Deep in the electric-vehicle industry’s supply chain is a little-known Japanese manufacturer that makes a seemingly mundane, but essential, device: coil-winding machines.

If the motor is the heart of an EV, then coils in turn are the heart of the electric motor. Odawara Engineering Co., founded 70 years ago as a supplier for appliance-makers, is an expert in making the dense loops of wire that go into those motors. Tesla Inc., manufacturer of the Model S and Model 3 sedans and most recently the world’s most-valuable automaker, is one of its biggest customers.

Although the coronavirus pandemic has depressed global auto sales, BloombergNEF predicts that economies will speed up adoption of EVs as some countries choose to bolster funding for low-emission cars and infrastructure. The global market for coil-winding machines is projected to expand at 10 percent annually and will reach $1.3 billion in 2024, according to Global Info Research.