磁轴承电感传感器无功补偿技术

doi:10.19799/j.cnki.2095-4239.2021.0249

摘要/Abstract

摘要：

电感位移传感器由于其灵敏度高、线性度好、成本低等特点而被广泛应用于磁轴承转子位置的测量。电感传感器的灵敏度通常与功率正相关。为获得较高的灵敏度，需要提升功率，尤其对于恒磁通轴向电感位移传感器应用，这对功率运放提出了很高的要求。提出了一种用于电感传感器的无功补偿技术，可在不影响传感器灵敏度的前提下，在传感器的使用频率范围内(20～40 kHz)，将功率放大器的输出视在功率降低70%以上，降低了对功率放大器的最大输出功率要求。评估了补偿电容精度对补偿效果的影响，证明了无功补偿对补偿电容容值精度要求不高，具有工程实用价值。

关键词: 电磁轴承, 电感传感器, 无功补偿

Abstract:

Inductive displacement sensors are widely used to measure magnetic bearing rotor position because of their high sensitivity, good linearity, and low cost. The sensitivity of inductive sensors is typically positively correlated with power consumption. Power improvement is necessary to obtain high sensitivity, particularly for applying the constant flux axial inductive displacement sensor, which requires high power amplifiers. Accordingly, finding a way to reduce the total power of the sensor without changing its sensitivity will help reduce hardware costs. In this paper, a reactive power compensation technology for the inductive sensors of magnetic bearings is proposed. By paralleling appropriate capacitors at both ends of the excitation coils of the sensor, the study was able to realize a parallel resonance state, thereby greatly reducing the reactive power of the entire circuit. The experimental results showed that, without affecting the sensors' sensitivity, the power amplifier's apparent output power could be reduced by more than 70% at 20～40 kHz. This reduced the maximum output power requirement of the power amplifiers. Following that, the influence of compensation point selection on the compensation effect was tested. The results showed that the compensation point selection demand was very low. Finally, the influence of compensation capacitance precision on the compensation effect was evaluated. The results indicated that reactive compensation did not require high compensation capacitance precision, and the 10% precision capacitor could achieve a satisfactory power optimization effect. Parallel reactive power compensation could significantly reduce the total apparent power of the sensors and the cost of power amplifiers. This technology presents practical value in the field of engineering.

Key words: magnetic bearing, inductive sensor, reactive power compensation

中图分类号:

TP 212.1

王纯一, 张剀, 徐旸. 磁轴承电感传感器无功补偿技术[J]. 储能科学与技术, 2021, 10(5): 1650-1655.

Chunyi WANG, Kai ZHANG, Yang XU. Reactive power compensation technology for the inductive sensors of magnetic bearings[J]. Energy Storage Science and Technology, 2021, 10(5): 1650-1655.

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频率/kHz	补偿电容/nF	补偿前干路电流/A	补偿前视在功率/W	补偿后干路电流/A	补偿后视在功率/W	功率降低比例/%
20	1466	4.44	15.76	0.84	2.94	81
30	669	3.64	15.11	0.80	3.32	78
40	409	3.20	15.04	0.84	3.99	73

频率/kHz	补偿电容/nF	补偿前灵敏度/(mV·μm^-1)	补偿后灵敏度/(mV·μm^-1)	灵敏度变化率/%
20	1466	1.807	1.834	1.5
30	669	2.257	2.286	1.3
40	409	2.450	2.477	1.1

轴向位移/mm	最佳补偿电容/nF	实际补偿电容/nF
0	331	333
3.50	362	364
5.00	389	386
6.50	411	409
9.00	428	427

补偿电容/nF	相对最佳补偿电容的电容值误差/%	平衡位置处干路电流有效值/A	相比未补偿时干路电流减少比例/%	传感器工作范围内干路电流有效值变化/A
0	—	1.240	0	1.180～1.294
333	-14.4	0.249	80	0.227～0.276
364	-6.4	0.233	81	0.233～0.242
386	-0.8	0.251	80	0.239～0.273
409	+5.1	0.300	76	0.274～0.336
427	+9.8	0.336	73	0.304～0.379

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