Bosch SMG 180/120 electric motor: compact powerhouse

Powerful electric powertrain with up to 80 kW and extremely high efficiency in the urban cycle

  • 32-kilo lighter, reduced-volume motor
  • Immediate 200 Newton meters of torque
  • Four-wheel drive possible with axle-split hybrid

The Bosch SMG 180/120 is a compact powerhouse for use in electrical powertrains. The electric motor weighs only 32 kilos and fits inside a typical school backpack. This makes it considerably smaller and lighter than conventional combustion engines, yet it still packs an impressive punch. “The SMG 180/120 is the Bosch all-around solution for electromobility. It accelerates quickly over the first few meters and can be installed in electric vehicles as well as hybrids,” says Joachim Fetzer, who is in charge of electric vehicle and hybrid systems at Bosch. A look at current series-produced models which feature the motor shows just how versatile it is. Drivers can already experience the compact powerhouse in the smart “fortwo” electric drive and the Fiat 500e. But the permanent magnet synchronous motor can be used in hybrids as well. One example is the Peugeot 3008 diesel hybrid.

In hybrids, the electric motor supports the combustion engine with an output of up to 40 kW. In purely electric vehicles and plug-in hybrids, the SMG 180/120 delivers an output of 80 KW. The numbers only hint at the driving enjoyment this motor offers, however. The small motor delivers a driving experience of the kind that usually only associated with considerably more powerful combustion engines. Even at low engine speeds, the SMG 180 delivers up to 200 newton meters of torque. As soon as the driver steps on the gas pedal, this power is available. Yet at the same time, silent and relaxed gliding is possible.
Despite the power it develops, the electric motor works at over 90 percent efficiency. One unique selling point is that its efficiency has been optimized for urban traffic. As a general rule, the more efficiently an electric motor works, the greater the electric range of the vehicle.

Four-wheel drive and no need to check the oil
The compact motor's second strength is the level of comfort it offers drivers. As is typical for electric motors, the SMG 180 includes a start-stop function and regenerative braking. Even shifting is a thing of the past, since the motor operates with only one conversion ratio. At up to 12,800 revolutions per minute, the motor's output speed is flexible and covers the entire range of applications. And even when the car has to reverse, reverse gear is no longer engaged mechanically, but instead by changing the direction of electrical current.

In addition, the motor is maintenance-free. It contains no mechanical wear parts which must be regularly checked or replaced. And drivers are relieved of one other irksome task, namely checking oil levels and refilling engine coolant.

Finally, there is no predetermined location for the SMG in the powertrain. It does not have to be in close proximity to the combustion engine, but can be mounted on a vehicle's rear axle. This would allow a vehicle's front axle to be driven by the combustion engine while the rear axle is driven by the electric motor. Such a setup means that customers also get four-wheel drive functionality in their hybrid. One example of this type of axle-split hybrid is the Peugeot 3008 Hybrid4, which PSA and Bosch have already brought into series production.

Video link:
Electric drive
Axle-split hybrid

Tags: SMG 180, Motor, Electric, Compact

Mobility Solutions is the largest Bosch Group business sector. In 2018, its sales came to 47.6 billion euros, or 61 percent of total group sales. This makes the Bosch Group one of the leading automotive suppliers. The Mobility Solutions business sector pursues a vision of mobility that is accident-free. emissions-free, and fascinating, and combines the group’s expertise in the domains of automation, electrification, and connectivity. For its customers, the outcome is integrated mobility solutions. The business sector’s main areas of activity are injection technology and powertrain peripherals for internal-combustion engines, diverse solutions for powertrain electrification, vehicle safety systems, driver-assistance and automated functions, technology for user-friendly infotainment as well as vehicle-to-vehicle and vehicle-to-infrastructure communication, repair-shop concepts, and technology and services for the automotive aftermarket. Bosch is synonymous with important automotive innovations, such as electronic engine management, the ESP anti-skid system, and common-rail diesel technology.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 410,000 associates worldwide (as of December 31, 2018). The company generated sales of 78.5 billion euros in 2018. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT company, Bosch offers innovative solutions for smart homes, smart cities, connected mobility, and connected manufacturing. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to deliver innovations for a connected life. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 460 subsidiary and regional companies in over 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. The basis for the company’s future growth is its innovative strength. At nearly 130 locations across the globe, Bosch employs some 68,700 associates in research and development.

Additional information is available online at,,,

Still looking for something?