Researchers at the U.S. Department of Energy’s Oak Ridge National Laboratory (ORNL) have developed a new electric motor drive design that could make powerful electric vehicles more reliable and longer-lasting.
The new technology reduces heat, electrical interference, and wear inside motor systems without adding any extra hardware.
The research could benefit large electric vehicles and machines that operate under demanding conditions, including electric aircraft, ships, and heavy-duty trucks.
These vehicles require powerful electric motors that can work continuously while remaining efficient and dependable.
An electric motor drive is the electronic system that controls how electricity flows from the battery to the motor.
It adjusts the speed and power of the motor, allowing the vehicle or machine to operate smoothly.
However, in high-power systems, unwanted electrical effects can develop inside the motor drive. These effects create extra heat, electrical noise, and stress on important components, which can shorten the life of the equipment.
One of the biggest problems is something called neutral-point current. This unwanted current creates excess heat inside the motor drive, making the system less efficient and increasing the risk of damage over time.
Another problem is common-mode voltage. This is stray electrical voltage that can interfere with electronic systems and gradually damage components such as motor bearings, insulation, and other sensitive parts.
Over time, these problems can increase maintenance costs and reduce system reliability.
To solve these issues, the ORNL research team developed a new way to control the motor drive. Their design uses two inverters that operate in opposite but carefully synchronized patterns. An inverter is an electronic device that converts electricity into the form needed to power an electric motor.
Because the two inverters work together in opposite directions, many of the unwanted electrical effects cancel each other out before they can cause damage. This greatly reduces the stress placed on the motor drive while keeping the same overall hardware design.
Computer simulations showed impressive improvements. The new design reduced neutral-point voltage fluctuations by about 90%. It also lowered the current stress on capacitors by 43%. Capacitors are important electronic components that store and release electrical energy, and reducing stress on them can help extend their operating life.
One of the biggest advantages of the new approach is that it does not require any additional parts. Instead, it improves performance by changing how the existing hardware operates. This keeps manufacturing costs lower while making the system more reliable.
According to ORNL researcher Gui-Jia Su, this type of solution becomes increasingly important as electric transportation systems continue to grow more powerful.
By reducing heat, electrical interference, and component wear, the new motor drive design could help future electric aircraft, ships, and heavy trucks operate more efficiently, require less maintenance, and remain in service for longer periods.
Source: Oak Ridge National Laboratory.
