How to choose a motor for gear pumps used in high-altitude areas

When selecting gear pump motors in high-altitude areas, it is necessary to comprehensively consider the impact of high-altitude environments on factors such as heat dissipation, insulation, and power output. The following are systematic selection suggestions:

1、 The impact of high-altitude environment on motors

1.  Decreased heat dissipation efficiency

-The thin air reduces the heat dissipation capacity and increases the temperature rise of the motor. It is necessary to adjust the cooling method (such as forced air cooling, water cooling) or choose a motor with a higher heat dissipation level.

2.  Decreased insulation performance

-Low air pressure may cause corona discharge, and motors with Class F or Class H insulation should be selected, ensuring that the insulation material's voltage resistance meets high-altitude standards.

3.  Power attenuation

-Ordinary motors need to be downgraded when the altitude is greater than 1000m (with a power reduction of about 1% for every 100m increase). It is recommended to choose  high-altitude dedicated motors * * or reserve 10-20% power margin.

2、 Key points for matching gear pumps

1.  Cavitation risk

-Liquid is prone to vaporization under low pressure, and the effective cavitation head (NPSHa) of the pump needs to be recalculated. If necessary, reduce the speed or increase the suction pressure.

2.  Medium and viscosity

-The viscosity of lubricating oil increases in low-temperature environments, and it is necessary to verify the starting torque to ensure that the motor can overcome resistance.

3、 Key parameters for motor selection

1.  Power adjustment

-Calculate the actual required power according to the altitude correction formula:

\(P_ {\ text{plateau}}=P_ {\ text{standard}} \ times (1+\ frac {\ text{altitude} {10000}) \)

Or choose a motor with a higher power level directly.

2.  Cooling method

-Priority should be given to motors with  IC416 (forced air cooling)  or  IC411 (water cooling) cooling structure.

3. Starting torque

-Ensure that the starting torque of the motor is ≥ 150% of the maximum starting load of the gear pump, and if necessary, choose a high torque motor or soft start device.

4.  Protection level

-The plateau is prone to sandstorms, and it is recommended to have a protection level of ≥  IP54  and strengthen the sealing.

4、 Other precautions

1. Voltage stability

-The plateau power grid fluctuates greatly, and a voltage regulator can be installed or a wide voltage motor (such as 380V ± 15%) can be selected.

2.  Material adaptability

-Avoid using brittle materials in low-temperature environments, and use low-temperature lubricating grease for motor bearings.

3. Testing and Certification

-Select motors that have passed high-altitude certification (such as GB/T 20626.1) and conduct temperature rise tests under actual operating conditions.

5、 Recommended plan

- Motor type : High altitude dedicated variable frequency motor (such as Y2-H series)

- Power margin : 15-20% higher than standard requirements

- Insulation level : F level or above

-Cooling method: forced air cooling (IC416)

-Protection level: IP55  

- Supporting measures : Install air pressure compensation device or frequency converter to adjust the speed.

Summary

The selection of motors in high-altitude areas should focus on heat dissipation enhancement, power margin, and insulation upgrade, while also considering the cavitation protection and starting requirements of gear pumps. It is recommended to have in-depth communication with the motor manufacturer,

Provide specific parameters such as altitude, temperature, and medium for customized design, and regularly monitor temperature rise and vibration after installation to ensure stable system operation.