There are two types of the variable reluctance stepper motor. A vr resolver includes a rotor having a rotary shaft portion and a salient pole portion formed integrally. Analysis of windings in variable reluctance resolver request pdf. The transducer externally energized transducer, called the variablereluctance type, is one in which the magnetic circuit is broken by an air gap. Twelveslot twosaliency variable reluctance resolver with. Lavet type stepping motor permanent magnet motors use a permanent magnet pm in the rotor and operate on the attraction or repulsion between the rotor pm and the stator electromagnets. The rotor of a reluctance motor is a squirrel cage with some rotor teeth removed in the certain places to provide the desired number of. Except for the permanent split capacitor psc motor, all motors 1phase im are provided with a. The present invention relates to a variable reluctance resolver comprising an outer stator which has a field winding and. Variable reluctance stepper motor its working circuit. 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. Variable reluctance resolvers vrr variable reluctance resolvers ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. A quick look that the resolvers in a gen 1 prius transaxle. Help for vr sensor signal conditioning variable reluctance signal conditioning ask question asked 5 years ago.
A variable reluctance motor intended to move in discrete steps, stop, and start is a variable reluctance stepper motor, covered in another section. Reluctance motor a single phase synchronous reluctance motor is basically the same as the single cage type induction motor. Development of variable reluctance resolver for position. The double variable reluctance resolver also functions as a multiple speed resolver system. This offers significant advantages in price, weight, and. A new noncontact displacement sensor employing a combination of variable reluctance technique and hall.
The salient pole portion may be a bulged portion of the rotary shaft portion. The excitation winding in the proposed resolver is replaced with one axial coil that is perpendicular to the signal windings. Synchro and resolver engineering handbook moog, inc. Ducommun variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. Analysis of novel variable reluctance resolver with. The dse series variable reluctance vr speed sensors consist of an iron core, an inductive coil, and a permanent magnet. In this study, a new 12slot twosaliency variable reluctance vr resolver with simple nonoverlapping windings is proposed.
A ferrous pole wheel passing the sensor face changes the magnetic field strength, resulting in an ac voltage being induced in the coil. But i am not able to understand the role of rotor here. 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. It is capable of detecting highprecision and highresolution positions for outputting optimum torque at all times. The principle of variable reluctance stepper motor is based on the property of the flux lines which capture the low reluctance path. The variable reluctance resolver vrr is commonly used in the automotive industry as a rotor position sensor. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Unlike conventional resolvers, the vrrs have both primary and secondary windings in the stator and no windings on the rotor. Each motorgenerator must have a rotor position sensor. Theory and characteristics of novel variable reluctance 1x resolver. Angular position error detection of variable reluctance. 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. Positional sensors linear variable differential transformers lvdts the linear variable differential transformer lvdt is an accurate and reliable method for measuring linear distance. It generates torque through magnetic reluctance reluctance motor subtypes include synchronous, variable, switched and variable stepping.
The stator and the rotor of the motor are aligned in such a way that the magnetic reluctance is minimum. With more complex circuitry and the addition of software and specific mechanical hardware, a vr sensor can also provide measurements of linear velocity. Ducommuns variable reluctance resolvers vrrs are highly reliable brushless resolvers without rotary transformers. In this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable reluctance resolvers is derived and verified. Basic principles two coils of wire and a magnetic core core position changes coil reluctance. The second rotor portion has n1 salient poles provided about the center axis at uniform angular intervals. The rotor has two upper and lower saliencies located. Unlike conventional resolvers, vrrs have both primary and secondary windings in the stator assembly and no windings in the rotor.
The reference winding is located in the rotor of the resolver, the sin and cos. 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. I have attached the image of the same which i am trying to understand. It is characterized by an outer surface form that makes the fluctuation part of gap permeance very in proportion to cos. They are both synchronous motors, similar to the permanent magnet brushless dc motor except that the rotor is constructed from iron rather than from permanent magnets. Theory and characteristics of novel variable reluctance 1x. Development of variable reluctance resolver for position feedback.
The resulting motorresolver combination is free of mechanical resonances and nonlinearities and thus offers a significant improvement in positioning speed and. I was trying to understand the working of variable reluctance resolver. Variable reluctance motors or steppers actually use rotors like those in figure below. Reluctance sensor interface ic the ncv1124 is a monolithic integrated circuit designed primarily to condition signals from sensors used to monitor rotating parts. Reluctance motor technical seminar report annual year 2014, electrical and electronics department, sdmt, ujire574240 page 2 is similar to that of any one of the singlephase induction motors. The stator of the motor has the main and auxiliary winding. Find out information about variablereluctance pickup. Electrical engineering in japan english translation of denki gakkai ronbunshi.
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. A variablereluctance motor is constructed from ferromagnetic material with salient poles as shown in fig. The variable reluctance type resolver is widely used in an electric motor for hybrid electric vehicles as a rotor position sensor. The structure and the total output voltages of signal windings are. Two or more salient pole portions may be formed on the rotary shaft portion along the length of the rotary shaft portion. It is also called a sinecosine generator and synchroresolver. Variable reluctance sensors engine control computers ecu require an input to determine angular position of the crank andor camshaft. 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 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. Us7157906b2 double variable reluctance resolver for a multiple. Variablereluctance resolver design guidelines ieee xplore. Variablereluctance transducer electronics britannica.
Due to variable air gap between stator and rotor, when rotor rotates, reluctance between stator and rotor also changes. Variable and switched reluctance motors operate on essentially the same principles but are optimised for different applications. A variable reluctance sensor commonly called a vr sensor is a transducer that measures changes in magnetic reluctance. The variable reluctance vr resolver is usually used to measure the shaft angle of motor. Variable reluctance in electromagnetic systems matlab. 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. 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. Vr resolvers, an angle sensor based on a variable reluctance method, have a promising future mainly for use in controlling motors in automobilerelated applications. The validyne dp15 variable reluctance pressure sensor is distinguished by its ability to be reranged for different full scale pressure measurements. A variablereluctance resolver includes a rotor and a stator. A phonograph pickup that depends for its operation on variations in the reluctance of a magnetic circuit due to the movements of an iron stylus assembly. The salient pole portion assumes an arbitrary salient pole profile.
The first rotor portion has n salient poles provided about a center axis at uniform angular intervals, where n is an arbitrary integer not less than 3. Variable reluctance vr motors have a plain iron rotor. Analysis of windings in variable reluctance resolver. Analysis of windings in variable reluctance resolver semantic. This is accomplished by using a sensor which outputs a voltage as the magnetic field around it changes. Live simple, live free tinyhouse prepper recommended for you.
When combined with basic electronic circuitry, the sensor detects the change in presence or proximity of ferrous objects. If smooth rotation is the goal, there is an electronic driven version of the switched reluctance motor. Variable reluctance vr resolvers are widely used in electric vehicles ev and hybrid electric vehicles hev to detect the rotor angle of. The magnetic field is altered by using a toothed wheel made from a ferrous material. Us20050168091a1 variable reluctance resolver and method. Other articles where variablereluctance transducer is discussed. A variable reluctance resolver according to claim 4, wherein the bulge assumes a platelike shape.
The stator of the single phase reluctance and induction motor are same. Proposal of new windings for 5x variable reluctance resolvers. Its use in the aerospace and defense industries has been limited due to inadequate accuracy performance. 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 sensor can be disassembled, a new sensing diaphragm installed and the unit recalibrated to the new full scale pressure. The performance of the resolver is discussed using the proposed winding and all previous winding methods. Synchronous reluctance motordrive package for machine. Electric drives brushless dc and reluctance motors.
Both distributed and nonoverlapping concentric windings with uniform coil turns are used. Minebea has begun delivering highperformance vr resolver. Differentially variable reluctance transformer eric bandstra september 9, 2002 biomechanics of orthopaedic implants. Another novel variable reluctance resolver for hevev applications is proposed in 10. The stator is made from a stack of steel laminations and has six equallyspaced projecting poles or teeth each wound with an exciting coil. A resolver is a rotary transformer where the magnitude of the energy through the resolver windings varies sinusoidally as the shaft rotates. Here, a new winding is proposed for 5x variable reluctance resolver. Ishizaki a, takasaki k, shimomura s, masaki k, kitazawa k. The mechanical movement to be measured is used to change this air gap, thus changing the reluctance, or opposition, to the production of a magnetic field in the circuit. 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. 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. More the air gap, more is the reluctance and viceversa. Design and analysis of variable reluctance resolver for. Vr resolvers are expected to find a wide range of applications, such as in electric powered steering, hybrid cars, electric cars, integrated starter alternaters, brake by.
A resolver control transmitter has one primary winding, the reference winding, and two secondary windings, the sin and cos windings. It can interchange rectangular and polar coordinates. Resolver is a synchro whose rotor is mechanically driven to translate rotor angle into electrical information corresponding to the sine and cosine of rotor angle. In this resolver the rotor core has minimum gap at one side and a maximum gap at another side of the diameter. Thin resolver using the easy magnetization axis of the grainoriented. We offer two package options to help you to improve your competitiveness. In this paper, the relationship between the numbers of stator slots, winding polarities, and rotor poles for variable reluctance resolvers is derived.
The rotor includes axially connected first and second rotor portions. 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. A novel variable reluctance resolver for hevev applications. Each of the two identical channels interfaces with a variable. The variable reluctance block models a variable reluctance, that is, a component that resists flux flow. Variable reluctance resolver and method and apparatus for. Request pdf a novel variable reluctance resolver for hevev. Performance evaluation of disk type variable reluctance resolvers. Design and analysis of variable reluctance resolver for hybridelectric vehicle.
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