What makes a motor have a maximum temperature?
Motor temperature ratings have to do with the maximum temperature RISE over ambient that the magnet wire insulation material is rated for, vs the cooling method’s ability to move heat away from the windings.
How is temperature rise of a reversible motor measured?
The temperature rise of our reversible motor is compared under conditions of multiple driving cycles. The measurement assumes the most severe condition in motor specification. Also, a heat sink is attached to the motor. (Size: 165 x 165 mm, thickness: 5 mm, material: aluminum).
When does temperature rise on an induction motor?
Therefore, induction motors are “continuously rated”. • Reversible motor: “30 minutes rated” In the case of a reversible motor, the allowable winding temperature is reached around 30 minutes. Therefore, reversible motors are “30 minutes rated”. However, the rated time is just a guide.
What happens when the temperature of an AC motor drops?
When the winding temperature inside the motor drops below a certain temperature, it will automatically recover and resume operation. With our AC motors, the ones marked “THERMALLY PROTECTED” or “TP” on the specification table or nameplate are equipped with an automatic reset type thermal protector.
What’s the maximum temperature a motor can rise to?
With Class F insulation, the maximum allowable temperature rise ranges from 105 to 115 C for the motor’s winding insulation, depending on how the motor is configured. For example, if the motor that was reported to be “running hot” has a 1.15 service factor, its maximum temperature rise would be 115 C plus the 40 C ambient.
What should the temp of the coolant sensor be?
Check that the temperature value of the CTS is around 80-90c when the engine is hot. A lot of engine coolant temperature sensors have two wires and the sensor is controlled by Ohm. Get a wiring diagram and find out what ohms you should have at a specific temperature to check the function.
Therefore, induction motors are “continuously rated”. • Reversible motor: “30 minutes rated” In the case of a reversible motor, the allowable winding temperature is reached around 30 minutes. Therefore, reversible motors are “30 minutes rated”. However, the rated time is just a guide.
What causes a needle gauge to read incorrectly?
You mentioned the electrical system which actually can cause needle gauges to read incorrectly. If you can thump the gauge with your finger and cause the needle to jump to and remain at a different reading then suspect a loose or dirty connection at the back of the gauge.