Electric and hybrid
How Is EV Motor Torque Delivered to the Wheels?
Learn how EV motor torque reaches the wheels through the reduction gear, differential, and axle shafts, and what this torque path means for everyday driving.
Electric and hybrid Page 6
Batteries, charging, range and living with electrified cars.
Electric and hybrid
Electric and hybrid
What Is a Motor Efficiency Map? Speed, Torque, Losses and Calibration
Learn what a motor efficiency map shows, how speed and torque define it, where electric motor losses come from, and how EV calibration uses the map.
Electric and hybrid
Why Does an EV Make a Whine When Accelerating?
Learn why an EV whines when accelerating: inverter and motor frequencies, reduction gear noise, what sounds are normal, and when to have the drive unit checked.
Electric and hybrid
What Is an EV Motor Resolver? Rotor Position, Torque Control and Faults
Learn what an EV motor resolver is, how this electric motor resolver sensor tracks rotor position for precise torque control, and which faults can affect it.
Electric and hybrid
How Does an EV Inverter Adjust Motor Speed?
Learn how an EV inverter controls motor speed by changing AC frequency and voltage, and how it turns the driver's pedal input into a torque request.
Electric and hybrid
What Is Motor Field Weakening? How EV Motors Reach High Speed
Learn what motor field weakening is, why EV motors use it above base speed, how torque changes in that range, and how the inverter controls it.
Electric and hybrid
Why Do Some EVs Have More Than One Motor?
Why some EVs use two or more motors: independent axle control, better traction on slippery roads, and the efficiency trade-offs behind a dual motor EV layout.
Electric and hybrid
What Is an EV Drive Unit? Motor, Inverter and Reduction Gear Explained
Learn what an EV drive unit is, how the electric motor, inverter and reduction gear work together, and what that means for ownership, service and repairs.
Electric and hybrid
Why Do EV Motors Need Cooling? Losses, Heat Paths and Power Limits
Learn why EV motors need cooling: where electrical losses create heat, how it leaves the motor and inverter, and why temperature limits sustained power.
Electric and hybrid
What Is a Wound-Rotor EV Motor? Excitation, Control and Packaging Explained
A wound-rotor EV motor uses a DC-fed copper rotor winding instead of permanent magnets. Learn how its excitation, inverter control and packaging work.
Electric and hybrid
What Is an Induction EV Motor? Rotor Current, Field, and Control
Learn how an induction EV motor works: induced rotor current, the rotating magnetic field, slip, and inverter control, plus practical trade-offs for owners.
Electric and hybrid
What Is a Permanent-Magnet EV Motor? Rotor Magnets, Efficiency and Materials
A permanent-magnet EV motor uses magnets in its rotor instead of induced currents. Learn how the rotor magnets work, why the design is efficient, and which materials it uses.
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