Quality factors of linear Motors
time£º2017/12/12 click£º8166
We often have to evaluate the "good or bad performance" of some devices. However, "good or bad performance" actually has different uses, different purposes of use, and different requirements for use. Its evaluation will have different conclusions. For an ordinary rotating motor, We often use efficiency, power factor, etc. as an indicator to evaluate the aircraft's "performance", but for the linear motor, especially the force motor, it should have its own measurement index. This is the quality factor proposed by Laisiweite. It is a convenient way to measure the quality of a linear motor. There are several ways to define the quality factor G. For example, a linear induction motor allows the primary troposphere to be
As long as you let <S> / <UNK> T = jws, this troposphere can be converted to the coordinates of the secondary edge, so the sub-surface By can be obtained by the formula
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The ratio of our defined formula(2) is a quality factor because it is the real part of the flux density By and represents the active component of the magnetic field, or the component of the producing force, rather than the reactive force. The quality factor defined in equation(2) and another formula recommended in the references[7]
It's consistent. The tau in equation(3) is the pole moment. According to the equivalent circuit, the quality factor of the secondary is determined to be
Where Xm is the excitation reactance and R2 is the secondary resistance.
In the initial design of a linear motor, the quality factor is a useful indicator. However, for high-speed linear induction Motors, the quality factor is large and it may not be able to obtain peak thrust and efficiency. In this case, we have to make some corrections to the quality factor. Kunshan tongmao Electronics Co., Ltd. has been focusing on the production and research and development of linear motors for ten years. The linear Motors produced by the company adopt advanced European and American technical standards, techniques and testing methods, and their quality and power performance have reached advanced levels, which have been recognized by domestic and foreign customers.
Linear motor