How to calculate torque of motor?
The calculation formula for rotational torque is:
T=9550 * P/n
Among them, T is the rotational torque, in Newton meters; P is the rated output power of the motor, in kilowatts; N is the rated speed of the motor, in revolutions per minute. This formula is obtained by converting the units of power and speed, and can calculate the rotational torque based on the output power and speed of the motor.
In addition, the rotational torque can also be measured through experimental methods. In the experiment, the motor is connected to a dynamometer, and the motor is rotated at different speeds by adjusting its load. The output power and torque of the motor are measured. Through these measurement data, the torque speed curve of the motor can be plotted, thereby obtaining the mechanical characteristics of the motor.
It should be noted that the rotational torque is related to factors such as the type, structure, and material of the motor, so different motors have different torque speed curves. In practical applications, it is necessary to determine the appropriate rotational torque based on the characteristics and load conditions of the motor to ensure that the motor can operate normally and achieve the expected performance indicators.
In addition to calculation formulas, there are also some factors worth considering that affect the rotational torque. The following are some main factors:
Speed and power of the motor: The torque output by the motor is related to the speed and power of the motor.
P=T* ω (Power=torque * angular velocity)
T=9550P/n This formula is commonly used in engineering: torque; Power; The calculation formula for the relationship between rotational speed and other factors.
In the formula: T – torque (unit: N.M) 9550- treat it as a constant (do not investigate its source) P – motor power (unit: KW)
N – Output speed (in revolutions per minute)
The origin of constant 9550: The work completed by T is the work output by the motor.
Taking squirrel cage asynchronous motors as an example (excluding variable frequency motors):
When the frequency is below 50Hz, the motor torque changes proportionally to the current;
When the frequency reaches 50Hz, the motor reaches the rated power and rated torque;
When the frequency is greater than 50Hz, the torque and current vary inversely.
Load conditions: The load conditions of a motor have a significant impact on its rotational torque. For example, when the load driven by the motor is a frictional load or an inertial load, its rotational torque will be greatly affected. Therefore, when selecting a motor, it is necessary to choose the appropriate motor type and specifications based on the load conditions.
Motor pole number: The number of poles in a motor is related to its speed and rotational torque. The more poles there are, the lower the speed of the motor, but the rotational torque will correspondingly increase. Therefore, when selecting a motor, it is necessary to choose the appropriate number of poles according to the working needs.
Transmission mode: The transmission mode of the motor also affects its rotational torque. For example, when using transmission methods such as belt or chain transmission, the rotational torque will be affected by the loss and resistance of the transmission mechanism, thereby reducing transmission efficiency. Therefore, when choosing a motor, it is necessary to consider using appropriate transmission methods to improve transmission efficiency.
Motor installation method: The installation method of the motor also affects its rotational torque. For example, compared to horizontally installed motors, the rotational torque of a vertically installed motor may differ due to the influence of gravity. Therefore, when selecting a motor, it is necessary to consider adopting a suitable installation method to improve the performance of the motor.
In summary, rotational torque is one of the important indicators of motor performance, which is influenced by various factors. In practical applications, it is necessary to choose the appropriate motor type and specifications based on the specific working environment and load conditions to ensure that the motor can work normally and achieve the expected performance indicators.
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