Characteristics of AC series motors
1. What's the matter with the humming sound after the motor is added with the frequency converter?
The humming sound is caused by the frequency converter outputting the waveform carrier frequency. Usually, if the frequency converter you use is a fixed carrier wave, the motor emits a scream at this time, which is very stimulating to the human ear. You can adjust the carrier frequency (the frequency converter). There is this function parameter in the technical manual function table.
The higher the carrier frequency, the quieter the sound, but the higher the carrier frequency, the more likely the motor will heat up. Therefore, the carrier frequency you use should be considered according to the heating program and the sound produced. Generally, it is the most suitable carrier frequency under the rated current when it leaves the factory. Under normal circumstances, you do not need to change it!
If the frequency converter uses a random carrier wave, the humming sound from the motor will be softer, but the sound is generally better than that of a fixed carrier wave. If you don't accept it or you want to run silently, you can adjust the carrier frequency up until you are satisfied.
2. Can the inverter single-phase 220v change into three-phase 380v?
Can't. The inverter itself cannot boost, let alone change from single-phase 220v to three-phase 380v. This is theoretically possible, step up the single phase 220v to 380v with a transformer, and then convert the single phase 380v to three phase 380v.
3. Two capacitor starting methods of the motor
1) Capacitor starting (referring to the capacitor disconnection after the motor starts)
2) The capacitor starts and runs (meaning that the capacitor is responsible for both starting and running)
4. The belt driven by the high-power motor has a reducer connected to the motor, and the function of the reducer here
1) Decelerate the speed and increase the output torque at the same time. The torque output ratio is multiplied by the motor output multiplied by the reduction ratio, but be careful not to exceed the rated torque of the reduction box.
2) Deceleration reduces the inertia of the load at the same time, and the reduction of inertia is the square of the reduction ratio. You can look at the general motor has an inertia data.
5. The reason for the slow speed of the motor when starting
If only the speed is slow when starting, it is normal after starting. It may be that the starting capacitor does not match, or the motor design is like this (according to the site design), or the starting time is too long due to factors such as excessive load resistance.
that is all about Characteristics of AC series motors.
