A_AP_MR0008E01©2019HIOKIE.E.CORPORATION.

■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.