REXROTH IndraDyn S MSK series synchronous servo motor

REXROTH IndraDyn S Series MSK Synchronous Servo Motor Application Guide

Introduction

In the field of modern industrial automation, high-precision, high dynamic response, and high reliability servo drive systems are the embodiment of core competitiveness. The IndraDyn S series MSK synchronous servo motor under Bosch Rexroth has established a benchmark position in key industries such as machine tools, printing, packaging, and robotics with its wide power spectrum, fine machine base number grading, and maximum torque of up to 631 Nm. This guide aims to provide a comprehensive technical review and application analysis of this series of motors based on the official project planning manual, offering a one-stop professional reference for design, selection, installation, and maintenance personnel.

Product Overview and Design Concept

The MSK series motor is a permanent magnet synchronous servo motor, whose core design concept is to achieve extremely high torque density and compact structure. The motor has a standard protection level of IP65 and integrates a temperature sensor to ensure reliability in harsh industrial environments. The series covers various machine base numbers from MSK030 to MSK133, with different lengths (such as B, C, D, E, etc.) and winding versions under each base number to meet various application needs from light load high-speed to heavy load low-speed.

The motor provides various cooling methods such as natural cooling (NN), air cooling (through axial or radial fan units), and liquid cooling (FN). Among them, the liquid cooling design is specifically designed to meet the application scenarios of extremely high sustained power demand, significantly improving thermal management efficiency. All air-cooled units comply with the "Thermally Protected F" standard, eliminating the need for external motor protection switches and simplifying system design.

Core technical characteristics and data interpretation

Performance parameters and working system: The motor technology data is provided based on two temperature rise models: a shell temperature rise of 60K (Δ T=60K) and a winding temperature rise of 100K (Δ T=100K). The former is suitable for motor insulation installation scenarios, while the latter is suitable for non insulation scenarios installed on steel flanges. The manual clearly states that in order to ensure the accuracy of the machine tool, it is recommended to use 60K data for system planning. The performance curve conforms to the S1 (continuous duty cycle) or S3 (intermittent cycle duty cycle) duty cycle of EN 60034-1 standard, with a typical load duration (DC) of 25% for S3.

Detailed explanation of key parameters:

Continuous locked rotor torque and current (M0, I0): Refers to the long-term output torque and corresponding effective value of phase current of the motor when the speed n ≥ 0.1 Hz. This is the benchmark for the continuous working ability of the motor.

Maximum torque and current (Mmax, Imax): The peak torque and current that a motor can output in a short period of time (about 400ms) determine its acceleration and overload capabilities.

Torque constant and back electromotive force constant (KM, KEMK): They respectively characterize the ability of current to generate torque and the ability of rotation to generate induced voltage, and are key to controller matching and voltage demand calculation.

Thermal time constant (Tth): The time required for the casing temperature to rise to 63% of the final steady-state temperature rise when the motor load reaches the allowable S1 continuous torque. For example, some models can last for more than 90 minutes under natural cooling, and require sufficient cooling after shutdown before they can be touched.

Encoder system: Provides multiple high-resolution encoder options, including single/multi turn absolute value type (Hiperface, EnDat 2.1 interface). For example, the M1 multi turn absolute value encoder can achieve absolute position recording within a mechanical rotation range of 4096 turns, and the position information is not lost after power failure, greatly simplifying system debugging and improving reliability. The position resolution depends on the number of encoder lines, controller resolution, and number of distinguishable turns.

Maintain brake: As an optional accessory, provide electromagnetic release brakes with different holding torques. Strict compliance with safety regulations is required: This brake is only used to maintain the stationary shaft when the controller is enabled to close, and cannot be used as a working brake or personnel safety brake. For vertical axes, the risk of falling must be prevented through mechanical locking, external braking/clamping devices, or sufficient weighting. The holding torque of the brake (M4) needs to be regularly checked and 'run in', which can be achieved manually or by driving the controller software function (such as IndraDrive's C3900 command).

Detailed model coding and selection process

The model code of MSK motor is the only basis for precise ordering, and its structure systematically defines all the characteristics of the motor. The basic structure of encoding is: MSK [machine base number] [length code] - [rated speed] - [cooling method] - [encoder type] - [connector direction/type] - [shaft type] [brake option] - [special design].