A_AP_MR0008E01 © 2019 HIOKI E.E. CORPORATION. ■What is a Resolver? A resolver is a rotary transformer consisDng of a sensor that is used to accurately measure a rotor's angular posiDon relaDve to the stator, as well as speed of rotaDon. It has no electronic parts, which makes it suitable for long-term use in harsh and demanding environments including those with high temperatures, vibraDons, radiaDon and residue, for example heavy industrial motors, servo motors, and automobiles. The digital version of a resolver is a rotary encoder. Motor, Inverter / R&D, TesDng Calculate a Resolver’s Angle of Rota7on Calculate angle of motor rotaDon from input/output signals transmiTed via the resolver ■How are Resolvers Used? A resolver is used as a feedback device to ensure that a rotor will rotate properly, and by extension, the motor will accelerate, slow down, or stop at precise moments. Manufacturers using roboDc equipment depend on reliable servo motors to control arm movement while it operates at opDmal speeds, making both safety and efficiency high prioriDes. Excitation signal cos θ output signal sin θ output signal Resolver’s angle of rotation InformaDon valid as of June 2019. SpecificaDons are subject to change and revision without noDce. Products Used ・ Memory HiCorder MR6000 ・ 4ch Analog Unit U8978, or 4ch Analog Unit U8975, depending on voltage specificaDons of resolver *Please contact your Hioki sales office for more informa5on about how to configure the instrument. CH1-1 CH1-2 CH1-3 ■The Memory HiCorder as a Resolver Digital Converter Resolvers are also a criDcal part of a motor on hybrid or electric vehicles to serve as the rotor posiDon sensor. In order for the car’s AC synchronous motor setup to funcDon properly, the computer needs to know the posiDon of the rotor at any given Dme so that the appropriate stator winding is charged with the proper phase current from the inverter - a resolver is essenDally a sensor that helps to do that. ■How to Set Up and Measure • Input the resolver’s excitaDon signal and output signal to the 4ch Analog Unit U8978 (range: 100mVf.s.～40Vf.s.) • The remaining input slots of the MR6000 can be fiTed with other modules to let you measure temperature, control signals, torque, and current signals at the same Dme in order to evaluate the effect of other factors on the signal as well as measure addiDonal physical properDes of a motor, especially EV motors that require highly efficient but precise control. • Use the built-in waveform calculaDon funcDon to calculate the resolver’s angle of rotaDon and display on the screen During motor development, a mulD-channel Memory HiCorder MR6000 can be used as a resolver digital converter to evaluate the rotor posiDon and the rotaDonal speed based on the signal waveforms. The ability to capture the resolver’s excitaDon signal (reference voltage signal) and two output signals (sine and cosine voltage) with a single analog unit, and then using another channel to make calculaDons for the rotaDon angle, makes it a turnkey soluDon for this applicaDon. The Memory HiCorder’s high 16-bit resoluDon enables customers to capture the slight changes in the output waveforms that serves as valuable informaDon for advancing the precision of the resolver’s posiDon sensing during development.

Calculate a Resolver's Angle of Rotation

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Page 1: Calculate a Resolver's Angle of Rotation

■WhatisaResolver?A resolver is a rotary transformer consisDng of a sensor that is used to accuratelymeasure a rotor's angular posiDon relaDve to the stator, as well as speed ofrotaDon.Ithasnoelectronicparts,whichmakesitsuitableforlong-termuseinharshand demanding environments including those with high temperatures, vibraDons,radiaDon and residue, for example heavy industrial motors, servo motors,andautomobiles.Thedigitalversionofaresolverisarotaryencoder.

Motor,Inverter/R&D,TesDng

CalculateaResolver’sAngleofRota7onCalculateangleofmotorrotaDonfrominput/outputsignalstransmiTedviatheresolver

■HowareResolversUsed?Aresolverisusedasafeedbackdevicetoensurethatarotorwillrotateproperly,andby extension, the motor will accelerate, slow down, or stop at precise moments.Manufacturers using roboDc equipment depend on reliable servo motors to controlarmmovementwhileitoperatesatopDmalspeeds,makingbothsafetyandefficiencyhighprioriDes.

Excitation signal �

cos θ output signal �

sin θ output signal �

Resolver’s angle of rotation

InformaDonvalidasofJune2019.SpecificaDonsaresubjecttochangeandrevisionwithoutnoDce.

ProductsUsed

・ MemoryHiCorderMR6000・ 4chAnalogUnitU8978,or4chAnalogUnitU8975,dependingonvoltagespecificaDonsofresolver*PleasecontactyourHiokisalesofficeformoreinforma5onabouthowtoconfiguretheinstrument.

CH1-1

CH1-2CH1-3

■TheMemoryHiCorderasaResolverDigitalConverter

Resolvers are also a criDcal part of amotor on hybrid or electric vehicles to serve as the rotor posiDonsensor. In order for the car’s AC synchronousmotor setup to funcDonproperly, the computer needs toknowtheposiDonoftherotoratanygivenDmesothattheappropriatestatorwindingischargedwiththeproperphasecurrentfromtheinverter-aresolverisessenDallyasensorthathelpstodothat.

■HowtoSetUpandMeasure•  Inputtheresolver’sexcitaDonsignalandoutput

signal to the 4ch Analog Unit U8978 (range:100mVf.s.～40Vf.s.)

•  TheremaininginputslotsoftheMR6000canbefiTed with other modules to let you measuretemperature, control signals, torque, andcurrent signals at the same Dme in order toevaluate the effect of other factors on thesignal as well as measure addiDonal physicalproperDesofamotor,especiallyEVmotorsthatrequirehighlyefficientbutprecisecontrol.

•  Use the built-inwaveform calculaDon funcDontocalculatetheresolver’sangleofrotaDonanddisplayonthescreen

During motor development, a mulD-channelMemory HiCorder MR6000 can be used as aresolverdigital converter toevaluate the rotorposiDonandtherotaDonalspeedbasedonthesignal waveforms. The ability to capture theresolver’s excitaDon signal (reference voltagesignal)andtwooutputsignals (sineandcosinevoltage) with a single analog unit, and thenusinganotherchanneltomakecalculaDonsforthe rotaDonangle,makes ita turnkeysoluDonfor this applicaDon. The Memory HiCorder’shigh 16-bit resoluDon enables customers tocapture the slight changes in the outputwaveforms that servesasvaluable informaDonfor advancing the precision of the resolver’sposiDonsensingduringdevelopment.