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We’ll explore some common thermal winding protection devices and temperature sensors here.Ī bimetallic strip is the operating component of a thermal motor overload relay. The winding protection employs a sensor that registers the thermal condition of the motor’s stator windings and when a thermal overload occurs, the thermal winding protection causes a shutdown of the motor.ĭepending on the thermal protection device used, the methodology for thermal measurement and how the protection device interacts with a KEB variable frequency drive (VFD) can be different. Thermal winding protection can come in a number of different options, but the fundamental principle is the same. Temp sensors get embedded into the motor winding What is thermal winding protection? After investigating, the manufacturing company determined that the servo motor did have a PTC thermistor thermal winding protection, but it was not connected to a thermal monitoring source. The motor needs to be sent out to a shop to be rewound or completely replaced. Ultimately, the motor windings fail and the production line goes down. This higher RMS current creates an accumulating amount of energy in the form of heat inside the motor windings. Over some time, the higher cycling results in a higher RMS motor current. The machine begins running well but then the company decides they need faster output so the motor’s duty cycle is increased. Let’s visit a hypothetical example – a manufacturing company utilizes a servo motor on a new assembly machine. EASA has a nice page with some good pictures of typical motor failures – you don’t want this to be you. This creates a level of protection against excessive winding temperature that could eventually lead to permanent winding insulation breakdown and failure.
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The motor can be started again only when temperature and hence resistance of the thermistors drop to low values.For this, the relay is adjusted such that its pick up current is more than twice its drop out current.Thermal winding protection for motors is a key component in operational automated equipment. Whenever there is excessive motor temperature due to some reason, the thermistor resistance increases and causes reduction in the current flowing through CR relay coil.Thus the CR relay drops, which in turn drops contactor M and therefore the motor stops. With the closing of CR, contact CR1 closes and hence coil M gets energised. When the START-push button is pressed the primary winding of control transformer T1 gets energised and therefore the secondary winding sends direct current to CR relay through diodes D1 and D2. It have the comparatively resistance in low value at normal temperature and constant upto some value and has a large positive temperature co-efficient of resistance that can be controlled the range of temperature.Īnother good feature is that its power carrying capacity is self-limiting since the device has the tendency to increase its resistance as the temperature rises.īasic Operation For Over Temperature Protectionĭuring starting sufficient current will flow through the CR relay to actuate it as the temperature and resistance of the thermistors are low. The important component for over temperature protection from type of semiconductor device is called ” Thermistor” is used because this material have the unique property. How Over Temperature /Overheat protection works?
#Motor winding temperature sensor install
To avoid issued for overheat or over temperature,we can install the overheat protection device that can prevent the motor from damage or winding burn.This device is common used for high priority motor in operation to avoid major breakdown. What is the main reason for the motor overheat or over temperature?Normally it cause due to a high ambient temperature,under sizing motor capacity,not suitable voltage rated,running in overload and bearing jammed. Motor temperature is one of the factor that we should monitor and make sure it running in a normal range.It is closely related with winding temperature.If temperature is highly from standard value,it can cause a winding insulator damage or weak.įrom that damage,it will make the internal short circuit between winding phase and can cause a serious damage for an electric motor.