The particularity of water pump motor
List the characteristics of pump-specific motors in order to reduce the adverse consequences of design blind spots
Pump load introduction
Pump-type dedicated motors have two types of application structure, horizontal and vertical, with three major technical features:
The starting torque is relatively small,
Starts relatively infrequently,
Continuous running time is relatively long.
Generally, pump motors are mostly asynchronous motors or synchronous motors with squirrel-cage rotors. The power of the motor is greater than the shaft power by one level. The number of motor poles used is closely related to the pump head and flow.
If the shaft power is 22kW, choose a 30kW motor; 2-pole motors are generally used when the head is slightly high and the flow is not large; when the flow is large and the head is small, a 4-pole motor can be selected; for large flow and low head, 4 or 6 poles Motor.
Water pump motor connection
According to the scope of application, applicable places, economic factors, etc., there are several ways to connect the pump to the motor:
● The shaft of the pump is directly connected to the motor shaft;
● The shaft of the pump is connected to the motor shaft through a coupling;
● The shaft of the pump is connected to the motor shaft through a reduction box;
● The pump shaft is connected to the motor shaft through a hydraulic coupling.
Load characteristics
The load of the pump motor is related to the pump head and flow. When a high-lift pump works at a high-lift point, its flow is the design point. When working at a low-lift, it is equivalent to reducing the outlet resistance of the pump. At this time, the flow of the centrifugal pump will increase and the pump motor will be overloaded. If it exceeds a certain level, the pump motor will be burned.
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