Starter Generators (ISG)
All of Innotec’s generators can be configured as starter generators. These include the engine-mounted line of generators, pulley-driven line of generators or direct shaft coupled units.
ISG Basics
ISGs are devices used to start an engine as well as act as a generator. The benefit of using this technology is that it removes the need for a separate starter motor to start up an engine, thus reducing components as well as space usage. Starter generators serve the purpose of three components:
- Starter- to start up an engine
- Electric motor- to power AC, water pump, etc.
- Alternator- to recharge batteries
Depending on engine selection, the starter generator can be configured to fit with a minimal profile and reduce space compared to standard alternators.
Components of the ISG (integrated starter generator):
The main components include the stator/housing, rotor and controller(s). The generator may need specific sensors to work in starting or generating functions.
Stator
Rotor
Controller
Working:
While starting up an engine, the ISG unit receives energy from the battery. The stator receives energy from the battery and causes rotation of the rotor, which then cranks up the engine. After the engine starts, the crankshaft rotation causes the rotor to rotate, which produces an electric current in the stator and this electric energy is used to recharge the battery. Thus, ISG is a bi-directional power transfer system. Innotec’s generators can be used bi-directionally mechanically as well.
ISGs are used in HEVs (Hybrid electric vehicles) and MHEVs (Mild hybrid electric vehicles), as they result in reduced fuel consumption and improved performance. The most common variants include
To control and manage the function of the ISG as a starter and a generator, a controller is used, which helps the ISG system communicate with the engine via hall effect sensors or sin/cos sensors. Various features of the controller include:
Over-current protection
Over/under voltage shut-off
Temperature check
Communicating with the engine
Battery current control
Battery charging control
Advantages of Using Starter Generators
Starter generators offer a compact and integrated solution for both starting and generating power, eliminating the need for separate alternators and starter motors. This not only reduces the total system weight but also minimizes wiring complexity and overall system cost. In automotive and industrial applications, this integration leads to better space utilization, faster start-stop performance, and enhanced power delivery efficiency. For OEMs, the ability to use a single unit as both a starter generator for engine ignition and as a starter alternator for power generation offers an attractive alternative to conventional systems.
Applications of Starter Generator Systems
Starter generator systems are widely adopted in electric and hybrid powertrains, auxiliary power units (APUs), off-highway vehicles, construction machinery, and aerospace systems. In the automotive sector, particularly in MHEVs and HEVs, ISGs contribute to smoother engine restarts, regenerative braking, and extended battery life. In the aerospace industry, lightweight starter generator motors are essential in APUs for starting turbine engines and supplying electrical power during flight. In agriculture and defense, rugged ISG units support engine starting in remote or harsh conditions where reliability is critical.
Starter Generator Voltage Options & Customization
At Innotec Power, we provide ISGs in multiple voltage ratings, including 24V, 48V, 96V, 240V, 300V and 400V, making them compatible with a wide range of applications. Our engineering team can tailor the starter generator configuration to fit unique mounting requirements, shaft styles, cooling systems, or torque ratings. For instance, a 48V starter generator may be ideal for battery-assisted agricultural equipment, while a 400V ISG would be more suitable for high-performance hybrid or electric vehicles.
Why Choose Innotec Starter Generators
Innotec Power’s starter generators are built with a focus on reliability, efficiency, and scalability. Whether you need an engine-mounted starter generator, a belt-driven starter alternator, or a shaft-coupled ISG, our solutions are engineered to deliver consistent performance in demanding conditions. Our units feature high-efficiency PMSM technology, sealed enclosures for environmental protection, and can be integrated into electric drivetrains or hybrid propulsion systems with minimal adaptation.