The working principle of the rotary motor of the excavator

Completely, fully and efficiently convert the input energy into thermal energy, i.e., all the input energy is converted as a "loss" into an effective thermal energy output.

There are many types of rotary motors. According to its role is divided into generators and motors, according to the nature of the voltage is divided into DC motors and AC motors, according to its structure is divided into synchronous motors and asynchronous motors. Asynchronous motor according to the number of different phases, can be divided into three-phase asynchronous motor and single-phase asynchronous motor; according to the different rotor structure, and is divided into cage and winding rotor type, which cage three-phase asynchronous motor because of its simple structure, easy to manufacture, inexpensive, reliable operation, in a variety of motors in the widest range of applications, the greatest demand.

Extended information:

1, in the same voltage level of electrical equipment, the insulation of rotating motors, the lowest level of impact withstand voltage.

2, the protection of rotating motors with lightning arrester residual voltage and motor shock withstand voltage value is very close to the insulation margin is very small. Such as the generator's factory impact withstand voltage test value than the zinc oxide arrester 3kA residual voltage value is only 25% to 30% higher, magnetic blowing arrester margin is even smaller, and insulation margin with the generator operation will be even lower. Therefore, the motor only rely on lightning arrester protection is not enough, but also must be combined with capacitors, reactors, cable segments, etc. for protection.

3, turn-to-turn insulation requirements intrusion wave steepness is strictly limited. Because the motor winding turn capacitance is very small and discontinuous, forcing the overvoltage wave into the motor winding can only spread along the winding conductor, and it is the length of each turn of the winding is much larger than the transformer winding, the role of overvoltage in the neighboring turns with the steepness of the intrusion wave is directly proportional to the steepness. In order to protect the motor turn-to-turn insulation, must strictly limit the intrusion wave steepness.

In short, the lightning protection of rotating motors, high requirements, difficulties, the need for comprehensive consideration of the winding of the main insulation, turn-to-turn insulation and neutral insulation protection requirements.

Baidu Encyclopedia-Rotating Motors