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. The magnetic field is altered by using a toothed wheel made from a ferrous material. Variable reluctance sensors engine control computers ecu require an input to determine angular position of the crank andor camshaft. The vr resolver has a simple structure and a structure thinner than other resolvers. The design of a variablereluctance resolver structure which can be integrated into brushless motors is considered. Design and analysis of variable reluctance resolver. Study of reduce harmonic and increasing positioning. This chapter provides a brief introduction to electrical machines which have special applications. A resolver is a rotating transformer, typically with a primary winding on the rotor and two secondary windings on the stator. In the case of a variable reluctance resolver, there are no wind. Variable reluctance sensors vrs are built of a small magnet in shape of a stick. Position sensor of variable reluctance resolver is required in permanent magnet motors for electric vehicle and hybrid electric vehicle in order to control position or rotating speed. 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.
Ee2403 special electrical machines a course material on. Synchro and resolver engineering handbook contents page section 1. Development of variable reluctance resolver for position. In this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable reluctance resolvers is derived. Variable reluctance resolvers vrr variable reluctance resolvers ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. In this site, you will find a listing of products offered by the participating companies. Solid rotor, variable reluctance, frameless, brushless resolvers for severe applications. The spi is a 16bits full duplex synchronous serial slave interface. Therefore to support key oems we have set up a global engineering team to provide both integration and design support. The variable reluctance type resolver is widely used in an electric motor for hybrid electric vehicles as a rotor position sensor. It was the first integrated reference source on synchro resolver data converters.
Stepping motor with resolver angle sensor brushless motors. Accuracy improvement in variable reluctance resolvers ieee. The structure and the total output voltages of signal windings are. In operation, two voltages, x and y, are applied to the inputs of the resolver and one output phase is nulled. The vr resolver variable reluctance type resolver is an angle sensor that detects the magnetic pole position of the motor. The results show on best performance when using the resolver as position sensor. Each motorgenerator must have a rotor position sensor. Angular position error detection of variable reluctance resolver using.
Unlike conventional resolvers, the vrrs have both primary and secondary windings in the stator and no windings on the rotor. The resolver provides an absolute readout, but pending a loss of memory due to a fault condition, the resolver would be unable to determine which 19th of a segment the wheel would be. A variable reluctance sensor is a transducer that measures changes in magnetic reluctance. The analyzed vr resolver is made by varying rotorpole shape according to a certain waveform, which can be determined by solving an inverse electromagnetic field problem. Design and analysis of variable reluctance resolver for hybridelectric vehicle. Structure of variable reluctance resolver because the flux variation in length is the proposed resolver is a variable reluctance resolver with variation flux coupling area between rotor and stator. Because of inherent simplicity, robustness of construction and low cost. The variable reluctance vr resolver is usually used to measure the shaft angle of motor. Research article analysis of novel variable reluctance.
Unlike conventional resolvers, the vrr is based on variable reluctance between the stator and rotor segments. How resolvers work, resolver signal format, and how to use resolvers with commercially available resolver todigital converters. Variable reluctance resolver a resolver is a rotating transformer typically with a primary winding on the rotor and two secondary windings on the stator. Since 1968 ddc has been the leader in new product development in the field of synchro resolver converters. 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. The synchronous reluctance motor has no synchronous starting torque and runs up from stand still by induction action. Development and acceptance testing of the dual wheel. Ad2s1210 datasheet1536 pages ad variable resolution.
When the magnetic flux changes due to the movement of the toothed wheel, a voltage is induced. In this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable reluctance resolvers is derived and verified. This thesis presents a design method for a switched reluctance sr motor to optimise torque production for two types of 3 phase 64 poles srm and 86 poles srm designs. A resolver is a rotating transformer typically with a primary winding on the rotor and two secondary windings on the stator. The equipment includes drive motors, resolvers and variable reluctance sensors.
The variable reluctance sensor is strainbased, wherein a magnetic circuit is formed, and the parameter input causes mechanical deflection of the spring member as a function of pressure, force, or acceleration. The vrr is structured to vary the reluctance of the magnetic path between the. To provide a static output capability, variable reluctance sensors require an oscillator and demodulator system internally limiting. With more complex circuitry and the addition of software and specific mechanical hardware, a vr sensor can also provide measurements of linear velocity, angular velocity, position, and. Analysis and improvement on the structure of variable reluctance resolver. Analysis of windings in variable reluctance resolver request pdf. Study on the optimal design of a novel slotless resolver. A novel variable reluctance resolver for hevev applications. The configuration of their stator winding is based on variable turn, ontooth method. The conventional winding method for variable airgap. Utilizing more than 50 years of experience in the aerospace industry we have designed a resolver range that provides accurate angle measurement with. Because of the axial magnetic circuit structure and special variable reluctance principle, axial flux reluctance resolver has the advantages of compact, small in volume and constant inputoutput. Most of the resolvers used in high precision servomechanism are twopole, woundrotor ones.
Admotecs ro series rotasyn variable reluctance frameless resolvers. Sr motors require precise control to optimise the operating efficiency. 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. Ee2403 special electrical machines sce department of electrical and electronics engineering because there is no rotor copper loss. Analysis and improvement on the structure of variable. Performance analysis of disk type variable reluctance resolver under mechanical and electrical faults f. Now after 30 plus years, this hardcopy book is released as an electronic file. The resolver is designed to provide abs variablereluctance resolver design guidelines ieee conference publication. An introduction to resolvers and resolver todigital converters. An effective design method of a novel slotless resolver with a variable reluctance rotor is proposed using the finiteelement method fem. General electric vr ii owners manual, service manuals and schematics are for reference only and the vinyl engine bears no responsibility for errors or other inaccuracies. A new technique for analysis of static eccentricity in. Aselectromagneticrotorpositionsensorof motor, variable reluctance vr resolver, which has simple. Request pdf a novel variable reluctance resolver for hevev applications in order to simplify the manufacturing process of variable reluctance vr.
Analysis of windings in variable reluctance resolver. Therefore, rotor position sensor of traction motor that has more vibration and disturbance is more suitable for use resolver than use encoder 8. If the inline pdf is not rendering correctly, you can download the pdf file here. Ep1557644a1 redundant variable reluctance resolver. When combined with basic electronic circuitry, the sensor detects the change in presence or proximity of ferrous objects. Ad2s1200 12bit rd converter with reference oscillator. Unlike conventional resolvers, vrrs have both primary and secondary windings in the stator assembly and no windings in the rotor.
Reproduction without prior permission or for financial gain is strictly prohibited. The double variable reluctance resolver according to claim 10, wherein the double resolver has a plurality of angular stator magnetic pole positions, and every other magnetic pole position is occupied by a stator magnetic pole of the first plurality, and magnetic poles of the second plurality are located between the poles of the first plurality. The variable reluctance sensor vrs interface converts an output signal of a vrs into an 5v logic level compatible to 5v input ports of an micro controller. The voltages of the output windings of the resolver vary as sine and cosine functions of the rotor angular position. Resolver a novel slotless design of variable reluctance. Disk type variable reluctance dtvr resolvers have distinguished performance under run out fault comparing to conventional sinusoidal rotor resolvers. Analysis of windings in variable reluctance resolver ieee xplore. Angular position error detection of variable reluctance. Jump to content jump to main navigation jump to main navigation. This offers significant advantages in price, weight, and. Variablereluctance resolver design guidelines ieee. Variable reluctance vr resolvers are widely used in many industrial applications. This paper documents the development and qualification of the vrr for use in commutation of brushless dc motors that minimizes envelope size, mass and.
Development of variable reluctance resolver for position feedback. Performance analysis of disk type variable reluctance. The authors are with the department of electrical and computer. A study for characteristics of variable reluctance. Introduction whenvectorcontrol,directtorquecontrol,andothercontrol strategies are applied in ac governor system with high dynamic performance, the rotor angular position is required necessarily. A quick look that the resolvers in a gen 1 prius transaxle. Recognizing product cost constraints, we have already. Around this stick there are several windings of copper. This is accomplished by using a sensor which outputs a voltage as the magnetic field around it changes.
However, there is different opportunity for their rotor. Furthermore, based on the operating principle of the resolver its rotor needs a single phase winding. Ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. The variable reluctance design figure 2b variable reluctance stepper motors consist of a more complicated design and require an accurate manufacturing of both the stator and the rotor. Variable reluctance resolver modelisation and angular. Each wheel 280 mm diameter is capable of rotating the optical elements to one of 9 desired positions, supported by a preloaded duplex pair of angular contact bearings. In addition, unlike the encoder, resolver can grasp the position information of rotor in the static state of motor 7. 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. Minebea has begun delivering highperformance vr resolver. Analysis of novel variable reluctance resolver with. The rotor position then indicates the vector angle equal to the arctan xy. Ducommun variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. Us7157906b2 double variable reluctance resolver for a. Mechanical parts, rotary components, circuit components, optical components.
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