To achieve 360 degree rotary position sensing _ industrial business network model Holzer effect sensor（新型霍尔效应传感器实现360°旋转位置传感_工控商务网）

To achieve 360 degree rotary position sensing _ industrial business network model Holzer effect sensor（新型霍尔效应传感器实现360°旋转位置传感_工控商务网） To achieve 360 degree rotary position sensing _ industrial business network model Holzer effect sensor(新型霍尔效应传 感器实现360?旋转位置传感_工控商务网) To achieve 360 degree rotary position sensing _ industrial business network model Holzer effect sensor The filtered advertising | | my account login registration | I want | inquiry shopping cart | online customer service Hello! Welcome to industrial control business network, where there are the most complete and latest automated products for you to buy. Home shopping mall, product category, brand area, product selection, project proposal, technical support, industry information search, information products [search] Senior all products contained 17% VAT industry dynamic | new express | electrician special | product guide | download | training | application case | Abstract | technology use and maintenance of | | journal dynamic show the current position: Home > > > > > > abstract information technology industry The new Holzer effect sensor achieves 360 degree rotation position sensing 2007-01-23 source: Western industrial network browser: 120, a new type of Holzer sensor, single point induction magnetic flux, all three components. VINCENT M. HILIGSMANN, MELEXIS MICROELECTRONIC SYSTEMS An integrated magnetic field concentrator (IMC) is added to the Holzer effect sensor to achieve a high accuracy of 360 degrees Rotating position sensing. Three axis Holzer technology combines integrated magnetic concentrator with high accuracy, non-contact, high performance price ratio, and small rotating position sensors. Melexis MLX90316 Is the first three axis series of products, aimed at solving long-term problems of 360 degrees position sensing. Working principle The ordinary horizontal (planar) Holzer sensor can only induce magnetic flux perpendicular to the surface of the IC. The three axis Holzer sensor is capable of sensing all three components of magnetic flux at a single point. In fact, the method is a cross shape, two pairs of flat Holzer film, placed at the center of a diameter of 200 m, 25 m IMC thick, play a sensing role is the Holzer film (Figure 1A). Figure 1. three axis Holzer sensor (A) top view shows IMC (yellow) and Holzer (blue) plane. Along the three axis sensor, an axial cross section (B) shows the IMC and plane Holzer plates and the magnetic lines of force. IMC is an amorphous material, which is deposited on wafers by photolithography and etching techniques in the post processing process. IMC will be parallel to the surface of the chip volume flux (B / /) into orthogonal components (B group), a component of the induction by the following Holzer (Figure 1B). IMC The material is not saturated, and this transformation is linear. When the parallel magnetic flux is greater than 70mT, saturation occurs, but the saturation of the material will affect the linearity of the sensor, but it is not reversible. When the flux returns to normal range, the linearity is restored. IMC No hysteresis. Each pair of Holzer slices is directly IMC structured to measure its magnetic flux. After each pair of Holzer signals is extracted, the quadrature component of the magnetic flux (B, Z) can be compensated, leaving the parallel components (i.e., B, X, and B Y) ). Increasing the signal can eliminate the horizontal component; only the quadrature component is induced. In this way, a simple operation can measure all three components of the magnetic flux. This is the three axis Holzer name. Three axis Holzer device operation As a non-contact position sensor IC, the MLX90316 uses only the parallel components of magnetic flux (i.e., B, X, and B Y) on the rotating magnet IC. The block diagram of Fig. 2 shows the original Holzer signals V, X, and V Y digitized before multiplexing the chopped wave amplification. Microcontroller based digital signal processing (DSP) kernel further processes signal to angle information. The angle (alpha) output is the analog signal (after DAC) and the digital PWM serial signal. When the radial magnet (circular magnet, planar magnetic field) is rotated above IC (Fig. 3), the magnetic flux components B, X, and B Y produce two orthogonal sinusoids (Figure 4), and the B X is proportional to the Cosine (alpha), B, Y is proportional to sine (alpha). Figure 4. The rotating magnetic field produces two orthogonal sine waves, to the X and Y axes, magnetic flux B, X, and B Y. The original Holzer signals V, X, and V Y are proportional to B, X, and B Y respectively. After amplification, the MLX90316 embedded DSP performs the following operations to angle information: (1) Among them: A = gain V X = X direction original Holzer signal V Y = Y direction original Holzer signal Alpha = angle MLX90316 directly outputs the angle position of the upper rotating magnet (maximum 360 degrees), which is actually the rotation position of the sensor IC. Equation 1 highlights two key features of the three axis Holzer technique: after amplification, two Holzer signals are separated; compensating for the matching errors of two signals will not affect the output angle accuracy. Three axis Holzer IC Without the influence of the thermal coefficient of the magnet, the air gap will change, whereas the ordinary Holzer technique is directly affected by these deviations. MLX90316 also comes with EEPROM Storage and chip function and output characteristics related parameters, module installation can also adjust the output transmission characteristics. Rotating position sensor performance The primary quality factor of any position sensor is linear error, which includes all deviations associated with the ideal output transmission characteristic (i.e. linearity). These deviations involve electrical, mechanical, magnetic, thermal, and device aging problems. The performance of the rotary position sensor is mainly affected IC inherently linear errors and sensor module components introduce other error effects. IC inherent error. To evaluate IC performance, V, X, and V Y are not directly proportional to B, X, and B Y, and you need to consider the ideal formula bias (equation 1): (2) Among them, V, X0 and V Y0 reflect the original signal misalignment, A, X and A Y reflect the sensitivity mismatch of the two channels, and the beta is perpendicular (quadrature) error. The linear error is given by equation 3. (3) IC uses EEPROM to set compensation parameters to reduce linear errors. Figure 5 shows the effect of each component of the residual linear error after compensation, and the MLX90316 data sheet illustrates this. Figure 5. (A) is a typical curve with the greatest disturbance in the period (B) sensitivity mismatch within two cycles (C) orthogonality in two cycles After compensation, besides linear error, three other effects should be considered: Temperature influence. The temperature is mainly affected by misalignment, and in the thermal offset drift specification, the effect on the error budget is similar to that shown in Fig. 5A. The contribution of the coefficient of thermal mismatch to the total error is 0.1 degrees. Original signal nonlinearity. The original signal itself is nonlinear, and it will affect the angular linearity error, as shown in figure 6. Once the IMC is saturated, this nonlinearity can be observed. Within normal range, the nonlinear contribution is less than 0.1 degrees. Hysteresis. Amorphous IMC structures are not produced and able to measure hysteresis. It can be considered that the hysteresis error is zero (very small). Fig. 6. the linear error curve shows the nonlinear effects of the original signal within four cycles. Mechanical error. Mechanical design requires the assembly of moving parts (e.g., shafts), magnets, and IC into the same shell. IC For linear errors, the rotating position sensor error budget also takes into account the mechanical and magnet structure effects. The main contribution is the radial eccentricity of the phase induction unit when the magnet revolves around its center. From experience, to a linear error of less than 0.3 degrees (the error comes from the deviation of the magnet from the shaft), the diameter of the magnet should be more than 20 times larger than the maximum eccentricity (Figure 7). Fig. 7. the influence of eccentricity of magnet on nonlinear error. Although the gap change does not affect the linear error, the magnet tilt, combined with the IC plane bias, will introduce significant errors. The three axis Holzer sensor MLX90316 simplifies the design of non-contact rotary position sensors. The three axis Holzer technique can replace the inductance and magnetoresistance technique to replace the traditional resistive contact voltage divider. The technology is also capable of implementing 1D (for example, linear position sensors), 2D (e.g., rotary position sensors) and 3D (e.g., joystick position sensors) sensors. Selection. Using MLX90316 The construction of the position sensor requires the use of magnets, and the sensing position is fitted with moving mechanical components (usually connected to the end of the shaft). Horizontal magnetic flux, uniform magnet, can be used. Magnet size and material are not important; mechanical, magnetic, and heat capacity limits, horizontal magnetic flux must 20 - 70 mT (for example, 45 mT + 25 mT). The lower bound is related to the signal to noise ratio, while the upper bound is affected by the saturation of the IMC structure and produces linear errors after saturation. In the air gap problem, the actual air gap at the distance from IC is greater than 7.5mm The ring magnet is better than the disk magnet. The magnet can be placed at the end of the shaft and can be wound around the shaft with a ring magnet. Special magnet designs can also be used to obtain normal transmission characteristics of rotating position sensors (e.g., B, X) Cosine (alpha), B, Y is proportional to sine (alpha), and it can also measure other physical parameters (such as linear shift, etc.). 00101, more related articles. In the elevator transformation of several suggestions, February 21, 2010? How to choose switch socket, January 29, 2010? 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