-2 = > y = 2 (x + 1 / 4) &# 178; - 2-1 / 8. The opening of this function is upward and has a small value, which is - 17 / 8

How many liters is a cubic meter of diesel

1 cubic meter = 1000 liters
1 cubic decimeter = 1 liter
1 cc = 0.001 L

How to find the remainder of a polynomial divided by a monomial?

Is it similar to factorization? It is difficult to use short division, for example: F (x) = x43x2-2x-2 factorization, a root is x = 1, so the algorithm of dividing f (x) by X-1 is as follows:
Step 1: write down the coefficient by descending power: 103 - 2 - 2
Step 2: move the highest order 1 down and multiply 1 by 1 to get 1 below 0: 103 - 2 - 2
one
one
Step 3: 0 + 1 to get 1, multiply by 1, move to below 3, and so on
Finally, at the bottom, there is a row of numbers 1, 4, 20
It looks like this:
1 0 3 -2 -2
1 1 4 2
1 1 4 2 0
The final result is X3 + x2 + 4x + 2

Green's formula for calculating curve integral
Calculate the curve integral I = ∫∫∫ XLN (x ^ 2 + y ^ 2-1) + YLN (x ^ 2 + y ^ 2-1) dy, where the curve is a straight line from a (0, √ 2) to B (1,1)

I = ∫ XLN (x ^ 2 + y ^ 2-1) DX + YLN (x ^ 2 + y ^ 2-1) dy because PDY - QDX = 0, the integral has nothing to do with the path. Take the path as an arc with the center of the circle (0,0) and radius r = √ 2, x = RCOs [t] = √ 2cos [t] y = rsin [t] = √ 2Sin [t], where t from [0, PI / 4] I = √ 2cos [t] ln (1) d

The rate of advance between two adjacent volume units is 1000,

That's right