Introduce

YE4P series variable frequency speed regulating low voltage three-phase asynchronous motor

Frame number: H63-355

Capacity: 0.12~450kW

Number of poles: 2~12P

Voltage: 1000v and below

Motor knowledge

    1、In the DC motor, the component that converts the external direct current into the internal alternating current is the commutator. The function of the commutator is to convert DC to AC (or vice versa).

    2、In the synchronous motor, when the stator winding crosslink excitation flux F0 is the maximum value, the back potential E0 reaches the minimum value, when F0 reaches zero, E0 reaches the maximum value, the phase relationship between F0 and E0 is F0 ahead of E0 90o. The relation between E0 and F0 is expressed as follows: E0 = 4.44f NkN1F0.

    3、In the motor, the leakage flux refers to the flux of only the cross-link winding itself, and the back electromotive force generated can often be equivalent with a leakage reactance voltage drop (or negative reactance voltage drop).

    4、asynchronous motor rotor has: – squirrel cage type, winding type and other two.

    5、The slip rate s of the asynchronous motor is defined as the ratio of the difference between the synchronous speed and the rotor speed to the synchronous speed. When the asynchronous motor works in the motor state, its slip rate s ranges from 1>s>0.

    6、Relationship between electromagnetic torque Tem of asynchronous motor and slip rate s TEM-S curve has three key points, respectively, starting point (s= 1), maximum electromagnetic torque point (s=sm), synchronization point (s=0). When the rotor resistance of the induction motor changes, the characteristics of the maximum electromagnetic torque Tem and slip rate sm are: the size does not change, and the position of s changes.

     

    matters need attention

    Compared with other motors, the motor supporting the pump is destined to face some special tests because of the particularity of the environment and load. If the environment of the pump is relatively clean and stable, the negative impact on the motor will be small, if the pump operating environment is poor, it is very likely to lead to accidents during the operation of the motor.

    (1) If the environmental pollution of the pump is serious, it is likely to lead to the overload problem of the motor, the pump for sewage treatment may be due to the presence of mud, debris, etc. in the treated medium, resulting in the pump impeller can not rotate normally, the direct consequence is the increase in the load dragged by the motor, and the problem of overload and even blocking occurs in serious cases, so, It is very necessary to protect the motor overload under such condition.

    (2) The guarantee of the motor protection level is very critical. For most of the motor supporting the pump, the surrounding environment is generally more humid, and some even have pollution, therefore, the protection level of the motor selection and guarantee is crucial; The key parts and materials of the motor must have anti-rust function, especially the parts where the liquid is in direct contact, must be dealt with in place to prevent the occurrence of rust problems.

    (3) Reliability assurance of bearing system. A repair unit to undertake a number of special supporting pump of the vertical motor, the main performance of the fault is concentrated in the bearing system rust and pollution to the winding, after professional inspection and analysis, in the motor bearing system seal and parts to take the necessary measures, thoroughly solve the problem.

    (4) For the submersible motor, its protection, anti-corrosion and explosion-proof requirements will be more stringent, according to the matching structure of the motor and the pump, for the protection level of the motor, electromagnetic wire, etc., there are special requirements and guarantees, such as, some electromagnetic wire directly in contact with the liquid, its insulation performance guarantee is also an important part of the ordinary motor.

    (5) Motor starting control. In the actual application of the pump, starting is an important content, motor starting and water deployment is very critical, the choice of power frequency motor or frequency conversion motor, is also very particular, the user must start the key information and motor designers to fully communicate, to avoid unnecessary trouble.