Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: How many phases of a hysteresis synchronous motor do not use a phase-shifting capacitor?, Context: Finally, hysteresis synchronous motors typically are (essentially) two-phase motors with a phase-shifting capacitor for one phase. They start like induction motors, but when slip rate decreases sufficiently, the rotor (a smooth cylinder) becomes temporarily magnetized. Its distributed poles make it act like a PMSM. The rotor material, like that of a common nail, will stay magnetized, but can also be demagnetized with little difficulty. Once running, the rotor poles stay in place; they do not drift.
Output:
one