what determines the speed of electric motors?
the speed of a motor is determined the amount of power and we all know that power is I2* R so the amount of current will affect it check DC Machines
The amount of current applied to the magnets in the motor.
The construction of the motor has a great influence on motor speed. A motor designed for DC or AC, the number of field poles vs armature windings. AC motors are typically synchronous and derrive there speed as a function of the electric frequency powering them. To adjust a speed of this type of motor a VFD (variable frequency Drive) is attached between the motor and its power source. The VFD changes the frequency and speed of the motor.
There are many types of motors. If its an ac induction motor (many ac motors are induction type) then the speed is determined by the frequency of the mains and the number of poles in the motor. This gives the speed that the magnetic field rotates, the actual shaft will be slightly slower and varies very slightly with load. For other motors the answer may be different.
