Configuration Manual, Synchronous Built-in Motors 1FE1 - Siemens ...

Description of the Synchronous Motor
1.1 Features, system prerequisites
Accuracy
1-20
The precision of a motor spindle is defined on one hand by the mechanical design
and on the other hand by the control technology and the encoder resolution.
Mechanical system
The machining precision of the spindle that can be achieved is influenced, in addition
to the system stiffness (housing, bearings, spindle), also by its smooth running
properties. The spindle manufacturer is responsible for the implementation and
proving the corresponding performance.
!
Warning
Static charging of the rotor:
At higher speeds, depending on the spindle design as well as the properties of the
spindle bearings (e.g. grease and minimum oil lubrication), the rotor can be
statically charged--up! The spindle manufacturer must apply the appropriate
counter--measures.
If ceramic bearings are used, the motor shaft must be grounded as otherwise
arcing could occur between the shaft and the sensor housing!
Closed -loop control
The decisive closed--loop control factors include:
S The number of encoder signals per spindle revolution
S The precision when mounting and adjusting the encoder system
S The multiplication of the encoder signals
S The sampling time of the current and speed controller
In conjunction with the Performance control (closed--loop) of SIMODRIVE 611 digital,
the motor spindle is suitable for C--axis operation.
Degree of protection
The motor components have degree of protection IP00.
The final degree of protection is determined by the mechanical design of the
spindle housing of the particular manufacturer. Protection against coming into contact,
foreign bodies and water for electrical equipment is specified in accordance
with DIN IEC 60034, Part 5.
Recommendation: IP54 (minimum degree of protection)
Magnetic excitation
Forces occur between the rotor and stator of electrical motors due to the inherent
magnetic principle of operation.
These forces must be able to be absorbed by the surrounding mechanical assembly.
In order to avoid exciting vibration, the motor spindle (spindle shaft, bearings,
spindle housing) should be designed to be as stiff as possible.
Synchronous Built-in Motors 1FE1
Configuration Manual (PJFE), 09/2008, 6SN1197 -0AC00 -1BP0