The two motors have the same other parameters, but their rated speeds are lower
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Apart from the difference in speed, all the parameters listed on the nameplates of the two motors are identical. One motor rotates at 1390 revolutions per minute, while the other rotates at 1425 revolutions per minute. Can differences in rotational speed indicate a problem with the quality of the motor?
Does the motor come with an inverter? The speed has nothing to do with the quality of the motor; the quality of a motor is generally determined by its efficiency
That’s possible; the motor can rotate at 2900 revolutions, or 2930 as well
Those with a speed of 1450 revolutions per minute are all 4-pole motors; it’s just that different manufacturers have different requirements, but the speed should be the same.
The speed of the motor has no direct relationship with its mass. The relationship between motor speed and motor power: P = T * n / 9550 (KW), where P is the rated power, T is the rated torque, and n is the rated speed. It can be seen that the speed of the motor affects the magnitude of its output torque; this is not a quality issue
Two motors with different speeds perform work on the same device. The speed level affects the torque level; in this case, which motor will have a longer service life?