Inrunner vs outrunner motor – white paper

Inrunner motor vs outrunner motor

Every direct-drive torque motor has two main parts: a stator and a rotor. The stator is the stationary core that holds the coils and electric connections; the rotor is the dynamic rotating moving part containing the permanent magnets.

Definition
In inrunner motors, the stator is mounted within a frame, and the rotor is attached to a shaft or a rotating machine part inside the stator. The other way around is an outrunner motor. The stator stays stationary at the motor’s center, and the rotor, designed like a ring, spins around it. Each type has its advantages and disadvantages. This paper explores the performance, thermal resistance, and mounting of both inrunner and outrunner motors.

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