The problem of reversing the power of the motor, what is the problem of reversing the power in the g

Hello:— 1. "Due to special circumstances, the impeller in the water flow impact pump drives the motor to rotate"...It is possible to use the "remanence" of the motor to generate electricity.

However, due to the weak magnetic field of the "remanence" and the low rotational speed, the voltage generated is very low (which can be measured with a universal meter).

2. The voltage of using the "remanence" of the motor to generate electricity is very low, "at this time, if the motor circuit contactor is connected to the power transmission" has no effect, and the pump will operate normally after the power is on.

When the motor is completely disconnected from the outside, there will only be a small residual magnetic field, and the power generation voltage is very small, so it can be ignored. The power generation voltage is proportional to the excitation magnet, and the rotational speed only determines the power generation frequency.

The inverter drags the stop of the water pump, there is an energy feedback process, if the parking deceleration time is too short, the inverter may have to report overvoltage. If the pump motor is started in the reverse state, for example, there is no braking in advance, the acceleration time of the inverter is too short, and the parameter adjustment is unreasonable, it is possible that the inverter will report overcurrent.

First of all, you need to understand the two different principles of motor and generator. Motor: Converted from electrical energy to kinetic energy, and the magnetic field generated by electricity makes the rotor rotate; Generator:

Kinetic energy is converted into electrical energy, and the coil moves in a magnetic field to produce electrical energy. Structurally: the motor winding is on the stator, the generator winding is on the rotor, you said one:

The motor rotor has no coils, and the second has no magnetic field. Did you send a call?

In this way, the motor is in a state of power generation, but because the impeller in the water flow impact pump drives the motor to rotate at a low speed, the most important thing is that there is no auxiliary excitation device, the remanence of the rotor can not be enhanced, and the voltage output of the winding is negligible (1V); At this time, if the motor circuit contactor is connected to the power supply, the motor rotates to pump water.

Each diesel engine will be equipped with a load output switch for the customer. The load switch must be disconnected before the generator set starts. Only when the mains power is cut off, when there is no current on the grid, the current of the generator set can be transmitted to the grid.

At this time, it is necessary to ensure that the power grid switch is in a disconnected state, otherwise, when the mains power is called, it is easy to reverse the power transmission phenomenon. What is the phenomenon of reverse power transmission, and what are the consequences of this phenomenon? The situation that the self-provided diesel round oil generator transmits power to the city grid is called reverse power transmission.

There are two serious consequences: 1) If the city grid is not blacked out, the power supply of the city grid and the power supply of the self-provided generator set will be connected at the same time, and the generator set will be destroyed. If the capacity of the self-provided generator set is large, it will also cause the city grid to occur.

2) The city grid has been out of power and is being repaired, if the self-provided generator set is reversed, it will cause the maintenance personnel of the power supply department to be electrocuted.

Therefore, every user who uses diesel generator sets must always abide by the rules of use of diesel generator sets to avoid the occurrence of the above accidents.