How to solve the problem of excessive no-load current of the motor?

The rated current of the motor is the corresponding current under the rated load of the motor; the no-load current of the motor refers to the minimum current required by the motor without load; the size of the no-load current directly affects the efficiency and service life of the motor.

From the analysis of the operating structure of the motor, the main function of the no-load current of the asynchronous motor is excitation, so the no-load current accounts for a large proportion of the rated current. For permanent magnet synchronous motors, because no excitation is required, the no-load current is small. a lot of. Based on this principle, rotor permanent magnetization remanufacturing technology has been well applied.

In order to basically determine the quality status of the motor, the no-load current is often used to make a basic determination. During the factory test of the motor, the no-load current measurement is a very important inspection item. Any deviation from the standard may have some non-compliance factors. .

Whether the no-load current is large or small, there should be a benchmark data for comparison, that is, the design value of the motor. From a theoretical analysis, if the manufacturing process is carried out completely according to the design, the no-load current will not deviate too much. Once there is a large deviation, , must be a pathological condition relative to the design. Therefore, large no-load current is treated as a fault treatment during the test phase of the motor.

When the stator and rotor cores of the motor are not aligned, the effective iron length of the stator or rotor is insufficient, or the air gap between the stator and the rotor is large, the no-load current will be too large. Some of these problems can be solved through size correction. Some can only accompany the motor for a lifetime.

From the analysis of the correlation between motor performance, no-load current is a necessary parameter for motor operation, but larger no-load current will lead to low efficiency of the motor, and some even directly affect the temperature rise level of the motor.

Solving the problem of large no-load current of the motor requires a series of systematic steps. Here are some suggestions:

1. Check the mechanical system:

Bearings and mechanical connecting parts: Check whether the bearings are well lubricated to reduce friction. Make sure the mechanical connecting parts are not stuck.

Alignment of mechanical components: Ensure that the mechanical components of the motor are aligned to avoid additional mechanical resistance.

2. Review of motor design and manufacturing:

Winding and core design: Check whether the winding and core design of the motor meet the requirements. The motor structure may need to be redesigned or modified.

Winding connection: Check whether the winding connection is firm and there is no short circuit or poor contact.

3. Evaluation of power system:

Power supply voltage stability: Check the voltage fluctuation of the power supply. If the fluctuation is large, consider installing a voltage stabilizer.

·Power supply phase balance: Ensure the phase balance of the power supply to prevent the motor from running unevenly on different phases.

4. Control system adjustment:

Magnetic field control: Optimize the magnetic field control system to ensure that the adjustment of magnetic flux is stable under no-load condition.

Current control: Adjust the current control system to ensure that the current remains at normal levels at no load.

5. Fault diagnosis and monitoring system:

Sensor installation: Install current, voltage, temperature sensors, etc. to monitor the motor operating status in real time.

Fault diagnosis system: Deploy a system that can automatically detect and report abnormalities in motor operation.

6. Overmagnetization protection:

Over-magnetization detection: For possible over-magnetization problems, install an over-magnetization protection device to ensure that the magnetic flux will not be too large when no load is applied.

7. Motor load adaptability:

Motor speed regulation: If possible, consider adjusting the motor speed at no-load to reduce no-load current.

Load matching: Ensure that the motor load matches the designed load to prevent the motor from excessively absorbing current under light load conditions.

8. Professional technical support:

Motor expert consultation: Ask a motor expert to conduct a comprehensive assessment of the system, find out the exact cause of the problem, and provide a professional solution.

·Motor manufacturer contact: If the motor was purchased, contact the manufacturer for support and advice.

9. System stability test:

Load test: Carry out system load test to ensure that the motor can operate normally under various load conditions without abnormal current draw.

10. Regular maintenance:

Maintenance plan: Develop a regular maintenance plan, including lubrication, cleaning, mechanical component inspection, etc., to ensure the reliability and stability of the motor system.

When performing the above steps, it is recommended to check step by step, starting with simple problem troubleshooting first, and then gradually delving into complex system parts. It is best to have these steps performed by a professional electrical engineer or repair team to ensure that the problem is accurately resolved.

We,Germana Tianjin Industrial Group is a leading supplier of all kinds of high quality & efficiency electric motors in China for more than 35 years. If you have any requirements of electric motors,we encourage you to reach out to our sales team via email for any inquiries or to discuss potential business collaborations. And our sales team is delighted to serve as your advisors in the field of electric motors, ready to answer any questions you may have about various motor types. Our sales team members are always ready to assist you:

General Manager - Li Gui Lai

Email: [email protected]

Overseas Sales Manager - Li Shu Yue

Email: [email protected]

We are looking forward to the opportunity of working with you and establishing a successful partnership. Thank you for your interest in Germana Tianjin Industrial Group, and we hope to hear from you soon.

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