Is the starting current the same for an electric motor when it starts under no load and when it starts under load?
Thread Content
Is the starting current the same for an electric motor when it starts under no load and when it starts under load?
An engineer is like a pencil: it’s sharp at first, becomes smoother with use, and breaks if it can’t take the strain. So don’t complain about everything you go through; learn to endure and to persevere, and you’ll be able to create beautiful scenes on a blank page!
In the case of AC asynchronous motors, the maximum starting current is the same whether the motor is running under no load or under load; the only difference lies in the duration of the starting current and the current level during normal operation. When starting with either no load or a load, the slip between the rotor’s rotating magnetic field and the stator’s rotating magnetic field is the same, and therefore the current is also the same in such cases. The speed increases rapidly when the motor is running under no load, and this process takes less time; whereas the speed increases more slowly when the motor is under load, and it takes longer for the speed to rise.
Does it refer to the difference between the minimum opening angle of the guide vanes and an actual opening angle when the motor starts? ~~Of course, the guide vanes must have a minimum opening limit; otherwise, when the motor starts and compression begins, the current will definitely be extremely high. However, modern starting processes require certain conditions to be met, such as the guide vane opening being less than 3, otherwise starting is not possible~~
I’m a bit confused. Theoretically, the starting current of an electric motor is related only to the motor’s structural parameters; this should refer to the maximum starting current when the slip rate is 1 at the beginning. But after two cycles, is the current under load higher than that when the motor is running without a load?
This question can really leave you speechless~~~ Is it faster for a horse to pull an empty cart, or to pull a load weighing 1000 pounds?
These electrical devices generate a lot of heat; how do people usually deal with that? It seems that just adding heat sinks and fans isn’t enough… Someone suggested replacing the internal components with S-type thermal conductive materials; I’ve never used them before, so I’m not sure if they’ll work Please ask an expert to let me know
It’s best to have air conditioning to cool down in summer and dehumidify in winter~~
It’s best to have air conditioning to cool down in summer and dehumidify in winter~~
For AC motors, the current under load at startup is the same as that under no-load conditions at the rated voltage, both being 4-7 times the rated current. The difference lies in the process time.