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Relationship between torque and power of permanent magnet DC motor

2016-07-12 12:00:55 来源: 永磁直流电机_博山直流电机厂-淄博市博山广联电机厂 Hits: 2485 2016-07-12 12:00:55 Source: Permanent Magnet DC Motor_Boshan DC Motor Factory-Zibo Boshan Guanglian Motor Factory

The power of the permanent magnet DC motor should be selected according to the power required by the production machinery, and the motor should be operated under extra load as much as possible. Pay attention to the following two points when selecting: ① If the motor power is too small. The appearance of a "small horse cart" will form a long-term overload of the motor. Make its insulation damaged by heat. Even the motor was burned. ② If the motor power is too large. The appearance of "Big Marathon Trolley" will appear. The output mechanical power cannot be fully utilized, and the power factor and power are not high, which is not only obscure to users and the power grid. And also waste of electricity. To accurately select the power of the motor, it is necessary to pass the following calculations or comparisons: P = F * V / 1000 (P = Calculated power KW, F = Required tension N, Work machine linear speed M / S) For continuous operation of stable load , You can calculate the power of the required motor by the following formula: P1 (kw): P = P / n1n2 where n1 is the power of the production machine; n2 is the power of the motor, that is, the transmission power. The power P1 obtained by the above formula is not necessarily the same as the commercial power. thus. The extra power of the selected motor should be equal to or slightly greater than the calculated power. In addition. The most common method is to select the power of the motor by analogy. The so-called analogy. It is compared with the power of the motor used in similar production machinery. The specific method is: understand how much power is used by similar production machinery of this unit or other nearby units, and then select a nearby power motor for test run. The purpose of the test run is to verify that the selected motor matches the production machine. The verification method is: make the motor unit move to produce mechanical operation, measure the working current of the motor with a clamp ammeter, and compare the measured current with the extra current marked on the motor nameplate. If the actual working current of the electric power machine is not significantly different from the extra current marked on the spleen. It indicates that the power of the selected motor is appropriate. If the actual operating current of the motor is 70% lower than the extra current marked on the nameplate. It indicates that the power of the motor is too large, and the motor with a smaller power should be interchanged. If the measured motor operating current is more than 40% greater than the extra current marked on the nameplate. It indicates that the power of the motor is too small, and the motor with a larger power should be interchanged. In practice, you should think about torque (torque). Motor power and torque have accounting formulas. That is T = 9550P / n where: P—power, kW; n—excessive speed of the motor, r / min; T—torque, Nm. The output torque of the motor must be greater than the torque required by the work machine, usually a safety factor is required. The derivation of the relationship between power, torque, and speed is as follows: Power = Force * Speed P = F * V --- Formula 1 Torque (T) = Torque (F) * Effect Radius (R) ----- -Introduce F = T / R --- Formula 2 Linear speed (V) = 2πR * Rotational speed per second (n seconds) = 2πR * Rotational speed per minute (n minutes) / 60 = πR * n minutes / 30 --- Formula 3 Substitute formulas 2 and 3 into formula 1 to get: P = F * V = T / R * πR * n minutes / 30 = π / 30 * T * n minutes ----- P = power unit W, T = turn Moment unit Nm, n minutes = unit of rotation speed per minute per minute. If the unit of P is changed to KW, then it is the following formula: P * 1000 = π / 30 * T * n 30000 / π * P = T * n 30000 /3.1415926*P=T*n 9549.297 * P = T * n This is why there is a 9550 coefficient connection between power and torque * speed. . . It is suitable for the connection and mutual conduction between the additional power, additional speed and additional torque of the servo motor, but the actual additional torque value should be measured in practice. Due to the question of energy conversion power, the fundamental value is generally the same and will be slim Decrease

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