Notes from Dr. Borkosky

Thermal switches can be loaded as followed: Imax = 5.0 A (cut-in and cut-out current). Figure (6.28) illustrates the block diagram of an over temperature protective scheme for a three-phase direct-on-line start type squirrel cage induction motor. Thanks for your postings. Different types of thermal protection exist and are identified by a TP-code (TPxxx) which indicates: When it comes to pump motors, the most common TP designations are: Indication of the permissible temperature level when the motor is exposed to thermal overload.

Some people confuse this with the expected temperature rise of the motor, which it is not. Since thermostats are located on the outer surface of the coil ends, they sense the temperature at that location. This motor thermal overload protection scheme is very simple. Let’s look at the thermal over load relay and its function in motor thermal overload protection. Thermal switches can be retrofitted on the coil end, but the result is an increased reaction time.

I am a bit confused. In such cases, special care should be taken to control the ambient temperature inside the enclosure where the motor is located. I would like to know how can we set winding data for different types of motors for both 1 ph -3 ph. Hence both protections can be achieved. In the figure above, when START push is closed, the starter coil is energized through the transformer. As a result of this change, the internal relays de-energize the control coil of the external line break contactor. As the rotating magnetic flux cuts each of the bar conductor of rotor, there will be an induced circulating current flowing through the bar conductors. Does anyone know part number for it or suggest any generic brand that I can use. Temperature control is an important factor in successful motor operation. Differential protection is sometimes provided on very large and important motors in case of unearthed neutral systems. As the power id drawn by the motor from the supply depends upon the loading condition of the motor, for lower supply voltage, motor will draw higher current from mains to maintain required torque.

It is a TP motor and I was wondering if the TP was to protect the motor from the stove heat, but thanks to your info, I now know it’s to protect the motor from overheating and damaging the motor and possibly even causing a fire. The old motor is still going, mostly because it has places you can oil it every few months during cold weather. It must also be ensured that the relay must not operate under heavy starting currents up to say 6 times full load current which can last for a few seconds, half a minute or even longer in exceptional cases. becomes stationary by any external mechanical force. In that way all three phases are in contact with a thermal switch. The protection characteristic should lie just below the heating curve of the motor protected.

The discs are hermetically sealed and are placed on the terminal board.

Types of protections provided for unbalanced voltages will be discussed subsequently. Having a motor shut down because it tripped a thermal limit device is inconvenient, but it certainly is better than having to replace a motor because it overheats.

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