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The torque-speed (τ−ω) curves for different stator numbers ( N = 1 to N = 8) from our model. Two regimes of the τ−ω curves, i.e., constant τ up to a large knee speed ωn and fast decrease of τ to zero at the maximum speed ωmax, are evident for all stator numbers. The torque per stator τ/N versus the speed ω is shown in Inset. The torque at stall scales with N whereas the maximum speed is independent of N.
