Servo control is necessary to do the servo motor power calculation. Output power P = 0.1047 * N * T [where N is the rotational speed, T is the torque]
The rotational speed is substantially 3000 rpm. So how to calculate the torque T?
Torque T = r * M * 9.8 [where r is the radius of the shaft and M is the weight of the object]
Motor power, should be based on the power required to produce machinery to choose, try to make the motor under the rated load operation. Selection should pay attention to the following two points: ① If the motor power selected too small, there will be "small horse cart" phenomenon, resulting in long-term overload motor, insulation damage due to heat, or even the motor was burned. ② If the motor power selection is too large, there will be "big horse cart" phenomenon, the output of mechanical power can not be fully utilized, power factor and efficiency are not high, not only for users and power grid, but also cause energy waste .
To correctly select the motor power, the following calculations or comparisons must be made: P = F * V / 1000 (P = calculated power KW, F = required tension N, V = working machine speed M / S)
For a constant load continuous mode of operation, the required motor power can be calculated as follows: P1 (kw): P = P / n1n2 Where n1 is the efficiency of the production machinery; n2 is the efficiency of the motor, that is, transmission efficiency. The power P1 obtained by the above equation is not necessarily the same as the product power. Therefore, the rated power of the selected motor should be equal to or slightly larger than the calculated power.
In addition, the most commonly used analog method to select the motor power. The so-called analogy, is similar to the production machinery used in motor power for comparison. The specific approach is: to understand the unit or other units near the production of similar machinery to use more power motor, and then use the motor of similar power to test. The purpose of the test is to verify that the selected motor and production machinery match.
The verification method is:
So that the motor drive the production of mechanical operation, with a clamp ammeter to measure the motor current, the measured current and the motor nameplate on the rated current is compared.
If the actual working current of the electromotor is not different from the rated current marked on the spleen, it indicates that the power of the selected motor is suitable.
If the actual operating current of the motor is about 70% lower than the rated current indicated on the nameplate, it indicates that the motor power is too large and the motor with smaller power should be replaced.
If the measured motor current rating than the rated current on the nameplate more than 40%, then the motor power is selected too small, should replace the power of the motor.
In fact should be considered torque (torque), motor power and torque calculation formula. T = 9550P / n In the formula: P - power, kW; N - the rated speed of the motor, r / min; T - torque, Nm. The output torque of the motor must be greater than the torque required to work machinery, the general need for a safety factor.
Mechanical power formula: P = TxN / 97500 P: Power unit W T: Torque in g / cm N: Speed in r / min
