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How to realize axial positioning control of motor products?
source：未知 time：2024-05-29 10:19nbsp; click：
During the operation of the motor, the most ideal state is for the stator and rotor cores to be axially aligned to ensure that the effective iron length is maximized; however, in actual situations, components will expand due to heat generated by the operation of the motor, so it is necessary to follow the actual conditions of the motor. The structure determines the moving end and the stop end, leaving the necessary axial clearance; in addition to normal thermal deformation, the stator and rotor cores are not aligned properly, and the magnetic pull during motor operation causes the motor rotor to move axially. , the direct consequence of this problem is misalignment of the stator and rotor, causing axial force on the bearing.
When the three-phase symmetrical current flows through the three-phase winding of the stator, a rotating magnetic field is generated in the motor. The clockwise rotation of the magnetic field is equivalent to the counterclockwise cutting of the rotor cage bars against the magnetic induction lines, thus generating induced electromotive force and induced current in the rotor cage bars. Since the rotor current is generated not by energization but by induction, it is called a three-phase induction motor.
The direction of the magnetic force exerted on the rotor cage bars can be determined from Ampere's law. The rotor will also rotate clockwise under the action of this electromagnetic torque, that is, the rotation of the rotor is consistent with the rotation of the rotating magnetic field. The speed of the rotor is related to the load on the rotor shaft, but the speed of the rotor must always be smaller than the speed of the rotating magnetic field, otherwise it will slow down under the action of resistance torque due to not being affected by the electromagnetic torque; therefore, the three-phase induction motor is also called a three-phase motor. Induction motor.
Since the rotation of the rotor is consistent with the rotation of the rotating magnetic field, and the rotation of the rotating magnetic field is determined by the phase sequence of the current, when the two power lines are exchanged, the rotation of the rotating magnetic field will be reversed due to the change of the phase sequence of the current, so the rotation of the rotor will also be Reverse. It can be seen that the three-phase induction motor can easily change the rotation direction of the rotor shaft by arbitrarily exchanging the two power lines.
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