Cixi Finatech motor system fault solution

Cixi Finatech motor system fault solution

Cixi Fei Nade Electric Appliances Factory Business Scope:
Motor Protector, Phase Sequence Protector, Overvoltage Protector, Under Voltage Protector, Over Current Protector, Phase Loss Protector, Three Phase Unbalance Protector, Overload Protector, Underload Protector, Power Protection Relay, Disconnect Phase protectors, phase sequence relays, undervoltage relays, etc.
First, the factors that lead to motor failure
(1) Motor short circuit
(2) The motor is broken
(3) Motor single-phase grounding
(4) Motor bearing temperature is too high, squirrel cage motor rotor broken bar
(5) Motor stator winding low voltage
(6) Synchronous motor desynchronization, loss of magnetization or non-synchronous surge current
(7) The voltage supplied to the motor is too high or too low, or the frequency is abnormal
(8) Stalled Motor Mechanical Overloading
Second, the motor protector China's motor protector has roughly experienced a full imitation of the Soviet Union, its own design, replacement, and intelligent development of several stages. In recent years, due to the development of micro-processing technology, the motor protector has been provided with a hardware platform for intelligent and multi-functional development, making the motor protector enter a stage of rapid development.
Temperature protector
(1) Bimetallic disc temperature protector. A bimetal disc type temperature relay, usually mounted on the motor end cap, is generally large in volume and contact current capacity, and is made of phenolic plastic. The bimetallic disc temperature protector is not only sensitive to temperature, but also sensitive to current, so it has a more comprehensive protection function.
(2) Built-in temperature protector. This kind of temperature protector is usually installed in the motor winding, the winding surface or the winding end surface, and is impregnated together with the motor winding. The embedded temperature protector has the advantages of small size, high sensitivity and good reliability, and is often used for direct protection of various small-capacity motors.
2. Overload protectors are commonly used bimetal thermal relays and air circuit breakers. The thermal relay is purely overload thermal protection device, which only provides overload thermal protection, and does not have protection function for short circuit, undervoltage, etc. It is used for ordinary small-capacity AC motors, and the working conditions are good. There are no occasions such as frequent starting and other harsh working conditions. Due to poor accuracy, reliability cannot be guaranteed. The air circuit breaker has many protection functions and can simultaneously perform various functions such as thermal overload protection, short circuit protection, and under voltage protection.
The operating time of the overload protection device should be slightly longer than the motor starting time. The characteristics of the motor overload protection device can only ensure its normal operation by avoiding the characteristics of the starting current of the motor. However, the operating time of the motor overload protection device cannot be too long. The characteristics of the motor overload protection device can only perform overload protection under the thermal characteristics of the motor.
Cixi Fei Nade Electrical Appliance Factory (referred to as "Finnard Electric") is a company specializing in the production and sales of motor protectors, power protection relays, phase sequence relay company. The main products are: three-phase power protection, motor protection, phase protection, phase failure protection, phase and phase sequence protection, three-phase overload protection, intelligent motor protection, microcomputer motor protection, motor Comprehensive protector, power protection relay, surge protector, thermostat, explosion-proof switch, explosion-proof control box, escalator synchronization rate tester, stand-alone automotive air conditioning controller, automotive fan stepless speed regulator, boiler liquid level meter And so on, for the domestic major elevator plants, thermal power plants, auto factories supporting our products are mainly for domestic customers: Shanghai Volkswagen, Foxconn Group, Mitsubishi Group, Suzuki Group, Tianjin lifting, General Electric, etc., exported to Europe And Taiwan, Japan, Southeast Asia and so on.
Article Source: Cixi Fei Nade Electrical Appliance Factory