How to calculate the rotational force of the driving wheel
1. The calculation of the circumferential force of the belt pulley
first use the conversion ratio of the belt pulley speed and the belt pulley diameter, speed ratio = output speed: input speed = pitch circle diameter of the load belt pulley: pitch circle diameter of the motor belt pulley. The circular force and the reference force are the same, diameter - 2H = pitch circle diameter, h is the groove depth on the reference line, different types of V-belt h are different, yzab CDE, the circular force on the reference line are h = 1.62 2.753.54.88.19.6 respectively
2. Calculation of belt pulley radial force:
the radial force is the theoretical force of belt pulley pitch line position, which is generally expressed by PD, and the outer circle is generally expressed by OD. The conversion formula of pitch circle and outer circle is different for different groove types. Generally, it is easy to measure the outer circle of pulley, and calculate pitch circle according to the formula. SPZ:OD=PD+4; SPA:OD=PD+5.5; SPB:OD=PD+7; SPC:OD=PD+9.6
The axial force of the pulley is set as D1, N1 for the diameter and speed of the motor pulley (driving pulley) and D2, N2 for the diameter and speed of the driven pulley; That is, D2 = D1 * (N1 / N2). The minimum outer diameter of pulley a or spa is 80mm, SPZ belt, and the small pulley is not less than 63mmextended data:
the recommended degree of pulley groove angle for different types of pulleys in different diameter ranges
1. The recommended degree of pulley groove angle for O-type pulleys is 34 degrees when the pulley diameter ranges from 50 mm to 71 mm; 36 degrees in the range of 71mm to 90mm, & gt; It is 38 degrees at 90mm
2. The diameter of A-type pulley is 34 degrees when the pulley diameter ranges from 71mm to 100mm, and 36 degrees when the pulley diameter ranges from 100mm to 125mm& gt; 38 degrees at 125 mm; When the diameter of B-type pulley ranges from 125mm to 160mm, it is 34 degrees; 36 degrees at 160 MM-200 mm, & gt; When 200 mm, it is 38 degrees
3. C-type pulley is 34 degrees when the pulley diameter ranges from 200 mm to 250 mm and 36 degrees when the pulley diameter ranges from 250 mm to 315 mm; 38 degrees at 315 mm
When the diameter of D-type pulley is 355mm-450mm, it is 36 degrees; At 450 mm, it is 38 degrees; E type is 36 degrees from 500mm to 630mm; It is 38 degrees when 630mmif the axial friction is not taken into account, he can rotate at a constant speed by giving him an impulse
if uniform angular acceleration rotation is needed, the Formula M = J can be used β， M is the torque applied, j is the moment of inertia of the wheel, β It's the angular acceleration of the wheel
I don't know how to ask.
because the direction of friction is opposite to the relative movement trend of the object,
when the driving wheel (i.e. driven by the chain) moves, the lowest point of the wheel contacts the ground. This point moves backward relative to the ground,
so the friction from the ground to the rear wheel moves forward,
the driven wheel itself will not move spontaneously, Because the rear wheel moves, the whole car body must move forward (including the front wheel that will not move spontaneously) because the ground will not move, then the front wheel moves forward relative to the ground
so the friction of the ground to the front wheel is backward,
the friction of both wheels is rolling friction
The method is as follows:
1440 * small pulley diameter = 220 * large pulley diameter. Just work out the equation. Again, you need to determine the diameter of one pulley before you can calculate the size of the other pulley. You can also increase the radius of the pulley to the original 6.5454 ~ ~ multiple of the following cycle, that is, you can multiply the radius of the pulley by this number, and finally it is about equal to
For example, the diameter of the main pulley is 300 mm, the rotation speed is 2000 rpm, and the rotation speed of the driven pulley is 800 rpm. How to calculate the diameter of the driven pulley The method of
is as follows:
300 multiplied by 2000 and divided by 800 is the diameter. In fact, strictly speaking, we need to convert it into circumference, that is, first multiply by 3.14, and then divide by 3.14. Here we just simplify it, and the result is correct. The formula is Π D Χ Speed a ÷ ∏ Χ Speed B is the circumference of the main pulley multiplied by the speed, which is the total length of the belt driven by the main pulley. It is equal to the total length of the driven pulley. So dividing by the speed of the driven pulley is the circumference of the driven pulley, and dividing by the PI is the diameter of the driven pulley
the torque calculation formula is t = 9550p / n. Where p is power, unit is kW, n is speed, unit is R / min, and torque unit is nm.
change the above formula, P = TN / 9550.
P1 = P2, that is, t1n1 / 9550 = t2n2 / 9550, that is, T1 / T2 = N2 / N1
if the diameter of one pulley is 10 and one pulley is 30, then T1 / T2 = N2 / N1 = D1 / D2 = 1 / 3
if the gear transmission ratio is 20:1, then T1 / T2 = N2 / N1 = 1 / I = 1 / 20, where I is the transmission ratio
in addition, this topic is about torque. If it is converted into force, use the formula t = f * L. f is force and l is arm of force
it is too general to know that the force of motor is not enough
you'd better find a book on mechanical design to supplement your basic knowledge.
t is torque in nm
P is the power in kW
n is the rotational speed in R / min
voltage is the rated voltage of the motor. If the voltage decreases, the slip increases, and the current begins to increase to maintain a new balance.