Choosing motor, how to selec power and torque?
The power of the motor, should according Micro Gear Motor to the production of mechanical power it needs to choose and make motor running under the rated load. When the choice should be paid attention to the following two points
1) if the motor power to choose too small. Will appear "small mara carts" phenomenon, resulting in motor overload for a long time. Make its insulation damage due to heat. Even the motor was burned down.
(2) if the motor power to choose too large. Would be a "big mara car" phenomenon. The output mechanical power cannot be fully used, the power factor and efficiency is not high, not only bad for users and power grids. But also will cause the waste of electric power.
To correctly selec the power of the motor, must go through the following calculation or comparison:
P = F * V / 1000 (P = computing power KW, required tension N, F = work machine speed M/S)
In addition. Analogy method is the most Low Rpm Electric Motor commonly used to selec the power of the motor. The so-called analogy method. Is compared with similar production machinery used the power of the motor.
Particular way is: to understand the unit or other units near similar production machinery use more high power motor, then choose close to the power of motor for commissioning. The purpose of test is to validate the selected motor mechanical match with production.
Validation of the method is: make the motor driving mechanical operation of the production, the working current of the motor is measured with clip-on ammeter, the measured current and comparing the marked rated current of the Gear Reduction Motor motor nameplate. If the electric work, the working current and inscription of spleen of rated current fluctuation. Indicates the selected motor power. If the motor's actual working current is lower than rated current of the marked brand of the 70% or so. Suggests that the motor power to choose too large, should change the smaller power of motor. If measured motor working current is greater than marked brand of the rated current of more than 40%. Suggests that the motor power to choose too small, should change the power of the larger motor.
Suitable for servo motor rated power, rated speed, and the relationship between the rated torque transconductance, but the actual rated torque value should be actual measured, because of the energy conversion efficiency, broadly in line with a basic value, there will be slight decrease...
Inverter dc motor drive and the development of ac motor drive successively with the birth of the 19th century, it has a history of more than 100 years, and has become the main driver of machinery. However, due to technical reasons, for a long period of time, about 80% of the electric drive system of is not variable speed drive system used in ac motor (including asynchronous motor and synchronous motor), and in the need for speed regulation control system basically adopt the drag of the dc motor.
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