Kelley8
Electrical
- Oct 27, 2003
- 15
I have an old (pre-1970) 15Hp GE motor (sf-1.15, FL Rpm-1770, 550V, FLA-15Amps, Type-K, Nema Design-B, Frame-324Z, Code-G, Insul.-B) that part of a 7.5KVA motor-generator configuration.
Attached to the motor end of the shaft is a 430lb. flywheel that provides 260lbs-ft2 of inertia. The flywheel is a design feature that allows the generator output to not be affected by brief interuptions on the motor power supply. Nema MG-1 code states that the rated load inertia for a 15Hp motor is 75lbs-ft2. I do not have any test data (speed-torque curves) or anything else that tells me that the GE motor is special, but the MG set was designed as a package with the flywheel.
This motor has CR123C16.3B size-2 thermal overloads that trip when the motor is started. To prevent this, the starting sequence has been altered to jog the starter, allowing the motor to spin-up to speed. I am trying to find out if I can use higher overloads without damaging the motor. Mfg. motor data would certainly help me out.
Problem: How can I find speed-torque curves for old GE motors. Does anyone know of any good contacts for this? The normal GE motor tech-desk can not find "archived data".
From what I have learned, new standard GE 15Hp motors have hot and cold stall times of > 40 seconds. Is this number high for older 15Hp motors?
Also, newer 15Hp motors are normally on a 254 size frame. Does 324 sound too large?
Thanks in advance.
Attached to the motor end of the shaft is a 430lb. flywheel that provides 260lbs-ft2 of inertia. The flywheel is a design feature that allows the generator output to not be affected by brief interuptions on the motor power supply. Nema MG-1 code states that the rated load inertia for a 15Hp motor is 75lbs-ft2. I do not have any test data (speed-torque curves) or anything else that tells me that the GE motor is special, but the MG set was designed as a package with the flywheel.
This motor has CR123C16.3B size-2 thermal overloads that trip when the motor is started. To prevent this, the starting sequence has been altered to jog the starter, allowing the motor to spin-up to speed. I am trying to find out if I can use higher overloads without damaging the motor. Mfg. motor data would certainly help me out.
Problem: How can I find speed-torque curves for old GE motors. Does anyone know of any good contacts for this? The normal GE motor tech-desk can not find "archived data".
From what I have learned, new standard GE 15Hp motors have hot and cold stall times of > 40 seconds. Is this number high for older 15Hp motors?
Also, newer 15Hp motors are normally on a 254 size frame. Does 324 sound too large?
Thanks in advance.