Phase asynchronous motor quality appraisal

-phase asynchronous motor is based on the core principle of electromagnetic induction and mechanical transmission synergy. By optimizing efficiency, power factor and temperature rise control, it achieves synergy of rated power output, starting performance and operating stability. It is widely used in industrial pumps, fans, compressors and conveying equipment. In heavy-load start-up scenarios, it is used for the high torque requirements of crushers/ball mills; in variable frequency control, it meets the energy-saving operation of precise speed regulation; in high-temperature environments, it ensures the heat aging resistance of insulation materials. Compared with ordinary motors, high-efficiency phase asynchronous motors have the characteristics of low-loss silicon steel sheets, high-purity copper windings and intelligent protection (overload/phase loss/overheating warning), and are the core unit of industrial power systems.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide phase asynchronous motor quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for phase asynchronous motor quality appraisal.

With the upgrade of energy efficiency standards, related quality dispute cases have increased significantly. The judicial dispute focuses on:

1, performance index dispute: efficiency is not up to standard, power factor is insufficient;

2, material defects: silicon steel sheet iron loss exceeds standard, enameled wire insulation layer thickness is uneven;

3, process problems: rotor cast aluminum porosity, bearing chamber coaxiality deviation;

4, contract performance dispute: core configuration (such as imported bearing brand, frequency conversion compatibility) does not match the technical agreement.

For the quality appraisal of phase asynchronous motors, the commonly used technical methods are as follows:

1. Appearance inspection: Check whether the appearance of the motor is intact and whether there are any defects such as damage, deformation, rust, etc.

2. Measure electrical parameters: measure the stator winding DC resistance, insulation resistance, winding insulation grade, rated voltage, rated current and other electrical parameters of the motor, and compare them with the nameplate data.

3. Mechanical performance test: measure the output power, speed, efficiency, power factor, starting torque, vibration and noise of the motor and other mechanical performance indicators.

4. Temperature rise test: simulate the actual working conditions of the motor, measure the temperature rise of the motor, and compare it with the standard value.

A water pump factory of the applicant signed an "IE3 High Efficiency Motor Procurement Contract" with a motor manufacturer of the respondent, agreeing that the efficiency is ≥94%. After being put into production, the measured efficiency of the electric meter was only 90%. The manufacturer argued that it was caused by harmonics in the power grid.

identification and analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site investigation case materials and other data of "phase asynchronous motor" , made the following quality analysis opinions:

The silicon steel sheet of the phase asynchronous motor involved in the case has an iron loss of 3.2W/kg (agreement ≤ 2.5W/kg), the rotor cast aluminum porosity is 8%, and the winding DC resistance deviation is +6% (agreement ±3%), resulting in a 15% increase in copper loss.

The appraisal conclusion concluded that material and workmanship defects were the main cause of insufficient energy efficiency.

-phase asynchronous motor quality appraisal report should include:

1, purpose of appraisal (such as attribution of energy efficiency disputes, safety compliance verification) and reference standards;

2, motor model involved, energy efficiency label, production batch;

3, testing method and equipment clearance Single (such as electrical parameter analyzer, metallographic microscope);

4, detection data and failure correlation analysis (such as the impact of iron loss on efficiency);