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LTN resolver

LTN resolver

Product catalog summary

Specifications:
The document provides specifications for two resolver models, RE-15 and RE-21, manufactured by LTN Servotechnik GmbH. Key specifications include:

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

Operating Principle:
The resolver functions as a rotary transformer providing rotor position angle information. The stator winding is energized with an AC voltage, which is transferred to the rotor winding with a transformation ratio. The output voltages vary with the sine and cosine of the rotor position angle.

Accuracy:
Accuracy is defined as the difference between the electrical angle indicated by the output voltages and the mechanical angle. The document details accuracy absolute, accuracy spread, and accuracy ripple, with the latter affecting speed stability at low speeds. LTN resolvers achieve low accuracy ripple through a patented lamination assembly process.

Selection Guide:
The document includes a selection guide for electrical data, detailing various models with different pole pairs, transformation ratios, input voltages, currents, frequencies, and phase shifts. It also provides impedance and resistance values for different models.

Mounting Dimensions:
The document provides mounting dimensions for both RE-15 and RE-21 models, specifying inner and outer diameters and positive counting direction.

Ordering Information:
The ordering information section explains the coding system for specifying electrical values, shaft diameters, standard shapes, customer-designed resolvers, pole pairs, and frame sizes.

Contact Information:
LTN Servotechnik GmbH is located in Otterfing, Germany, with contact details provided for further inquiries.

Catalog excerpts

Hollow shaft : 12 mm max. Outer ؘ: 36.8 mm Length: 16 mm Hollow shaft : 17 mm max. Outer ؘ: 52.4 mm Length: 26 mm > Operating temperature: 55ְC ... +155C Permissible speed: 20,000 rpm max. Accuracy absolute: б4/ұ6/ұ10 Accuracy ripple: 1Ғ max. Rotor and stator completely impregnated 1/2/3/4 pole pairs >

Open the catalog to page 1

A resolver is a rotary transformer that providesinformation on the rotor position angle induces the voltages E S1-S3 and E S2-S4 into the two outputwindings of the stator.The magnitude of the output voltages vary with the sineand the cosine of the rotor position angle θ .The stator bobbin winding is energized with an ACvoltage E R1-R2 . This AC voltage is transferred to the rotorwinding with transformation ratio θ , because thetwo secondary windings are shifted by 90. Tr . The AC voltage then Input:E > R1-R2 Output:E > S1-S3 E > S2-S4 Input Signal:E > R1-R2 = E > sin( Џ t) Output Signal:E > S1-S3...

Open the catalog to page 2

The accuracy ε is defined as the difference between theelectrical angle accuracy absoluteђ or the accuracy spreadђ iscaused by the internal error of the resolver and the mounting error resulting in 1st and 2nd order harmonicsof the sinusoidal signal.At low speeds the θ > el , indicated by the output voltages of thesecondary windings, and the mechanical angle or rotorposition angle θ > mech .accuracy ( accuracy rippleђ effects the speedstability of a drive. This ripple is caused by 3rd andhigher order harmonics. To ensure smooth drive performance even at low speeds LTN resolvers have anaccuracy...

Open the catalog to page 3

Inner diameter stator = 22.800 min.Outer diameter rotor = 22.325 max.Positive counting direction:Rotor cw as viewed from bobbin end (X )Dimensions in mm > Inner diameter stator = 22.800 min.Outer diameter rotor = 22.325 max.Positive counting direction:Rotor cw as viewed from bobbin end (X )Dimensions in mm >

Open the catalog to page 5

Inner diameter stator = 33.470 min.Outer diameter rotor = 32.735 max.Positive counting direction:Rotor cw as viewed from bobbin end (X )Dimensions in mm > Inner diameter stator = 33.470 min.Outer diameter rotor = 32.735 max.Positive counting direction:Rotor cw as viewed from bobbin end (X )Dimensions in mm >

Open the catalog to page 7

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