Bharat Bijlee Motor Dealer
Bharat Bijlee Motor in Ahmedabad
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The temperature detectors operate on the principle that the electrical resistance of a metallic conductor varies as the function of the temperature ( generally platinum, nickel, or copper conductors ). The temperature detectors are fitted with calibrated resistance which varies linearly with the temperature, allowing continuous follow up of motor heating on the controller display, with a high degree of accuracy and
Bharat Bijlee Dealer in Gujarat
Nipa Agencies have the quality of Bharat Bijlee Motor Dealer in Ahmedabad Gujarat India, Nipa Agencies is use to motor standards specify a maximum allowed ambient temperature, as well as a maximum, allowed temperature rise for each insulation class. Thus, the temperature of the hottest spot is indirectly limited Bharat Bijlee Motor in ahmedabad. The figures and the allowable temperature composition for the hottest spot are shown.
The same detector can be used for alarm ( when the motor is operated above the normal working temperature ) and for tripping operation ( usually set to the maximum temperature of the insulation class ). The resistance of the cables, contacts, so Bharat Bijlee Motor in Ahmedabad. can interfere with the measurement so there are different types of configurations that can be carried out
to minimize these effects
The thermistors have reduced size, do not have mechanical wear, and provide a faster response when compared to other temperature sensors. However, they do not allow continuous monitoring of the motor heating process. Thermistors with their electronic circuit controls ensure complete protection against overheating caused by Bharat Bijlee Motor in Ahmedabad, under/ overvoltages or frequent reversals of the direction of rotation or onoff cycles. They have low cost when compared to the Pt- However, they require a relay to control the alarm or operation activation.
For alarm and tripping operation Bharat Bijlee Dealer in Gujarat, the alarm thermostats should be suitable for the activation at the high expected motor temperature Bharat Bijlee Motor Dealer, while the tripping thermostats should activate at the maximum temperature allowed for the insulation material Bharat Bijlee Dealer in Gujarat.
These bi-metal thermal protectors Bharat Bijlee Motor Dealer with NC silver contacts open when pre-determined temperature rise is reached. When the activation temperature of the bimetal thermal protector decreases, the thermostat will return to its original form instantaneously allowing to close the contacts again. The thermostats can be used on three-phase electric motors for alarm or tripping purposes or Bharat Bijlee Dealer in Gujarat.
The thermal protector is basically formed by one bimetallic disc that has two moving contacts, one resistance and one pair of fixed contacts so Bharat Motor Dealer in India. The thermal protector is series-connected with the power supply and, due to the thermal dissipation caused by the current flowing through its internal resistance Bharat Motor Dealer in India, the disc is submitted to a deformation that opens the contacts, and motor power supply is interrupted.
The load is constant during an indefinite period of time, and it is equal to the rated motor output. It is the purchaser’s responsibility to state the duty as accurately as Bharat Motor Dealer in India. In cases where there are no-load variations or when variations can be predicted, the duty can be indicated by numbers or by means of charts representing the load variations over time.
Whenever the actual load variation in real-time cannot be determined a fictitious sequence Bharat Motor Dealer in India, no less severe than the actual duty should be indicated by the customer. When another starting duty is used than the informed one the motor nameplate this may result in motor overheating and consequent motor damage. In case of doubt,
A sequence of identical duty cycles, each including a time of operation at constant load and a time de-energized Bijlee Motor Dealer Agencies. These periods are so short that the thermal equilibrium is not reached during one duty cycle and the starting current does not significantly affect the temperature rise.
A sequence of identical duty cycles, also operation at constant load, time of electric braking, Bharat Bijlee Motor Dealer, and a time de-energized and at rest also Bijlee Motor Dealer Agencies. These periods are so short that the thermal equilibrium is not reached.
A sequence of identical duty cycles, each cycle consisting of a time of operation at a constant load corresponding to a predetermined speed of rotation Bijlee Motor Dealer Agencies, followed by one or more times of operation at other constant loads corresponding so different speeds of rotation. There is no time de-energized and at rest.
A duty consisting of a specific number of discrete values of loads Bijlee Motor Dealer Agencies and if applicable, speed, each load/speed being maintained for sufficient time to allow the machine to reach thermal equilibrium, The minimum load within a duty cycle may have the zero value Bharat Bijlee Motor Dealer..
mechanical power available at shaft end is directly related to the temperature rise of the winding. As you know, the motors can drive much higher power loads than its rated output, until it almost reaches the breakdown torque. However, if the overload exceeds motor output for which it has been designed, overheating will be generated and the motor life will be reduced significantly, or may even result in motor burn out.
It is assumed that the electric motor must supply to the driven machine the required power. It is also recommended that the motor provides some extra power for eventual overloads; depending on the duty cycle, the motor can occasionally supply more or Bharat Bijlee Motor Dealer. Although there are many standardized ways to describe the running conditions of a motor, it is often necessary to evaluate the load conditions imposed on the motor by more complex duty cycles than those described in the standards Bharat Bijlee Motor Dealer. The formula below gives a usual method to calculate the equivalent power rating: