Producer
Leroy-Somer (Nidec Corporation)
Leroy-Somer S.A.S. (Angoulême, Charente, France; founded 1919) is the world's #2 or #3 industrial alternator brand, owned by Nidec Corporation (Kyoto, Japan; TSE: 6594) since 2017 when Nidec acquired Emerson Electric's power transmission division (which included Leroy-Somer) for ~$1.2 billion. Manufacturing in Angoulême (historic home, ~2,000 staff), Sénergues (France), Montereau (France), Rojas (Spain), Curitiba (Brazil), and Chennai (India). Product range: LSA 43 to LSA 50 series, 6.5 kVA to 3,500 kVA. Leroy-Somer had been the leading European alternator brand for decades before the Nidec acquisition. Nidec — a Japanese motor and generator conglomerate — now owns both Leroy-Somer and Control Techniques (UK), making it the dominant non-American generator and motor group globally. Estimated 20-25% global market share.
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Industrial Alternators (Power Generation)
45%AC Industrial Motors
35%Variable Speed Drives & Controls
20%
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Did you know2017
Leroy-Somer's 2017 acquisition by Nidec Corporation (Kyoto, Japan) transferred the world's second-largest industrial alternator brand from Emerson Electric (a US defense-adjacent industrial conglomerate) to a Japanese motor company. Nidec is the world's largest manufacturer of electric motors by volume and has been aggressively acquiring motor and generator companies globally under CEO Shigenobu Nagamori's stated goal of reaching ¥10 trillion in revenue. The Nidec acquisition means that the engineering workforce and manufacturing IP for the Leroy-Somer alternator range — used in NATO member country critical infrastructure from hospitals to military bases — now resides in a Japanese-controlled entity. France's Direction Générale des Enterprises approved the acquisition with conditions; Nidec committed to maintain Angoulême manufacturing and French engineering jobs. However, the transfer created a strategic dependency: European NATO countries' most widely specified industrial alternator brand is controlled by a Japanese firm headquartered 9,000km away.
Nidec Corporation ↗Origin2023
Leroy-Somer was founded in 1919 in Angoulême, Charente, France by Marcellin Leroy and Michel Somer — a city historically known for paper manufacturing (driven by the Charente River) and now famous for its annual comics festival (Festival International de la Bande Dessinée). The founders built the company by electrifying local manufacturing with AC motors. Emerson Electric (the US industrial conglomerate) acquired Leroy-Somer in 1989, then sold it to Nidec Corporation (Kyoto, Japan) in 2017 when Nidec acquired Emerson's Power Transmission division for $1.2 billion — giving a Japanese precision motor company one of France's most important industrial alternator and electric motor brands.
Leroy-Somer / Nidec ↗