Hi, I need help with these 3 questions?

1º when it is more in danger of overheating, the field circuit of a synchronous motor, when it operates with a delayed or forward power factor?

explain through fasorial diagrams

2º A synchronous motor operates with a fixed real load and its field current is increased, if the current falls in the armature. Did the motor initially operate with a power factor in advance or in delay?

3ºWhy should the voltage applied to a synchronous motor be degraded to operate at frequencies lower than the nominal frequency?

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