• Traditionally, solutions have based on purely mechanical transmission with the rotation ratio ensured by bevel gears.
• Machine sets and DC drives represent types of electrical solutions. 
• Today’s solutions generally involve DC bus systems installed with a range of connected inverters or frequency converters that are used to supply the most practicable squirrel-cage motors. 
• Connections between the drives are provided by fast communication bus systems, e.g. PROFIBUS.

Solutions for regulated drives

• The more straightforward and “conventional” types of regulated drives can be found in pumps, fans, machine tool spindles, and so on. These types are generally individual single-motor drives.
• Multi-motor drives with speed, synchronous or torque coupling between them can be found in paper machines, mills, rewinders, conveyors, etc.  

Technical resources used

SIEMENS offers a range of products for regulated drive projects, scaled according to maximum power and recommended purpose, and including appropriate internal software applications:

DC drives

• SIMOREG DC MASTER direct current converters (6RA70 range)
• Power range: 6 kW – 1900 kW
• Communication options: PROFIBUS, RS485, PEER2PEER
• Speed sensor: Internal IRC

Large AC drives with asynchronous motors

• SIMOVERT VECTOR CONTROL frequency converters
• Power range: 0.55 kW – 2300 kW (1/10/2003) 
• Communication options: PROFIBUS, PEER2PEER
• Speed sensor: Internal IRC

Conventional AC drives with asynchronous motors

• MICROMASTER or SINAMICS frequency converters
• Power range: 0.12 kW – 500 kW (1/10/2003)
• Communication options: PROFIBUS, RS485
• Speed sensor: IRC adapter

Basic designs

• COMPACT PLUS – space-saving
• Bus systems and individual solutions for lower powers
• COMPACT – closed inverter cabinet, up to approx.75 kW
• Open inverter for integration into distribution cabinets
• Switchboard – with open inverter and standard accessories; option of contactors, filters, etc.

Dynamic AC drives with servo motors

• SIMOVERT MOTION CONTROL frequency converters and ROTEC motors
• Power range: 0.55 kW - 250 kW
• Communication options: Extended; PROFIBUS, CAN adapters
• Speed sensor: Extended; IRC, ENCODER, RESOLVER adapters

Inverter accessories

• Supply and regenerative units
• Braking units and resistors
• Input and output inductors and filters; special filters