Locked-rotor, overload, phase-loss and free-burning motor of high-efficiency and energy-saving water pump

Abstract

According to the technical scheme provided by the invention, a locked-rotor, overload, phase-loss and free-burning motor of a high-efficiency and energy-saving water pump is provided. The motor comprises a three-phase winding. The motor is characterized in that at least two phases of the three-phase winding are respectively provided with a protector. The protector comprises a movable contact pieceand a static contact piece. The movable contact piece is in contact with the static contact piece when the temperature of the movable contact piece is lower than a preset temperature. The movable contact piece is separated from the static contact piece when the temperature of the movable contact piece is higher than the preset temperature. A movable contact piece binding post is arranged at the tail part of the movable contact piece. A static contact piece binding post is arranged at the tail part of the static contact piece. A heating resistor is connected below the static contact piece in parallel. The heating resistor is insulated and isolated from the static contact piece. The two ends of the heating resistor are connected to the static contact piece binding post and the movable contact piece binding post respectively. The damage phenomenon of the motor is effectively avoided. The protector is low in price and economical in cost.

Description

technical field [0001] The invention relates to a motor for a submersible pump, in particular to a high-efficiency and energy-saving water pump stall, overload, phase-lack and non-burning motor. Background technique [0002] The submersible pump motor often adopts a three-phase asynchronous motor. Its operation is to use three-phase alternating current to pass into the three-phase winding of the motor to generate a rotating magnetic field in the stator cavity. The rotor conductor relatively cuts the magnetic field lines of the magnetic field to generate the rotational motion of the rotor. Make the motor spin up. [0003] In practice, in order to ensure the safe operation of the motor, the motor has short-circuit protection and overload protection devices, so that when a fault occurs, the power supply is automatically cut off to protect the motor and power supply lines. [0004] The existing protector is a contact separation type of dynamic and static contact pieces. When ov...

AI Technical Summary

Problems solved by technology

[0004] The existing protector is a contact separation type of dynamic and static contact pieces. When overload or phase loss occurs, the current increases sharply, and the moving contact piece on the protector is heated and deformed, and is separated from the static contact piece, thereby disconnecting the circuit and stopping the motor. However, after a period of time when the moving contact piece cools down, the moving contact piece resumes its deformation and closes with the static contact piece again, the motor restarts, and the moving contact piece is disconnected from the static contact piece due to heat deformation, so that the start and stop of the motor will be repeated, which cannot solve the problem At the same time, it will do a lot of damage to the motor, and it is easy to burn the motor

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