1400 rpm 0.25 HP Single Phase Squirrel Cage Electric Motor with Reduction Gearbox
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Product Description
| Model |
HP |
KW |
Currnet |
Speed |
Eff |
Power Factor |
Tn |
Tmax/In |
Tst/Tn |
| ML-632-4 |
1/4 |
0.18 |
1.54A |
1360 |
56% |
0.91 |
1.26 |
1.6 |
2.5 |
Company Profile
FAQ
Determination method of motor inspection test assessment standard
Qualified Zone Act
Based on the model test data of the prototype, it is obtained by using the motor principle and mathematical calculation method. The calculation will use the technical condition limit value of the motor and the prototype test value, and calculate the assessment range limit value according to the 100% tolerance. This method is used. Known as the "Qualified Zone Act". In theory, the qualified area method has higher control accuracy. Because there is no relevant document to clarify the calculation method, many motor manufacturers do not calculate and judge according to this method; however, this method is still used for older motor enterprises.
Upper and lower limit method
According to the test data and assessment standards of the qualified prototype, the maximum and minimum limit values of each test data of the inspection test are given, or the allowable fluctuation range. It becomes a single value "upper and lower limit method". Compared with the upper and lower limit method and the qualified area method, the control accuracy is poor, but the calculation and use are relatively simple, and most new motor manufacturers use this method.
Whether it is the upper and lower limit method or the qualified area method, the basic basis is the type test results of the prototype and the corresponding technical conditions of the product. Due to differences in materials and processes, the mass-produced products will more or less deviate from the prototype test data. , especially when the test data tolerance of the prototype exceeds 50%, the assessment range determined with reference to the data will be largely unreasonable. From the perspective of qualitative performance determination, the author still prefers the qualified area method, but most companies lack empirical calculation formulas.
Principles and steps for formulating assessment standards
(1) Count and summarize the type test data of qualified prototypes as much as possible, and calculate the average value and fluctuation range (maximum and minimum value) of various related items.
(2) For the no-load current, if the power factor corresponding to the above maximum value has reached the minimum limit of the assessment, the maximum value is the maximum limit of the no-load current in the factory standard.
No-load current can be set without minimum limit. If it is considered necessary (for example, to prevent the use of the wrong rotor or the air gap is too small to cause sweeping), the minimum no-load current value of the above statistics can be relaxed (for example, 3-5%) as the minimum no-load current in the factory standard. limit.
(3) Only the highest limit can be set for no-load loss. Considering that this value is greatly affected by factors such as operating time and test environment (mainly ambient temperature) in a simple factory test, it can be increased by about 10% on the basis of the maximum value of the above prototype data.
If the ex-factory test is higher than the given maximum value, the running time of the motor should be appropriately extended to obtain a relatively stable no-load loss before comparing and determining. Another problem is that many motor factories do not have a fan during the inspection and test, but the prototype that the assessment data refers to is the test with a fan, which requires consideration of this factor when determining the no-load loss standard.
(4) The influence of the test environmental conditions on the values of stall current and stall loss is small, so the control range of the upper and lower limit values should be given in strict accordance with the fluctuation statistics of the prototype. If the calculation is based on the statistical average value of the prototype, it is recommended that the deviation between the stall current and the statistical average of the prototype is plus or minus 5%; the deviation between the stall loss and the statistical average of the prototype is plus or minus 10%.
The above is the method for determining the assessment standards for ordinary squirrel-cage rotor motors. There are some differences between different series of products due to the inconsistency of the assessment performance indicators. We will gradually introduce the content in this regard.
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