PacDrive 3 Lexium MH3 servo motors

Lexium MH3 servo motors provide excellent power density values to meet the requirements of compact machines. With four flange sizes and three different lengths for each flange size, they are suitable for many applications, covering a continuous stall range from 1.4 to 65 Nm (1.0 to 47.9 lbf ft) for speeds up to 6,000 rpm.  The Lexium MH3 servo motors have a medium inertia motor, which means they are particularly suitable for high-load applications.  They help to simplify installation and adjustment by providing robust adjustment of the movement. Lexium MH3 servo motors are UL Recognised and conform to UL1004 as well as European directives (marking). 

They are available with the following variants:

• 4 flange sizes: 70, 100, 140, and 190 mm (2.76, 3.94, 5.51, and 7.48 in.)
• Degree of protection:
  • IP 65 for the shaft end in accordance with IEC/EN 60529 (IP 67 with the conformity kit, which is available as an option)
  • IP 65 for the casing (IP 67 with the conformity kit, which is available as an option)
• With or without holding brake
• Elbow connectors for power and encoder connection
• Integrated single-turn or multi-turn SinCos Hiperface® encoder (medium or high resolution)
• Smooth or keyed shaft end

Special features
Lexium MH3 servo motors have been developed to comply with the following main specifcations:

• The ambient operating temperature is – 20…+ 40 °C /- 4…+ 104 °F without derating, in accordance with IEC 60721-3-3, category 3K3, and up to 55 °C /131 °F with derating of 1% of the nominal output power per additional °C above 40 °C /104 °F.
• The maximum operating altitude is 1,000 m /3,280 ft without derating, 2,000 m /6,561 ft with k = 0.86, and 3,000 m /9,842 ft with k = 0.8 (1).
• The relative humidity that the servo motor can withstand is in line with IEC 60721- 3-3, categories 3K3, 3Z12, and 3Z2.
• The windings are insulation class F (maximum temperature for windings 155 °C/ 311 °F) in accordance with IEC 60034-1.
• All mounting positions are permitted (horizontal mounting (IMB5) or vertical mounting (IMV1 with shaft end at the top and IMV3 with shaft end at the bottom) in accordance with IEC 60034-7.  Integrated encoder Lexium MH3 servo motors include an absolute encoder as standard equipment.

This encoder performs the following functions:

• Gives the absolute position of the motor to allow flow synchronization
• Measures the servo motor speed via the associated Lexium 52 / 62 servo drive (this information is used by the servo drive’s speed controller)
• Measures the position information for the servo drive’s position controller
• Sends data from the servo motor to the servo drive, which provides automatic identifcation of the motor when the servo drive starts

Four types of encoder are available:

• High resolution SinCos Hiperface® encoder:
• Single-turn (131,072 points/turn) (2)
• Multi-turn (131,072 points/turn x 4,096 turns) (2) These encoders give an angular shaft position that is precise to less than ± 1.3 arc minutes.
• Medium resolution SinCos Hiperface® encoder:
• Single-turn (32,768 points/turn) (2)
• Multi-turn (32,768 points/turn x 4,096 turns) (2)