How do you read and use an electric motor efficiency map?

Motor efficiency maps plot efficiency as contours across torque (y-axis) and speed (x-axis) operating range. High efficiency regions (>95%) typically occur at moderate speeds and partial loads, with efficiency dropping at very low speeds, very high speeds, and maximum torque. Using efficiency maps, engineers optimize: Gear ratio selection to keep operating points in high-efficiency zones, regenerative braking strategy, multi-motor torque split in AWD vehicles, and predict energy consumption over drive cycles. Integration with inverter efficiency provides system-level optimization.