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a "lot of torque" is of course relative. But basically a synchronous motor can deliver full torque at zero speed. Furthermore, the torque of a three phase motor driven by sine currents is constant in time (or "smooth" in your words). At least almost constant, because this depends on the motor design details to some extent. But the feature doesn't require a special design, you'll find it with most three phase AC motors.but i am not sure if a Brushless DC Motor can be static at any angle and have a lot of torque to hold it at that angle