BMH 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 1.2 to 84 Nm for speeds up to 8,000 rpm.
The new BMH servo motors have a medium inertia motor, which means they are particularly suitable for high-load applications. They help to simplify installation and adjustment through a more robust adjustment of the movement.
BMH servo motors are UL Recognizedand conform to UL 1004 standards as well as to European directives (CE marking).
They are available with the following variants:
- 5 flange sizes: 70, 100, 140, 190 and 205 mm
- 2 degrees of protection for the shaft end: IP 50 or IP 65 (IP 67 with the conformity kit, which is available as an option) in accordance with standard IEC/EN 60529. The degree of protection of the casing is IP 65 (IP 67 with the conformity kit, which is available as an option)
- With or without holding brake
- Straight or angled connectors for power and encoder connection
- Integrated SinCos Hiperface, single turn or multiturn encoder (medium or high resolution)
- Untapped or keyed shaft end
Special features
BMH servo motors have been developed to comply with the following main specifications:
- The ambient operating temperature is - 20...+ 40°C without derating, in accordance with standard IEC 60721-3-3, category 3K3, and up to 55°C with derating of 1% of the nominal output power per additional °C above 40°C.
- The maximum operating altitude is 1000 m without derating, 2000 m with k = 0.86 and 3000 m with k = 0.8 (1). The relative humidity that the servo motor can withstand is in line with standard IEC 60721-3-3, categories 3K3, 3Z12 et 3Z2.
- The windings are insulation class F (maximum temperature for windings 155°C) in accordance with standard IEC 60034-1.
- The thermal protection is provided and controlled by the Lexium 32 servo drive via the motor temperature control algorithm.
- 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 standard IEC 60034-7.
Holding brake
BMH servo motors can be equipped with a failsafe electromagnetic holding brake.
Do not use the holding brake as a dynamic brake for deceleration, as this will quickly damage the brake.
Integrated encoder
BMH servo motors are equipped as standard with an absolute encoder.
This encoder performs the following functions:
- Gives the absolute position of the motor so that fl ows can be synchronized
- Measures the servo motor speed via the associated Lexium 32 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 ensures automatic identification of the motor when the servo drive starts
Four types of encoder are available:
- High resolution SinCos HiperfaceR encoder:
- Single turn (131,072 points/turn) (1) or
- Multiturn (131,072 points/turn x 4096 turns) (1), ensuring angular precision of the shaft position, accurate to less than ± 1.3 arc minutes
- Medium resolution SinCos HiperfaceR encoder:
- Single turn (32,768 points/turn) (1) or
- Multiturn (32,768 points/turn x 4096 turns) (1), ensuring angular precision of the shaft position, accurate to less than ± 4.8 arc minutes.
