Siemens SINAMICS G130 Engineering Manual page 521

1LL1 self-ventilated motors – open version
1LH1 water-cooled motors with water-jacket cooling
The SIMOTICS FD motor series offers the possibility for creating a perfectly optimized drive system comprising a
SINAMICS converter and a SIMOTICS motor with regard to different criteria. The main criteria to be considered
include:
• Optimum voltage utilization
• Low noise emissions
• Low temperature rise / increased efficiency
For optimum dimensioning of the motor for converter-fed operation with respect to voltage utilization, noise emissions
and temperature rise / increased efficiency, the following aspects must be taken into account:
• Type of Infeed of the SINAMICS converter
(Basic Infeed, Smart Infeed, Active Infeed)
• Maximum achievable voltage at the converter output / motor as a function of the modulation system
(space vector modulation or optimized pulse patterns)
• Pulse frequency of the converter
• Required rated speed
• Required rated output, cooling method and degree of protection of the motor
Optimum voltage utilization
Depending on the type of SINAMICS Infeed, it is possible to choose between motors with rated voltages that are
either lower than the line voltage (for unregulated Basic Infeeds and Smart Infeeds), or higher than the line voltage
(for regulated Active Infeeds). The motor can then make optimum use of the maximum output voltage delivered by
the converter and is not forced (unlike many other conventional converter/motor combinations) to operate in the field-
weakening range below the nominal working point, which would result in increased current and thus in a
correspondingly overdimensioned motor design.
Engineering Information
1LP1 forced-air cooled motors – open version
Water-cooled 1LN1 motors with air-to-water heat exchanger
SINAMICS Engineering Manual – November 2015
Motors
521/528
Ó Siemens AG