6 major reasons why micro pump brushless motors burn out

6 major reasons why micro pump brushless motors burn out

We have compared the benefits of brushless motors before. Although they have excellent performance and outstanding advantages compared to brushes, some problems will still occur if the operation is not standardized. For example, performing the following operations will cause the motor to burn out, so special attention is required.

1. Voltage input that does not meet the requirements causes the motor to burn out

Motor input voltage requirements: 12V±10%; 24V±5%.

The positive and negative poles are connected reversely, which directly breaks down the internal components; the power supply voltage is unstable, and the overload capacity of the power supply is limited and cannot withstand the impulse current at the moment when the motor starts; static electricity from the outside world; interference from other electronic devices in the circuit to the power supply.

2. Irregular wiring

The motor signal line is wired incorrectly, and the input control signal and control method do not meet the requirements; hot plugging and unplugging when hot, and the connector is not reliable.

3. Too high ambient temperature

Excessive ambient temperature causes damage to motor electronic components.

4. Collision

The motor is affected by external forces, causing the internal components to become dislocated. After being powered on, the motor cannot operate normally, causing the motor to burn out.

5. The ambient humidity is too high

The ambient humidity is too high or liquid has invaded the inside of the motor, causing a short circuit in the motor control circuit.

6. Triggering protection too frequently

The generator protection function is triggered too frequently, resulting in damage to the protection circuit.

Measures to deal with excessive micro pump power consumption

1.The rotating parts are seized.

Elimination measures: Check whether the clearance of internal worn parts is normal.

2.The shaft is bent.

Elimination measures: straighten the shaft or replace it as required.

3.The speed is too high.

Elimination measures: Check the winding voltage of the motor or the steam pressure delivered to the turbine.

4.The water head is lower than the rated value. Too much fluid is being pumped.

Elimination measures: Consult the manufacturer. Install the throttle valve.

5.The liquid is heavier than expected.

Elimination measures: Check specific gravity and viscosity.

6.The stuffing box is not properly stuffed (not enough stuffing, not stuffed or run-in properly, stuffing is too tight).

Elimination measures: Check the stuffing and refill the stuffing box.

7.Incorrect bearing lubrication or bearing wear.

Elimination measures: Check and replace as required.

8.Incorrect running clearance between wear rings.

Elimination measures: Check whether the gap is correct. Replace the micro pump casing wear rings as required.

9.The stress on the pipes on the micro pump casing is too great.

Elimination measures: Eliminate the stress and consult the manufacturer’s representative. After stress relief, check alignment.

The motor is overloaded and the motor current exceeds its allowable value.

Bending deformation of the micro pump shaft, actual operating parameters exceeding the design parameter range of the micro pump (such as ultra-large flow operation), friction in rotating parts, etc. are all causes of motor overload operation. Checking and correcting the micro pump shaft, using valve control to make the operating parameters within the micro pump’s allowable parameter range, or disassembling the micro pump body to eliminate friction are the keys to solving the problem.

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