LM servo motors without encoders

LM Stober servo motor – synchronous electric motor with permanent magnets without an encoder. In the power range 0.74 – 8.1 kW. Rated torques max. 2.25 – 25.7 Nm. Rotational speed 3000 rpm. Efficiency 96%. IE5 energy efficiency according to IEC/TS 60034-30-2. Positioning accuracy +/- 1° with SC6 / SI6 servo drives. Protection class IP56/IP66. Optionally with a brake. Perfect replacement for an asynchronous motor.

LM servo motors without encoders

LM servo motors do not have a built-in encoder, but exhibit so-called anisotropic behavior, in which the winding inductance depends on the rotor position. The drive controller sends electrical signals through the motor windings and uses the received signals to calculate the motor rotor position. This allows LM type motors to be used as servo drives in applications where a positioning accuracy of ± 1° and a speed ripple of ≤ 1% are sufficient. The speed and torque of encoderless servo motors can be continuously regulated from standstill to maximum speed with full torque control.

Table of LM servo motors without encoders

Features of LM servo motors without encoder:

• Ideal replacement for asynchronous motors
• Higher energy efficiency compared to comparable IE4 asynchronous motors
• IE5 energy efficiency according to IEC/TS 60034-30-2
• Significantly lighter and more compact than comparable asynchronous motors
• Higher acceleration capacity than asynchronous motors
• More compact.
• Robust due to elimination of encoder.
• Resistant to vibrations and oscillations.
• Cheaper alternative to servo motors.
• Significantly more robust because there are no electronics in the motor.
• Full control of speed and torque at low speeds and standstill.
• Only standard power cable without additional encoder cables and shielding.
• Wiring limited to the power connection cable
• Freely rotatable power plug with quick connection
• No cooling required at low speeds.
• Speed ​​deviations less than 1%
• Cooperation with the motor controller – SI6 / SC6 servo drives
• Positioning accuracy +/-1° without encoder with SI6 / SC6 servo drives
• Protection class IP56, optional IP66
• Ambient temperature from -15 to + 40°C
• Thermal motor protection – integrated PTC thermistor
• Rolling bearings with permanent lubrication and non-contact seal
• Radial shaft seals made of FKM
• Optionally with spring-loaded safety brake
• The product complies with EU (CE), Great Britain (UKCA) and cURus directives

Various forms of output shafts of LM servo motors:

• solid shaft with key / solid smooth shaft
• pinion for direct mounting to Stoeber servo gear units