Submersible borehole electromotors
Introduction:
Submersible electric motors are generally long and thin and designed to operate in a borehole coupled to a submersible multistage pump. These motors, with multistage pumps attached, are designed to be lowered into a small diameter borehole to pump ground water.
The motors are actually smaller than their dimensional name implies. The Inch dimension actually refers to the ID of the hole not the motor diameter. The motors need to be smaller than the hole to allow water to pass between the motor and the well liner and into the pump.These motors rely on good water flow past the motor. Water flow velocity must be between 0.5 ft/sec. to 10 ft/sec . (15cm/sec to 300 cm/sec). If the flow is less than this the motors will probably overheat and burn out. Surprisingly if the flow is more than this, motors will also overheat because the high velocity does not allow efficient heat transfer from the motor to the water.
These motors are designed for high power outputs in small sizes in comparison with normal air cooled motors. Because water is a very efficient cooling medium, compared with air, the current density in the stator winding is much higher than an air cooled motor. This is acceptable provided the external body of the motor is efficiently cooled be the external water. If there is no external water flow or if the external water ambient temperature is too high the motor will overheat.
Our Products:
The KSB submersible motors, which are the most widely used submersible electric motors in Iran have an output power in the range of 1.5 kW to 300 kW.
The sizes of our electric motors are:
