REXROTH IndraDyn S MSK series synchronous servo motor

Machine base number and length: determine the basic size and power range of the motor.

Rated speed: a four digit number representing the typical rated speed of the winding.

Cooling methods: NN (natural cooling), FN (liquid cooling), SA (only MSK133 axial fan).

Encoder type: S1/S2/S3 (single turn absolute value) or M1/M2/M3 (multi turn absolute value), with increasing accuracy and resolution.

Connector: Specify the position and type of power and encoder interfaces (such as side A/B, left and right L/R, rotatable U, or junction box RLK for high-power motors).

Axis type: G (optical axis, recommended to use keyless coupling kit) or P (shaft with keyway).

Brake options: 0 (none), 1, 2, 3 (different holding torques).

Special designs: NNNN (standard), RNNN (improved concentricity), NSNN (explosion-proof), etc.

When selecting, it is necessary to confirm each item and refer to the "Remarks" column in the manual to understand the availability limitations of specific combinations (such as some encoders being compatible only with specific designs).

Rich attachment ecosystem

Fan Unit (LEM Series): Provides axial or radial air cooling options for motors of size 060 and above, enhancing continuous output capability. The selection table provides a detailed list of fan models that can be matched with each motor model, as well as installation methods (factory pre installed or compatible kits). The electrical connection of the fan is divided into single-phase and three-phase, with integrated thermal protection.

Sealed air connection kit: used in humid or dusty environments, to clean and dry air by inputting micro positive pressure (0.1 ± 0.05 bar) into the motor to prevent pollutant intrusion, which can approximately increase the protection level to IP67. Please note that this method cannot prevent liquids (such as open gearbox oil) that persist at the shaft seal from seeping in due to capillary action.

Gearbox: It is recommended to use optimized gearboxes such as the Rexroth GTM/GTE series. If a third-party gearbox is used, a closed lubrication system must be used to avoid long-term contact of lubricating oil with the motor shaft seal.

Connection technology and electrical interface

MSK motors use standardized electrical interfaces to ensure easy and reliable connection.

Power connectors: RLS 110 with M23 interface is commonly used for small phone numbers, RLS 1200 with M40 for medium power, RLS 130 with M58 or RLK 1200/1300 for high power. The connector includes U/V/W motor phase wires, PE grounding, temperature sensor signals (MotTemp+, MotTemp -), and brake power supply (+24VBr, 0VBr).

Encoder connector: usually RGS1000 (rotatable) or RGS1003 (fixed) with M23 interface.

Rotating connectors: RLS 1100/1200 and RGS 1000 can adjust their direction within a certain angle range (such as ± 210 °) for easy wiring. When adjusting, coupling nuts must be used and the maximum rotational torque regulations must be followed.

Liquid cooled connection: MSK071/075 uses G1/8 pipe thread, MSK101 uses G1/8, MSK133 uses G1/4. When connecting, use a joint with an axial O-ring seal, strictly follow the prescribed tightening torque (such as 14-15 Nm for G1/8) and screw in depth operation to avoid damaging the motor threads. It is recommended to design the coolant circuit as a closed system.

Key operating conditions and application precautions

Environmental conditions: Standard data is based on ambient temperature of 0-40 ° C and altitude of 0-1000m. If exceeded, performance data should be reduced according to the derating curve (fT, fH) provided in the manual. The allowable vibration and impact loads are clearly defined based on the motor model and encoder type, and continuous impact load applications need to be evaluated separately.

Installation method: Supports IM B5 (flange installation), IM V1/V3 (flange installation, axis down/up), and IM B35 (with feet). When installing IM V3 (axially), it is necessary to ensure that there is no continuous accumulation of liquid at the shaft end. When installing the foot, only radial forces perpendicular to the installation surface (± 15 °) are allowed.

Shaft and bearing load:

Axial force: Each seat number has a clear maximum allowable value (such as 60N for MSK070).

Radial force: The allowable radial force is a complex function of the average rotational speed and the distance x from the point of force application. The manual provides detailed charts for querying the allowable radial force Fradial and maximum radial failure force Fradial_max based on speed, shaft type (optical axis/keyway), and point of action position. The actual radial force must never exceed Fradial_max.

Bearing lifespan: Under rated load and environmental conditions, the design lifespan L10h is 30000 hours. If the radial force is overloaded, the bearing life will be sharply shortened according to the formula L10h-red=L10h * (Fradial/Fradial-act) ^ (10/3).

Driver component installation: Keyless connection is recommended. If gears are used, the motor performance data needs to be reduced by 20-30%, and a closed lubrication gearbox must be used. The use of extremely rigid couplings or structures that cause over positioning installation should be avoided to prevent additional bearing stress.