The rotor spins freely when not under tension, which means it does not hold the shaft when under tension, the rotor is stuck and buzzing, this which should be the phase shift inside the motorThere is a problem or wear in the carbon brush positionA serious poor contact has caused the rotor coil to not shift phase (stuck). When phase switching is not possible, only the winding of the current phase is connected, and the current in the wire package is unbalanced, so there will be a buzzing sound, which is the sound of resonance of the wire package .
A motor refers to an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. The motor is represented by the letter M (D in the old standard) in the circuit. Its main function is to generate engine torque as a source of energy for theelectrical appliances or various machines. The generator is represented by the letter G in the circuit. Its main function is to convert mechanical energy into electrical energy.
Water pump motor selection
should be selected according to the shaft power; the motor power is one level higher than the shaft power; for example: the shaft power is 15 kW; the selected motor should be: 18.5 kW As for the number of poles to use, the motor should be based on actual working conditions. Bipolar motors are generally used when the head is slightly high and the flow rate is not large (the calculation is more complicated). When the flow rate is large and the head small, a 4-pole motor can be selected. For ultra-high flow and low lift, choose a 4 or 6 pole motor. When a six-pole motor is selected, the ppower can be reduced by one level depending on the power of the shaft.