共查询到17条相似文献,搜索用时 169 毫秒
1.
角速度是旋转系统或传动装置进行状态监测的重要参数。设计了一种新结构、无旋转部件的便携式瞬时角速度传感器。该传感器的工作原理是永磁磁钢建立恒定磁通,被测旋转装置的转动部件切割该恒定磁场后形成涡流,涡流产生的磁场与传感器的霍尔元件相互作用产生霍尔电势,该霍尔电势的幅值与被测旋转装置的角速度成正比。根据磁路的基本定律推导出传感器的输出特性,并对输出特性进行了实际的测定,结果表明:传感器的灵敏度为16.8mV·s/rad,非线性误差为1.24%。 相似文献
2.
研制了一种新型旋转角加速度传感器校准装置。校准装置包括外定子、杯形转子和内定子,其中外定子两相绕组的轴线正交,输入的两相交流电错开90°相位差,产生旋转磁场后驱动杯形转子产生变化的角加速度量值;推导了角加速度量值的理论公式,给出公式所需参数的获取方法;最后采用光栅测角加速度系统对校准装置的特性进行了测定,结果表明装置产生的角加速度量值线性误差约为0.53%。 相似文献
3.
4.
5.
设计了一种复合式罩极电机,为双定子双转子结构,电机运行时定子绕组施加励磁,产生的旋转磁场带动转子旋转。分析了电机气隙磁场的特性,推导了电磁转矩公式,表明电机运行时存在扭转振动。研制了复合式罩极电机样机,利用传感器对电机在不同励磁状态下的转矩输出进行了检测,表明电机运行时存在扭转振动,且扭振幅值随两相励磁电压的相位差而变化,最后对变化规律进行了理论分析,结果表明:扭转振动波的相位差为两相励磁电压相位差的2倍。 相似文献
6.
7.
8.
《中国新技术新产品》2014,(11)
电动机是当前我国工业生产中必不可少的装置,其属于旋转式机器,作用是将电能转换为机械能。电动机的结构主要有定子绕组以及一个转子或者旋转电枢构成,电磁铁绕组的作用是产生磁场,在旋转磁场的作用下,电枢铝矿中便会有电流通过,由于受到磁场的作用,因而其会产生转动。而运行中的电动机会受到外界环境以及人为因素而产生多种故障,对于电动机所产生的故障,可以通过四种方式进行预防和判断,即看、听、闻、摸,在判定故障后,及时的将故障排除以保证电动机能够正常运行。 相似文献
9.
旋转式感应同步器是一种高精度的角度检测元件,目前国内已达到±0.5角秒的水平。这种元件由于在恶劣的环境中能可靠地工作,因此在许多精密的随动系统和机床的程序控制中,被作为角度自动测量和主动测量的传感器用。旋转式感应同步器的综合误差包括零位误差和细分误差。理论上定子两相绕组同转子绕组之间的耦合值分别是两圆盘角位置的正弦和余弦函数。但实际上由于耦合函数畸变而产生 相似文献
10.
对影响内置式永磁同步电机转矩特性的三个关键设计参数——永磁体宽度、定子绕组匝数及转子铁心外形进行了研究。以具体样机为例,分析了定子绕组匝数、永磁体充磁方向长度和转子外形对转矩特性的影响。分析结果表明:永磁体宽度接近于整数倍定子齿距可降低负载脉动转矩;采用偏心分段圆弧法优化转子外形有利于提高电机的转矩特性。通过实验验证了理论分析的正确性。 相似文献
11.
The three phase flux reversal machine (FRM) is a doubly salient permanent magnet machine with concentrated windings. This study proposes the distributed winding for this machine. This winding (i.e. full pitch winding) offers high-power density and improves the efficiency. The permanent magnet (PM) flux linking the stator winding has effectively two or four pole flux pattern, which depends on the number of stator poles and independent of number of rotor poles. Finite element method (FEM) analysis is performed on the concentrated stator pole winding FRM (CSPFRM) and proposed full pitch winding FRM (FPFRM) to obtain induced EMF, flux linkages and inductance of the winding. The inductance of both machines is also obtained using winding function approach and compared with FEM results. The effect of armature reaction is compensated by capacitive series compensation to improve the voltage regulation. FEM analysis is also carried out on both the compensated generators to evaluate the power density. Speed of the flux pattern and that of the rotor is different in FRM. The ratio of these two speeds is termed as fictitious 'electrical gear'. FRM and permanent magnet synchronous machine (PMSM) have sinusoidal terminal voltage and surface mounted PMs. The power density of both machines is compared using the concept of fictitious `electrical gear?. To verify the above analysis, a 6/14 pole FRM with distributed and concentrated winding is designed and fabricated. The experimental results are in close agreement with simulated results. 相似文献
12.
13.
The designs of circular cogged magnetoelectric measurement converters of rotation angle into unitary code in which the variable magnetic flux does not pass through a permanent magnet are described. The effect on the error of the measurement of the step error angle of the cogs of the rotor of the converter, the stator of which is provided with separate magnetoconducting cogged sectors, is analyzed.Translated from Izmeritel'naya Tekhnika, No. 1, pp. 30–31, January, 1995. 相似文献
14.
定子永磁型电机具有转子上既无永磁体也无绕组、功率密度高、效率高等优点,因此非常适合在高速下工作。然而由于凸极转子复杂的几何形状,对其强度进行分析只能采用有限元法等数值方法。基于弹性力学理论,建立了凸极转子强度的解析分析模型。分析了凸极转子的载荷分布,在此基础上,基于平面应力模型和应力函数法,推导了定子永磁型电机凸极转子的应力及变形的解析解;用有限元法对解析解的有效性进行了验证;分析了凸极转子的凸极高度及形状对转子强度的影响。结果表明,建立的凸极转子强度解析解在转子应力最大区域内的计算结果与有限元法的计算结果完全吻合,能够对定子永磁型高速电机凸极转子的最大应力进行精确分析,可为定子永磁型高速电机的转子设计提供支持。 相似文献
15.
Improved analytical model for predicting the magnetic fielddistribution in brushless permanent-magnet machines 总被引:2,自引:0,他引:2
A general analytical technique predicts the magnetic field distribution in brushless permanent magnet machines equipped with surface-mounted magnets. It accounts for the effects of both the magnets and the stator windings. The technique is based on two-dimensional models in polar coordinates and solves the governing Laplacian/quasi-Poissonian field equations in the airgap/magnet regions without any assumption regarding the relative recoil permeability of the magnets. The analysis works for both internal and external rotor motor topologies, and either radial or parallel magnetized magnets, as well as for overlapping and nonoverlapping stator windings. The paper validates results of the analytical models by finite-element analyses, for both slotless and slotted motors 相似文献
16.
Quality and resolution of integrated microsystems using Hall sensors dedicated to an angular encoder are strongly dependent on the accuracy of the relative position of Hall sensors and on the offset of electronic front end circuitry. In this paper, we describe a CMOS microsystem built on two integrated circuits. This contactless encoder microsystem gives three sine and square signals with a phase shift of 120/spl deg/ and provides an angular error of less than 4/spl deg/ without external trimming or feedback. The Hall sensor assembly with the engine consists of fixing a small permanent magnet on the rear axis of the motor. Then, the sensor is positioned in front of this magnet. 相似文献