As a position sensor, vari able reluctance vr resolver is widely applied to many fields as well as electric vehicles ev. With more complex circuitry and the addition of software and specific mechanical hardware, a vr sensor can also provide measurements of linear velocity. The variable reluctance vr resolver is usually used to measure the shaft angle of motor. A vr resolver comprises a resolver stator and a resolver rotor. Reluctance motors can deliver high power density at low cost, making them attractive for many. Variable reluctance resolvers vrr variable reluctance resolvers ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. The variable reluctance resolver vrr is commonly used in the automotive industry as a rotor position sensor. Electrical engineering in japan english translation of denki gakkai ronbunshi. Positional sensors linear variable differential transformers lvdts the linear variable differential transformer lvdt is an accurate and reliable method for measuring linear distance. However, in case of evhev, variable reluctance resolver is used because of vibration, durability and reliability of position signal.
The design of a variablereluctance resolver structure which can be integrated into brushless motors is considered. Resolvers are often used in inverterdriven permanent magnet synchronous motors as the rotor position sensors. 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. Ep1557644a1 redundant variable reluctance resolver. In this paper, the relationship between the numbers of stator slots, winding polarities and rotor poles for variable reluctance resolvers is derived and verified. A novel variable reluctance resolver for hevev applications. Ducommun variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. It is capable of detecting highprecision and highresolution positions for outputting optimum torque at all times. Furthermore, based on the operating principle of the resolver its rotor needs a single phase winding. Therefore to support key oems we have set up a global engineering team to provide both integration and design support. Analysis and improvement on the structure of variable. 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.
Lm1815 adaptive variable reluctance sensor amplifier. I was trying to understand the working of variable reluctance resolver. Performance analysis of disk type variable reluctance. Its use in the aerospace and defense industries has been limited due to inadequate accuracy performance. The variable frequency drives vfdsfor switched releuctance motors srms are slightly simpler than conventional vfds. It generates torque through magnetic reluctance reluctance motor subtypes include synchronous, variable, switched and variable stepping. The structure and the total output voltages of signal windings are. 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 magnetic field is altered by using a toothed wheel made from a ferrous material. The stator and the rotor of the motor are aligned in such a way that the magnetic reluctance is minimum. Research article analysis of novel variable reluctance. Proposal of new windings for 5x variable reluctance resolvers.
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. What are the advantages and disadvantages of a reluctance. A ferrous pole wheel passing the sensor face changes the magnetic field strength, resulting in an ac voltage being induced in the coil. And unlike other variable reluctance resolvers, the rotasyn utilizes a constant air gap so it is less sensitive to eccentricity and stray magnetic fields. When combined with basic electronic circuitry, the sensor detects the change in presence or proximity of ferrous objects. Minebea has begun delivering highperformance vr resolver. Request pdf a novel variable reluctance resolver for hevev applications in order to simplify the manufacturing process of variable reluctance vr. 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. Resolver a novel slotless design of variable reluctance.
Precision resolvertodigital converter measures angular position and velocity. Development of variable reluctance resolver for position. 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. Development of variable reluctance resolver for position feedback greg leibovich and sara senanian abstract the variable reluctance resolver vrr is commonly used in the automotive industry as a rotor position sensor. Each of the two identical channels interfaces with a variable. Analysis of novel variable reluctance resolver with. Oct 18, 2012 a vr resolver comprises a resolver stator and a resolver rotor. Lvdts find uses in modern machinetool, robotics, avionics, and computerized manufacturing. This is accomplished by using a sensor which outputs a voltage as the magnetic field around it changes. Most of the resolvers used in high precision servomechanism are twopole, woundrotor ones. Ro solid rotor, variable reluctance, frameless, brushless resolvers for severe applications.
Abstracta novel variable reluctance vr resolver with nonoverlapping tooth coil windings is proposed in this paper. The lm1815 is an adaptive sense amplifier and default gating circuit for motor control applications. Variable reluctance stepper motor its working circuit. The purpose of this paper is to present a simulationbased approach capable of determining a more accurate rotor shape of variable reluctance resolver in order to cut the time and cost of its development before testing a physical prototype. Ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. The principle of variable reluctance stepper motor is based on the property of the flux lines which capture the low reluctance path. 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. Variable reluctance resolver and method and apparatus for. Angular position error detection of variable reluctance.
Reluctance motors are simple and the rotors are very rugged, suitable for high speed application. Admotec ro series rotasyn variable reluctance frameless resolvers provide high performance in measurement and feedback applications where traditional resolvers fail. 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. Design and analysis of variable reluctance resolver for. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos. A study for characteristics of variable reluctance. Sep 29, 2016 reluctance motors are simple and the rotors are very rugged, suitable for high speed application. Analysis of windings in variable reluctance resolver request pdf. 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 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. Theory and characteristics of novel variable reluctance 1x.
Variable reluctance resolver, accuracy, physical parameters, time steps, finite element method. A variable reluctance sensor commonly called a vr sensor is a transducer that measures changes in magnetic reluctance. This offers significant advantages in price, weight, and envelope dimensions. A variable reluctance resolver according to claim 4, wherein the bulge assumes a platelike shape. 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. 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. 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. Ishizaki a, takasaki k, shimomura s, masaki k, kitazawa k. Pdf linear variable reluctance lvr resolvers have substantial benefits that make them suitable for linear motion control drives.
I have attached the image of the same which i am trying to understand. The analyzed vr resolver is made by varying rotorpole shape according to a certain waveform, which can be. 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. However, there is different opportunity for their rotor. Vr resolver generates output signal as sin, cos and it converted position of rotor through resolver todigital converter 4, 5. 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.
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. 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. Recognizing product cost constraints, we have already. A novel vr resolver with asymmetric teeth on the stator is proposed to. The synchroresolver conversion handbookis designed as a practical reference source. Performance analysis of disk type variable reluctance resolver under mechanical and electrical faults f.
A study for characteristics of variable reluctance resolver considering end slot leakage inductance and eccentricity zhilongwang1, kichan kim2 1. 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 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. 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. Design and analysis of variable reluctance resolver for hybridelectric vehicle. The resolver is designed to provide abs variablereluctance resolver design guidelines ieee conference publication. The resolver is designed to provide abs variable reluctance resolver design guidelines ieee conference publication. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. A first insulator 300 is formed together with a terminal pin base 311 on which terminal pins 320 are provided. There are two types of the variable reluctance stepper motor. 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. The performance of the resolver is discussed using the proposed winding and all previous winding methods. Analysis of windings in variable reluctance resolver ieee xplore.
The variable reluctance block models a variable reluctance, that is, a component that resists flux flow. And unlike other variablereluctance resolvers, the rotasyn utilizes a constant air gap so it is less sensitive to eccentricity and stray magnetic fields. Development of variable reluctance resolver for position feedback. Unlike conventional resolvers, the vrrs have both primary and secondary windings in the stator and no windings on the rotor. Analysis of novel variable reluctance resolver with asymmetric. 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. But i am not able to understand the role of rotor here. Pdf performance analysis of linear variable reluctance. The dse series variable reluctance vr speed sensors consist of an iron core, an inductive coil, and a permanent magnet. Understanding of variable reluctance resolver i have attached the image of the same which i am trying to understand.
Perfect for aerospace, downhole, nuclear, and other. The synchro resolver conversion handbookis designed as a practical reference source. A study for characteristics of variable reluctance resolver. 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. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. The configuration of their stator winding is based on variableturn, ontooth method. The results show on best performance when using the resolver as position sensor.
Variablereluctance resolver design guidelines ieee. Unlike conventional resolvers, vrrs have both primary and secondary windings in the stator assembly and no windings in the rotor. Vr resolver generates output signal as sin, cos and it converted position of rotor through resolvertodigital converter 4, 5. Us5949359a variable reluctance resolver to digital. Analysis of windings in variable reluctance resolver. Variable reluctance in electromagnetic systems matlab. Theory and characteristics of novel variable reluctance 1x resolver. The design of a variable reluctance resolver structure which can be integrated into brushless motors is considered. This offers significant advantages in price, weight, and. Utilizing more than 50 years of experience in the aerospace industry we have designed a resolver range that provides accurate angle measurement with. Variable reluctance sensors engine control computers ecu require an input to determine angular position of the crank andor camshaft. Mar 10, 2011 reluctance motor with resolver peter ifj. Reluctance sensor interface ic the ncv1124 is a monolithic integrated circuit designed primarily to condition signals from sensors used to monitor rotating parts. Here, a new winding is proposed for 5x variable reluctance resolver.