Split Phase Start: Motor which employs a main winding and an auxiliary winding, which is called the starting winding. The windings are unlike and thereby 'split' the single phase of the power supply by causing a phase displacement between the currents of the two windings thus producing a rotating field. After the motor has attained approximately 75% of rated speed, the starting winding is automatically disconnected by means of a centrifugal switch or by a relay. The motor then continues to run on a single oscillating field, which in conjunction with the rotation of the rotor, results in a rotating field effect. Since there is no rotating field, after the starting winding is de-energized, the rotation cannot be changed until the motor has come to rest or at least slowed down to the speed at which the automatic switch closes. Special starting switches are available as well as special reversing switches which have a means for shunting the open contacts of the automatic switch while the motor is running and thus permits the split phase motor to be reversed while rotating. This type of starting is found typically on single phase fractional motors.

 

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Split Phase Start: Motor which employs a main winding and an auxiliary winding, which is called the starting winding. The windings are unlike and thereby 'split' the single phase of the power supply by causing . . . View Full Definition

Capacitor Start: The capacitor start single phase motor is basically the same as the split phase start, except that it has a capacitor in series with the starting winding. The addition of the capacitor provi . . . View Full Definition

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