Efficient heavy-duty three-phase synchronous generator

Efficient heavy-duty three-phase synchronous generator

The permanently excited synchronous generators DSG P convert a rotary motion into electrical energy with little loss. They offer particularly high efficiency in this energy conversion.
The generators have a high power density at low weight and, apart from the ball bearings, have no wearing parts.
The generators can be designed to meet requirements in terms of special voltage, design and shaft ends.
A typical application for synchronous generators is the provision of on-board voltage in trains.

Efficient

The permanently excited synchronous generators DSG P are characterized by a particularly high level of efficiency.

• High power density
• Low weight
• Optimum efficiency, especially at part load
• Very good price-performance ratio
• Optimum energy yield even at low speeds
• Low starting torque due to reduced detent torque

Flexible

Thanks to their compact design, the permanently excited DSG P generators can be optimally integrated into new and existing systems.

• Dynamic braking possible to decelerate installation
• Avoids the need for an additional brake system (e. g. for wind power), which simplifies type testing
• Lack of reactive power relieves grid and power distribution loads
• Individual designs and shaft ends to meet different application needs

Reliable

The permanently excited synchronous generators DSG P offer a long service life and high system availability.

• Robust design for harsh environmental conditions
• Low thermal stress thanks to permanent excitation
• Reduced detent torque optimizes operating characteristics and reduces noise
• Reduced excitation causing installation vibration

Tailor-made

On request the permanently excited synchronous generators DSG P can be individually calculated and designed.

• Customer-specific design
• Customer-specific voltage output
• Test stand measurements
• After-sales service and advice on specific questions

Operating principle of the three-phase synchronous generators

Application for power feedback into an existing supply network

Feeding the generated power into an existing supply network requires an inverter that feeds the rectified voltage from the synchronous generator into the supply network at the correct frequency and amplitude.

Application for charging a battery

Feeding power into a battery requires a charge controller that feeds the rectified synchronous generator’s voltage to the battery at the correct charging current, and performs the monitoring function for the battery to prevent overcharging.

Performance summary DSG P synchronous generators

DSG P three-phase synchronous generators are available with a wide range of possible output powers.

Application examples

Auxiliary Power Unit (APU) with diesel engine and generator for energy supply

The use of three-phase synchronous generators enables fuel savings
by switching off the main diesel engine of vehicles during a stop. A separate, smaller diesel engine for the on-board network supplies the generator and air conditioning compressor when stationary. This avoids high no-load losses.
A three-phase synchronous generator ensures the reliable supply of energy to the on-board network of trains, cable cars and other vehicles in stationary operation.

Three-phase synchronous generators in the production of hydroelectric power

The use of a three-phase synchronous generator interacting with a water turbine
offers a number of advantages:

• The permanently excited generator operates over a very wide speed range and supplies power to the inverter.
• The efficiency of the synchronous generator is very high, particularly in a wide range of part-load operations.
• Even when the water flow is low, the generator is driven and feeds electrical power into the grid via an inverter.
• The financial income (feed-in tariff payments) for the user is maximized, the higher initial costs are amortized more quickly.

Three-phase synchronous generators in the production of wind power

The use of a three-phase synchronous generator in small wind turbines offers advantages over conventional systems:

• Design for maximum efficiency of the generator with the existing turbine properties and power using measured characteristic data of the generator
• Low starting torque enables start-up even at low wind speeds
• Optimum energy yield through energy generation over a wide speed range

Permanently excited synchronous generators as pilot exciters

Main generators, for example in power plants or gas liquefaction plants, need an excitation current to start, which they receive from the main excitation machine. The main exciter is a generator that is not permanently excited and therefore requires an exciter current to start, which in turn is supplied by a pilot exciter.
A solid or hollow shaft, permanently excited three-phase synchronous generator is an ideal pilot exciter machine that can power the main exciter machine at any time once the overall system is rotating.
A possible application is a black start (emergency start) after a complete failure of the main electrical supply. The permanently excited three-phase synchronous generator provides the main exciter machine with an exciter field from the available rotary motion and thus ensures the emergency power supply.