LTi LST/LSH series synchronous servo motor

LTi LST/LSH series synchronous servo motor

Model coding rules

Field meaning

LSX LSH / LST； H represents high performance, T is universal type; Six pole synchronous servo motor

074 machine base side length (mm): 037, 050, 074, 097, 127, 158, 190, 220

Core length code (1-5, the larger the number, the longer the core and the greater the torque)

30 rated speed × 100 → 30=3000rpm; 45=4500rpm

560 driver DC bus voltage: 24/48/320/560 VDC

Suffix options (can be combined) T0: Klixon temperature control switch; T1: PTC (standard); T4：KTY84‑130； B: 24VDC holding brake; P: Flat key DIN6885; X: Customized shafts/flanges/shells; S4: rotatable elbow joint; 1R/3R/5R: pole pairs of rotary transformers; G3/G5/G6/G12: SSI/EnDet absolute value encoder

Factory standard configuration: optical axis (without keyway), 1-pole rotary transformer 1R, T1 double insulated PTC thermal protection; Protection IP64 (excluding flanges).

LST series motor product positioning

LST is a universal six pole permanent magnet synchronous servo motor:

The stator winding has excellent heat dissipation and high overload capacity even in a static state;

The rotor inertia has been increased and optimized to facilitate torque matching;

The maximum speed can reach 9000rpm, and special windings can be customized;

The busbar version is divided into 320VDC and 560VDC; Machine base 037~220; The rated speed is often 3000rpm.

Allowable force on the shaft (20000 hour lifespan benchmark)

The radial force FRm acts at the midpoint of the shaft end; Vertical installation of V1 allows for axial force on the table; V3 axial installation, axial force needs to be deducted from rotor weight FG; radial and axial loads cannot be applied at full load simultaneously.

The table shows the maximum radial force, maximum axial force, and rotor weight FG of each machine base at different speeds of 1000-6000rpm. For example:

LST‑127：3000rpm， Radial 670N, axial 125N, rotor self weight 34N;

LST‑220：3000rpm， Radial 1700N, axial 320N, rotor self weight 200N.

Installation form: B5 flange horizontal; V1 flange facing downwards; V3 flange facing upwards.

Core electrical and mechanical parameters

4.1 Performance indicators include projects

Each motor provides: rated speed, rated frequency, bus voltage, rated torque Mn, locked rotor torque M0, peak torque Mmax; Rated/locked rotor/peak current; Power; Back electromotive force constant KE; Torque constant KT; Two phase winding resistance R2ph, inductance L2ph; No load speed n0; Electrical time constant Tel; Thermal time constant Tth; Rotor moment of inertia J; motor weight.

Taking LST-127-1-30-560 as an example:

Mn=5.7Nm，M0=6.6Nm，Mmax=19.8Nm；

Rated 4A, peak value 23A; power 1.79kW; maximum 9000rpm;

The rotor inertia is 0.0004   kg · m ², and the weight is 7.5kg.

Red curve Mmax: Short term peak torque (dynamic condition); Green curve M: Thermal allowable continuous output torque; The sample is accompanied by torque speed characteristic curves for each model.

4.2 External dimensions

Each machine base provides:

Total length of the rotary transformer version;

G3/G5/G12 optical encoder version total length;

G6 encoder version total length;

After adding the B brake, the additional dimension is extended;

Engineering drawings: flange, shaft diameter, keyway, joint position.

Encoder selection table

Compatible with rotary transformers, SSI absolute values, EnDat2.1 absolute values;

Important: Some models of G6.1/G6.2/G12. x cannot be paired with CDE3000 drives.

Characteristics of encoding option types

1R single pair polar rotation with 14 bit resolution, anti vibration

3R triple polar rotation resolution increased by 3 times

5R five pole rotation resolution increased by 5 times

G3 SSI multi cycle absolute value EQN1325 25 bit

G5 SSI Single Loop Absolute Value ECN1313 25 bit

G6.1S/M SRS50 single/multi turn 24 bit

G6.2S/M SKS36/SKM36 single/multi turn 21 bit

G12 series EnDat2.1 interface absolute value 23-25 bits

24V DC permanent magnet holding brake

Working principle: release when powered on, hold the brake when powered off; Only allow static braking; When used as an emergency stop brake, there is an upper limit WR for the allowable frictional work, and the actual braking torque will be lower than the nameplate holding torque MH.

Electrical: Release voltage 24VDC ± 10%; Different machine bases correspond to a release current of 0.33~2.1A.

Mechanical parameters: Maintain torque MH; Maximum allowable speed; Allowable frictional energy WR; Brake inertia JB; Brake weight.

Installation position: The brake is installed on the flange side (A side) of the motor to ensure maximum holding torque.

Wiring suggestion: It is recommended to turn off the DC side of the brake to achieve shorter tripping/closing time and improve the safety of the lifting mechanism; The sample provides a schematic diagram of the timing sequence of the brake (t1 suction time, t2 disconnection time).

Attention: The holding brake is used to maintain the brake and is not suitable for long-term dynamic braking; Emergency shutdown requires calculating the upper limit of WR friction energy.

Key points for matching with drivers

Rotary transformer 1R/3R/5R → CDE driver X6 interface; The CDB driver does not support Resolvers;

SSI/G3/G5 → CDE/CDB X7 (TTL SSI encoder port);

G6/G12 EnDat encoder: Confirm if the driver hardware supports it, CDE3000 does not support some models;

Connect the PTC/KTY temperature sensor of the motor to the X3 terminal of the driver;

Motor brake B option: CDE driver X9 terminal (maximum 2A output) directly drives the brake; The CDB driver does not have an independent brake output and requires an external relay.