Resolver
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Resolver RE-15 Hollow shaft Ø: 12 mm max. Outer Ø: 36.8 mm Length: 16 mm RE-21 Hollow shaft Ø: 17 mm max. Outer Ø: 52.4 mm Length: 26 mm Main features Operating temperature: –55°C ... +155°C Permissible speed: 20,000 rpm max. Accuracy absolute: ±4’/±6’/±10’ Accuracy ripple: 1’ max. Rotor and stator completely impregnated 1/2/3/4 pole pairs

Operating Principle A resolver is a rotary transformer that provides information on the rotor position angle 9. The stator bobbin winding is energized with an AC voltage ERLR2. This AC voltage is transferred to the rotor winding with transformation ratio Tr. The AC voltage then induces the voltages Esi-s3 and Es2-s4 into the two output windings of the stator. The magnitude of the output voltages vary with the sine and the cosine of the rotor position angle 9, because the two secondary windings are shifted by 90°. Primary side Secondary side Stator Rotor, totor/ State blue yellow Input...

Accuracy The accuracy ε is dened as the difference between the The ‘accuracy absolute’ or the ‘accuracy spread’ electrical angle θel, indicated by the output voltages of the is caused by the internal error of the resolver and the secondary windings, and the mechanical angle or rotor mounting error resulting in 1st and 2nd order harmonics position angle θmech. accuracy (ε) = electrical angle (θel ) – mechanical angle (θmech) At low speeds the ‘accuracy ripple’ effects the speed stability of a drive. This ripple is caused by 3rd and higher For each LTN resolver the accuracy is indicated in...

Resolver RE-15: Selection Guide for Electrical Data Various mechanical versions available Basic Model Primary Side Pole Pairs Transformation Ratio Input Voltage Input Current Input Frequency Null Voltage D.C. Resistance (± 10%) Rotor Stator Accuracy Ripple Operating Temperature –55°C ... +155°C Max. Permissible Speed 20,000 rpm Shock (11 ms) Vibration (10 to 500 Hz) ≤ 500 m/s2 Weight Rotor/Stator Rotor Moment of Inertia 0.02 × 10 Hi-pot Housing/Winding Hi-pot Winding/Winding Completely impregnated Completely impregnated The selection guide and the mounting dimensions Housed bearing-type...

Resolver RE-15: Mounting Dimensions displacement rotor/stator Inner diameter stator = 22.800 min. Outer diameter rotor = 22.325 max. Positive counting direction: Rotor cw as viewed from bobbin end (X <-) displacement rotor/stator Inner diameter stator = 22.800 min. Outer diameter rotor = 22.325 max. Positive counting direction: Rotor cw as viewed from bobbin end (X <-)

Resolver RE-21: Selection Guide for Electrical Data Various mechanical versions available Basic Model Primary Side Pole Pairs Transformation Ratio Input Voltage Input Current Input Frequency Null Voltage D. C. Resistance (± 10°) Rotor Stator Accuracy Ripple Operating Temperature –55°C ... +155°C Max. Permissible Speed 20,000 rpm Shock (11 ms) Vibration (10 to 500 Hz) ≤ 500 m/s2 Weight Rotor/Stator Rotor Moment of Inertia 0.14 × 10–4 kgm2 Hi-pot Housing/Winding Hi-pot Winding/Winding Completely impregnated Completely impregnated The selection guide and the mounting dimensions Housed...

Resolver RE-21: Mounting Dimensions displacement rotor/stator Inner diameter stator = 33.470 min. Outer diameter rotor = 32.735 max. Positive counting direction: Rotor cw as viewed from bobbin end (X <-) displacement rotor/stator Inner diameter stator = 33.470 min. Outer diameter rotor = 32.735 max. Positive counting direction: Rotor cw as viewed from bobbin end (X <-)

1... 9 Electrical values 0... 9 Shaft diameter A... D Standard shapes E... Z Customer designed resolvers LTN Servotechnik GmbH Georg-Hardt-Straße 4 D-83624 Otterng Germany Tel: +49 - (0)8024-6080-0 Fax: +49 - (0)8024-6080-100 E-Mail: LTN@LTN.de Internet: www.LTN.de Printed in Germany ⋅ Subject to change without prior notice ⋅ Issued 09/2005