阅读说明：本技术 一种ct转子静平衡方法 (CT rotor static balance method ) 是由 潘险峰 王瑶法 马兴江 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种CT转子静平衡方法,包括如下步骤：(1)驱动器速度模式下,控制CT转子以4-6rpm的低速匀速旋转；(2)速度稳定后,采集电机电流反馈信号及转子角度位置反馈信号；(3)识别电流波形中的波峰值Imax,波谷值Imin,及波峰值对应的转子角度值α；(4)计算扭矩幅值T=Kt*[(0.5*(Imax+Imin)-Imax],Kt为电机常数；(5)计算不平衡量m=T/(g*r)；r为配重半径,θ=α+90°为配重角度。本发明CT转子静平衡方法,能够自动识别不平衡量大小、位置；不需要额外仪器,操作简单,效率高；不受人为因素影响,能排除非不平衡量因素干扰,精度高。(The invention discloses a static balancing method of a CT rotor, which comprises the following steps of (1) controlling the CT rotor to rotate at a low speed of 4-6rpm in a driver speed mode, (2) collecting a motor current feedback signal and a rotor angle position feedback signal after the speed is stabilized, (3) identifying a wave peak value Imax, a wave trough value Imin a current waveform and a rotor angle value α corresponding to the wave peak value, (4) calculating a torque amplitude T = Kt [ (0.5 Imax + Imin) -Imax ], Kt is a motor constant, (5) calculating an unbalance amount m = T/(g r), r is a counterweight radius, and theta = α +90 degrees is a counterweight angle.)

1. A static balancing method of a CT rotor is characterized by comprising the following steps:

(1) under the speed mode of a driver, controlling the CT rotor to rotate at a low speed of 4-6rpm at a uniform speed;

(2) after the speed is stable, collecting a motor current feedback signal and a rotor angle position feedback signal;

(3) identifying a wave crest value Imax, a wave trough value Imin and a rotor angle value α corresponding to the wave crest value in the current waveform;

(4) calculating a torque magnitude T = Kt [ (0.5 (Imax + Imin) -Imax ], Kt being a motor constant;

(5) calculating the unbalance m = T/(g r), wherein r is the radius of the counterweight, and theta = α +90 degrees is the angle of the counterweight;

(6) and (4) termination judgment: if the unbalance amount m r is smaller than the allowable unbalance amount, ending; otherwise, stopping rotation, adding a balancing weight with mass m at the radius of r and the angle of theta, or decomposing an equivalent vector to add weights in two fixed weight directions, and then returning to the step (1).

2. The CT rotor static balancing method of claim 1, wherein: the CT rotor in the step (1) rotates at a constant speed of 5 rpm.

Technical Field

The invention relates to the technical field of tomography medical instruments, in particular to a static balance method of a CT rotor.

Background

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a static balance method of a CT rotor, which can automatically identify the size and the position of the unbalance; no extra instrument is needed, the operation is simple, and the efficiency is high; the method is not influenced by human factors, can eliminate the interference of non-unbalance factors and has high precision.

In order to achieve the purpose, the invention provides the following technical scheme: a static balancing method of a CT rotor comprises the following steps:

(1) under the speed mode of a driver, controlling the CT rotor to rotate at a low speed of 4-6rpm at a uniform speed;

(2) after the speed is stable, collecting a motor current feedback signal and a rotor angle position feedback signal;

(3) identifying a wave crest value Imax, a wave trough value Imin and a rotor angle value α corresponding to the wave crest value in the current waveform;

(4) calculating a torque magnitude T = Kt [ (0.5 (Imax + Imin) -Imax ], Kt being a motor constant;

(5) calculating the unbalance m = T/(g r), wherein r is the radius of the counterweight, and theta = α +90 degrees is the angle of the counterweight;

(6) and (4) termination judgment: if the unbalance amount m r is smaller than the allowable unbalance amount, ending; otherwise, stopping rotation, adding a balancing weight with mass m at the radius of r and the angle of theta, or decomposing an equivalent vector to add weights in two fixed weight directions, and then returning to the step (1).

Further, the uniform rotation speed of the CT rotor in the step (1) is 5 rpm.

In conclusion, the CT rotor static balance method can automatically identify the size and the position of the unbalance amount; no extra instrument is needed, the operation is simple, and the efficiency is high; the method is not influenced by human factors, can eliminate the interference of non-unbalance factors and has high precision.

Drawings

FIG. 1 is a flow chart of the process control of the present invention;

FIG. 2 is a graph of current phase angle in an embodiment of the present invention.

Detailed Description

An embodiment of a static balancing method for a CT rotor according to the present invention is further described with reference to fig. 1.

A static balancing method of a CT rotor comprises the following steps:

(1) under the speed mode of a driver, controlling the CT rotor to rotate at a low speed of 4-6rpm at a uniform speed;

(2) after the speed is stable, collecting a motor current feedback signal and a rotor angle position feedback signal;

(3) identifying a wave crest value Imax, a wave trough value Imin and a rotor angle value α corresponding to the wave crest value in the current waveform;

(4) calculating a torque magnitude T = Kt [ (0.5 (Imax + Imin) -Imax ], Kt being a motor constant;

(5) calculating the unbalance m = T/(g r), wherein r is the radius of the counterweight, and theta = α +90 degrees is the angle of the counterweight;

(6) and (4) termination judgment: if the unbalance amount m r is smaller than the allowable unbalance amount, ending; otherwise, stopping rotation, adding a balancing weight with mass m at the radius of r and the angle of theta, or decomposing an equivalent vector to add weights in two fixed weight directions, and then returning to the step (1).

In this embodiment, preferably, the uniform rotation speed of the CT rotor in step (1) is 5 rpm.