Generator Core

For the star connected motor when the U phase is disconnected the V and W two phase windings are connected in series with the power supply V and W phases When the rated load is constant the U phase current is zero and the current of V and W two...

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An arc shaped connecting part and the first bending part and a second bending part is formed with a cavity the arc arc spell two adjacent block punching the lateral wall of the cavity inner wall after a curved sheet coated before an arc sheet an...

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The magnetic field main magnetic field in the stator core is a DC magnetic field with constant size and direction The flux in the iron core is constant and the induced electromotive force and eddy current are not produced The whole steel is made...

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Electrostatic induction produces shaft voltage where there are more high voltage equipment around the motor running and under the action of strong electric field the shaft voltage is induced at both ends of the shaft External power supply to produce...

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The operation of inverter power supply voltage of the motor shaft when the inverter power supply power supply voltage harmonics due to higher voltage in the pulse component under the action of electromagnetic induction between the stator winding...

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5 regular inspection of the starting equipment to see whether the contact and wiring have burns oxidation good contact and so on 6 insulation inspection The insulation capacity of insulating materials varies depending on the degree of drying so it...

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In the motor shell on drops of 2 3 water if only steaming no sound the motor is not overheating if the water drops sharply vaporization accompanied by hissing sound that the motor is overheated The accurate method to judge whether the motor is...

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The rotor conductor cuts the rotating magnetic field induced electromotive force and current and the rotor current carrying conductor is acted by the electromagnetic force in the magnetic field thus forming the electromagnetic pitch which drives the...

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At present the most commonly used AC motor is mainly AC motor which can be divided into two types 1 three phase asynchronous motor 2 single phase AC motor The first one is widely used in industry while the second is used in civil electric appliances...

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It is also the main electrical equipment motor power consumption accounted for the total generating capacity of 60 70 Another classification is classified according to the structure or the speed of the motor can be divided into transformers and...

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Considering the rotor copper loss and iron loss of asynchronous motor the rotor magnetic field is established The loss model of asynchronous motor in a directed d q coordinate system is studied The relation between motor loss and rotor flux is...

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No matter what kind of efficiency optimization control strategy is adopted the magnetic flux of the motor is all under light load The reduction will inevitably affect the rapidity of torque dynamic response The strategy can only be used for fans...

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Earthing or zero connection protection Protection device for preventing electric shock from touching the casing when the motor shell is charged In short the three phase asynchronous motor phase operation is mainly caused by damage to the motor but...

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Maintenance of common faults of motor 1 motor can not start The motor does not turn and there is no sound The reason is that the power supply or winding has two or three phase open circuit First check whether there is a power supply voltage such as...

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Phase break protection the torque of the motor decreases when the phase is out of phase and the motor must flow or even burn out when the load is constant Therefore the motor phase missing is the corresponding protection must be action to prevent...

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Control and protection of motor 1 start asynchronous motor start method has full pressure start direct start decompression start Full voltage starting refers to the process of adding rated voltage directly to the motor stator winding to start the...

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There is noise in the running of the motor 1 mechanical noise and noise from the bearing may be the fracture of the bearing steel ball 2 electromagnetic noise bad match between rotor and stator Overload or short circuit or single phase grounding is...

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After starting lower than the rated speed after starting buzzing and vibration check whether the stator winding is broken if the three phase current balance there is buzz but not vibration check whether the three phase voltage is too low The no load...

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The asynchronous motor is a multi variable nonlinear strong coupling and time varying parameters of the system it is difficult to use precise mathematical model and vector control system for induction motor in the operation process are often subject...

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The simulation and experimental results show that the new adaptive speed observer and the observer together used in direct torque control system and the space vector modulation technology with direct torque control strategy control system on the...

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