An Online Adaptive Active Balancing Method of Electric Spindle Considering Air Gap Unbalance
A technology of active balance and electric spindle, applied in static/dynamic balance test, machine/structural component test, instrument, etc., can solve problems such as air gap imbalance, achieve the effect of small rotation frequency vibration and improved capacity
Active Publication Date: 2019-12-13
XIAN UNIV OF SCI & TECH
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Problems solved by technology
[0009] In order to improve the balance ability of the existing self-adaptive influence coefficient method, the purpose of the present invention is to propose an online self-adaptive active balance method for electric spindles considering the unbalanced air gap, so as to solve the problem of high-speed and high-precision motors such as machine tool electric spindles. The technical problem of precision online active balancing, the application of this method can significantly reduce the residual vibration of this type of rotor, ensure the high rotation accuracy of the rotor, and thus ensure the high processing quality of the machine tool
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[0044] The present invention is described in further detail below:
[0045] 1. An online self-adaptive active balancing method of an electric spindle considering air gap imbalance, comprising the following steps:
[0046] 1) Let the mass-diameter products of the balance vectors produced by the active balance mechanism during the kth and k+1th balances be m respectively k+1 、m k , the vibration values of the motorized spindle at one rotation frequency measured at the kth and k+1th balances are respectively u k+1 , u k , p is the real influence coefficient of the electric spindle at a certain speed, then there is the online active balance equation of the electric spindle single-plane influence coefficient method:
[0047]
[0048] 2) When performing online active balancing, the influence coefficient p is obtained through online testing. At this time, the measured influence coefficient is recorded as p k , it is obtained as follows:
[0049]
[0050] 3) Based on the ...
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The invention discloses an electric spindle on-line adaptive active balancing method considering air gap imbalance. The method comprises the steps that an on-line active balance equation of an electric spindle single plane influence coefficient method is established; a gain factor is introduced in the on-line active balance equation of the electric spindle single plane influence coefficient methodto improve the stability of on-line balance; a forgetting factor is introduced to establish an electric spindle single plane on-line adaptive active balance equation based on on-line real-time influence coefficient estimation; and finally, the electric spindle single plane on-line adaptive active balance equation considering the influence of air gap imbalance is established, so that an estimatedinfluence coefficient is accurate. According to the application of the method provided by the invention, residual vibration after rotor balance of an electric spindle can be significantly reduced; thereal-time rotation precision of the rotor of the electric spindle is high; and the processing quality is high.
Description
technical field [0001] The invention relates to the technical field of dynamic balancing of rotating machines, in particular to an online self-adaptive active balancing method for an electric spindle considering air gap imbalance. Background technique [0002] At present, the spindle transmission system of high-end CNC machine tools generally adopts the so-called "zero transmission" electric spindle integrated with the motor and the spindle. The electric spindle eliminates the intermediate transmission link, and the motor rotor directly acts as the spindle of the machine tool, which significantly improves the rotation accuracy of the spindle of the machine tool and enables the development of the machine tool to high speed. [0003] The unbalanced rotor means that the center of mass of the rotor deviates from the center of rotation, which will cause unbalanced inertial centrifugal force when it rotates, thereby arousing the vibration of the electric spindle. The vibration of...
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IPC IPC(8): G01M1/30
CPCG01M1/30
Inventor 樊红卫
Owner XIAN UNIV OF SCI & TECH