A study for characteristics of variable reluctance resolver considering end slot leakage inductance and eccentricity zhilongwang1, kichan kim2 1. A study for characteristics of variable reluctance. Lm1815 adaptive variable reluctance sensor amplifier. Request pdf a novel variable reluctance resolver for hevev applications in order to simplify the manufacturing process of variable reluctance vr. The resolver is designed to provide abs variable reluctance resolver design guidelines ieee conference publication. Analysis of novel variable reluctance resolver with. Vr resolver generates output signal as sin, cos and it converted position of rotor through resolvertodigital converter 4, 5. The variable reluctance vr resolver is usually used to measure the shaft angle of motor. Furthermore, based on the operating principle of the resolver its rotor needs a single phase winding. I have attached the image of the same which i am trying to understand.
The variable reluctance block models a variable reluctance, that is, a component that resists flux flow. Request pdf analysis of windings in variable reluctance resolver in this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable. Theory and characteristics of novel variable reluctance 1x. Ducommun variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. Ishizaki a, takasaki k, shimomura s, masaki k, kitazawa k. Minebea has begun delivering highperformance vr resolver. Development of variable reluctance resolver for position feedback. Variable reluctance stepper motor its working circuit. Resolver a novel slotless design of variable reluctance. Theory and characteristics of novel variable reluctance 1x resolver. Most of the resolvers used in high precision servomechanism are twopole, woundrotor ones. There are two types of the variable reluctance stepper motor. A variable reluctance resolver wherein the sine and cosine values are processed to obtain digital values for position with an accuracy similar to that of a conventional resolver. Abstracta novel variable reluctance vr resolver with nonoverlapping tooth coil windings is proposed in this paper.
The variable reluctance motor is based on the principle that an unrestrained piece of iron will move to complete a magnetic flux path with minimum reluctance, the magnetic analog of electrical resistance synchronous reluctance. Analysis of novel variable reluctance resolver with asymmetric teeth on the stator chengjunliu,mingqi,andmengzhao department of electrical engineering and automation, harbin institute of technology, harbin, china correspondence should be addressed to chengjun liu. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. The variable frequency drives vfdsfor switched releuctance motors srms are slightly simpler than conventional vfds. Sep 29, 2016 reluctance motors are simple and the rotors are very rugged, suitable for high speed application. The principle of variable reluctance stepper motor is based on the property of the flux lines which capture the low reluctance path. A study for characteristics of variable reluctance resolver. Admotecs patented position sensor technology resolver technology produces a resolver with fewer parts, a solid rotor without slots, windings, or the need for a rotating transformer. This is accomplished by using a sensor which outputs a voltage as the magnetic field around it changes. Reluctance motors are simple and the rotors are very rugged, suitable for high speed application. Analysis of windings in variable reluctance resolver ieee xplore. In the proposed winding method, all the stator teeth are devoted to the signal windings and a peripheral slot is added to the stator core including two excitation coils.
If i apply a sine wave as excitation input to the primary winding, the same will be reflecting on the secondary winding based on magnetic induction. Us5949359a variable reluctance resolver to digital. Pdf performance analysis of linear variable reluctance. Each of the two identical channels interfaces with a variable. It is capable of detecting highprecision and highresolution positions for outputting optimum torque at all times. It generates torque through magnetic reluctance reluctance motor subtypes include synchronous, variable, switched and variable stepping. In order to realize the high precision control in the motor and drive system of hybridelectric vehicle, it is necessary to test the rotor position and motor speed in realtime.
Variable reluctance resolver, accuracy, physical parameters, time steps, finite element method. Performance analysis of disk type variable reluctance resolver under mechanical and electrical faults f. Analysis and improvement on the structure of variable. Ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. Electrical engineering in japan english translation of denki gakkai ronbunshi. A novel variable reluctance resolver for hevev applications. Resolvers, electromechanical sensors that measure precise angular position, operate as variable coupling transformers, with the amount of magnetic coupling between the primary winding and two secondary. What are the advantages and disadvantages of a reluctance. Vr resolver rotation angle sensor the vr resolver variable reluctance type resolver is an angle sensor that detects the magnetic pole position of the motor. Analysis of windings in variable reluctance resolver.
Perfect for aerospace, downhole, nuclear, and other. The resolver is designed to provide abs variablereluctance resolver design guidelines ieee conference publication. Analysis of windings in variable reluctance resolver request pdf. A variable reluctance resolver according to the present invention includes m resolver units disposed in tandem, each comprising a rotor and a stator, where m is an integer not less than 2. Oct 18, 2012 a vr resolver comprises a resolver stator and a resolver rotor. Variable reluctance resolvers vrr variable reluctance resolvers ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. A ferrous pole wheel passing the sensor face changes the magnetic field strength, resulting in an ac voltage being induced in the coil. With more complex circuitry and the addition of software and specific mechanical hardware, a vr sensor can also provide measurements of linear velocity. Proposal of new windings for 5x variable reluctance resolvers. The design of a variablereluctance resolver structure which can be integrated into brushless motors is considered. Understanding of variable reluctance resolver i have attached the image of the same which i am trying to understand. The stator and the rotor of the motor are aligned in such a way that the magnetic reluctance is minimum. The synchroresolver conversion handbookis designed as a practical reference source. Ro solid rotor, variable reluctance, frameless, brushless resolvers for severe applications.
As a position sensor, vari able reluctance vr resolver is widely applied to many fields as well as electric vehicles ev. The stator has a stator yoke, a plurality of stator magnetic poles projecting from the yoke, and excitation and output windings applied to the stator. Teeth whose number is equal to the product of an integer p of 2 or more and 4 are arranged in an annular shape from the inner circumfere. Precision resolvertodigital converter measures angular. It discusses the theory of operation of data converter products synchro, resolver, and linear variable differential transformer lvdt, performance parameters, and design factors for typical applications. The ratio of the magnetomotive force mmf across the component to the resulting flux that flows through the component is defined as the reluctance, and is.
Precision resolvertodigital converter measures angular position and velocity. The magnetic field is altered by using a toothed wheel made from a ferrous material. A novel vr resolver with asymmetric teeth on the stator is proposed to achieve the minimal number of active teeth and eliminate the amplitude imbalance of the output voltages of sin and cos coils by bringing the fifth compensating tooth. The design of a variable reluctance resolver structure which can be integrated into brushless motors is considered.
If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. Reluctance motors can deliver high power density at low cost, making them attractive for many. The variable reluctance type resolver is widely used in an electric motor for hybrid electric vehicles as a rotor position sensor. The variable reluctance resolver is driven at a constant speed and the incremental digital values are recorded and processed to extract the fundamental through a fourier transform. Unlike conventional resolvers, the vrrs have both primary and secondary windings in the stator and no windings on the rotor. The analyzed vr resolver is made by varying rotorpole shape according to a certain waveform, which can be. A variable reluctance sensor commonly called a vr sensor is a transducer that measures changes in magnetic reluctance. Variable reluctance in electromagnetic systems matlab.
Variablereluctance resolver design guidelines ieee. Positional sensors linear variable differential transformers lvdts the linear variable differential transformer lvdt is an accurate and reliable method for measuring linear distance. The variable reluctance resolver vrr is commonly used in the automotive industry as a rotor position sensor. Study of reduce harmonic and increasing positioning. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos. The sense amplifier provides a oneshot pulse output whose leading edge coincides with the negativegoing zero crossing of a ground referenced input signal such as. Admotec ro series rotasyn variable reluctance frameless resolvers provide high performance in measurement and feedback applications where traditional resolvers fail. And unlike other variablereluctance resolvers, the rotasyn utilizes a constant air gap so it is less sensitive to eccentricity and stray magnetic fields. The dse series variable reluctance vr speed sensors consist of an iron core, an inductive coil, and a permanent magnet. Research article analysis of novel variable reluctance. Utilizing more than 50 years of experience in the aerospace industry we have designed a resolver range that provides accurate angle measurement with.
Design and analysis of variable reluctance resolver for hybridelectric vehicle. Angular position error detection of variable reluctance. In this paper, the relationship between the numbers of stator slots, winding polarities and rotor poles for variable reluctance resolvers is derived and verified. In a variable reluctance resolver having terminal pins at an insulator, a technique for preventing deformation of the terminal pins, shorting between the terminal pins, and contact failure at portions of the terminal pins is provided. Analysis of novel variable reluctance resolver with asymmetric. A novel vr resolver with asymmetric teeth on the stator is proposed to. Resolvers are often used in inverterdriven permanent magnet synchronous motors as the rotor position sensors. Here, a new winding is proposed for 5x variable reluctance resolver. A first insulator 300 is formed together with a terminal pin base 311 on which terminal pins 320 are provided.
Variable reluctance sensors engine control computers ecu require an input to determine angular position of the crank andor camshaft. A variable reluctance resolver according to claim 4, wherein the bulge assumes a platelike shape. When combined with basic electronic circuitry, the sensor detects the change in presence or proximity of ferrous objects. This offers significant advantages in price, weight, and envelope dimensions. The configuration of their stator winding is based on variableturn, ontooth method. In this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable reluctance resolvers is derived and verified. I was trying to understand the working of variable reluctance resolver. The synchro resolver conversion handbookis designed as a practical reference source.
Reluctance sensor interface ic the ncv1124 is a monolithic integrated circuit designed primarily to condition signals from sensors used to monitor rotating parts. Pdf linear variable reluctance lvr resolvers have substantial benefits that make them suitable for linear motion control drives. The structure and the total output voltages of signal windings are. Performance analysis of disk type variable reluctance. A designtocost alternative to conventional variable reluctance resolvers for the electric drives control 2014011694 many synchronous electric motors require a very accurate position sensor compatible with a sinusoidal control. However, there is different opportunity for their rotor. The lm1815 is an adaptive sense amplifier and default gating circuit for motor control applications. A vr resolver comprises a resolver stator and a resolver rotor. The results show on best performance when using the resolver as position sensor. Variable reluctance resolver and method and apparatus for.
Therefore to support key oems we have set up a global engineering team to provide both integration and design support. Design and analysis of variable reluctance resolver for. Vr resolver generates output signal as sin, cos and it converted position of rotor through resolver todigital converter 4, 5. Unlike conventional resolvers, vrrs have both primary and secondary windings in the stator assembly and no windings in the rotor. Recognizing product cost constraints, we have already. The performance of the resolver is discussed using the proposed winding and all previous winding methods. And unlike other variable reluctance resolvers, the rotasyn utilizes a constant air gap so it is less sensitive to eccentricity and stray magnetic fields. Ep1557644a1 redundant variable reluctance resolver. Mar 10, 2011 reluctance motor with resolver peter ifj. Lvdts find uses in modern machinetool, robotics, avionics, and computerized manufacturing. However, in case of evhev, variable reluctance resolver is used because of vibration, durability and reliability of position signal. But i am not able to understand the role of rotor here. Although accuracy of encoders is among different magnetic sensors, the encoder and resolver are commonly used as the position and speed sensors for an inverterdriven electric motors and motion. A variable reluctance resolver according to claim 1, wherein the salient pole portion is a portion of the rotary shaft portion that is caused to bulge and assumes the form of a bulge.
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