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Reason the frequency converter causes the Ex motor to burn
source：未知 time：2024-09-05 13:54nbsp; click：
The explosion-proof frequency converter motor is a type of explosion-proof motor product and is the basic power equipment for industrial agriculture. With the rapid development of electronic technology, the AC speed regulation method of "explosion-proof frequency converter motor + frequency converter" is undergoing a revolution in the field of speed regulation with its high performance and economy. The benefits it brings to the industries in need are energy saving, improving product qualification rate and product quality, and greatly improving mechanical automation and production efficiency.
1: Advantages of explosion-proof frequency converter motor
1. It has a starting function.
2. The electromagnetic design is adopted to reduce the resistance of the stator and rotor.
3. It is suitable for frequent speed changes under different working conditions.
4. It saves energy to a certain extent.
The explosion-proof frequency converter motor adopts B and temperature rise design, F-class insulation manufacturing, polymer insulation materials and vacuum pressure immersion paint manufacturing process, and special insulation structure, so that the insulation withstand voltage and mechanical strength of the electrical winding are greatly improved, which is enough to cope with the high-speed operation of the motor and resist the high-frequency current impact of the frequency converter and the damage of the insulation to the voltage. The balance quality is high, and the vibration level is R level (vibration reduction level). The mechanical parts have high processing precision and use special high-precision bearings, which can run at high speed. The forced ventilation and cooling system uses imported axial flow fans for ultra-quiet, long life and strong wind. It ensures that the explosion-proof motor can be effectively cooled at any speed, and can achieve long-term operation at high or low speed. The heat dissipation of ordinary asynchronous motors relies on the fan behind the motor to blow air to dissipate heat. If it runs at low frequency for a long time (that is, it runs below the rated frequency of the motor for a long time). The low speed of the motor will cause the fan to blow less air, resulting in poor heat dissipation of the motor. If it is too hot, it will burn the motor. If there is a problem with the motor, the motor current will increase. If it exceeds the maximum current of the inverter, the inverter will implement protection to stop the output and report a fault code to tell the user.
2: What are the reasons for the inverter to cause the motor to burn?
1. Use ordinary motors as variable frequency motors. Since the cooling fan of ordinary motors is connected to the shaft, when the inverter is used for speed regulation, the speed is unstable and cannot reach the rated speed of the motor, and the cooling fan cannot play a normal role, causing poor heat dissipation of the motor: In addition, ordinary motors are not designed according to the frequency conversion requirements, which causes the motor to heat up or burn.
2. The variable frequency motor and the inverter are directly connected together without debugging. The two most commonly used methods for inverter control of motors are vector control and V/F curve control. Each control method must first set the motor type (synchronous, asynchronous, with or without encoder), motor rated power, rated voltage, rated current, speed or number of poles, rated frequency, maximum operating frequency, acceleration and deceleration time of motor start and stop, protection method of the inverter to control the motor, protection ratio coefficient, carrier frequency, etc., all of which are indispensable. After these parameters are set, choose vector control or V/F control. When selecting vector control, the motor should be paired with the inverter for dynamic self-learning without load or static self-learning with load. Only after self-learning can the motor and inverter cooperate to exert the accuracy of vector control; when V/F control is selected, no self-learning is required, and the parameters can be directly powered on and run after adjustment.
3. The running direction of the variable frequency motor fan is inconsistent with the rotation direction marked on the fan, and the fan cannot play a role, causing the motor heat dissipation condition to deteriorate, and the heat generated by the motor cannot be dissipated, causing the motor to heat up or burn.
4. Items 2 and 3 of the above three situations occur most often. When the motor current in the inverter is set too large, the motor protection parameter is set too large, and the inverter cannot protect the motor according to the actual current of the motor when the motor is overloaded, causing the motor to overload and heat up or burn out. When the motor speed is set incorrectly, if the set speed exceeds the rated speed of the motor, the motor will run in the constant power area at a higher speed at the rated frequency point. The higher the speed, the smaller the output torque, causing the motor current to be too large and heat up or burn out. If the motor acceleration and deceleration time is too short, the inverter will report an overcurrent fault and protect itself. The inverter uses vector control, but the motor and the inverter are not paired for self-learning, causing the inverter to control the motor parameters inconsistent with the actual values of the motor, causing the control accuracy to deteriorate and the motor to burn out. Overheating or burning; when the carrier frequency is set to a relatively high level, the switching rate of the inverter switch tube is relatively high, and the heat generation increases. At this time, the inverter's ability to resist changes in load current decreases. When the load current increases, the inverter is likely to trip due to overcurrent, and the surface phenomenon is that there is a problem with the motor; the motor protection current is not set, and the default protection current of most inverters is 150% of the rated output current of the inverter. The inverter will only protect when the motor current reaches this value; and the output current of the inverter must be greater than the rated current of the motor. When the motor current reaches the protection current of the inverter, the motor is actually overloaded by far more than 150%, and the motor overheats and burns. What the customer sees is that the inverter is fine, but the motor quality is unreliable.
motor ATEX certificate,Low Voltage Explosion Proof Motor, Motor manufacturers in China, three phase induction motor, Wolong Nanyang Explosion Protection
1. It has a starting function.
2. The electromagnetic design is adopted to reduce the resistance of the stator and rotor.
3. It is suitable for frequent speed changes under different working conditions.
4. It saves energy to a certain extent.
The explosion-proof frequency converter motor adopts B and temperature rise design, F-class insulation manufacturing, polymer insulation materials and vacuum pressure immersion paint manufacturing process, and special insulation structure, so that the insulation withstand voltage and mechanical strength of the electrical winding are greatly improved, which is enough to cope with the high-speed operation of the motor and resist the high-frequency current impact of the frequency converter and the damage of the insulation to the voltage. The balance quality is high, and the vibration level is R level (vibration reduction level). The mechanical parts have high processing precision and use special high-precision bearings, which can run at high speed. The forced ventilation and cooling system uses imported axial flow fans for ultra-quiet, long life and strong wind. It ensures that the explosion-proof motor can be effectively cooled at any speed, and can achieve long-term operation at high or low speed. The heat dissipation of ordinary asynchronous motors relies on the fan behind the motor to blow air to dissipate heat. If it runs at low frequency for a long time (that is, it runs below the rated frequency of the motor for a long time). The low speed of the motor will cause the fan to blow less air, resulting in poor heat dissipation of the motor. If it is too hot, it will burn the motor. If there is a problem with the motor, the motor current will increase. If it exceeds the maximum current of the inverter, the inverter will implement protection to stop the output and report a fault code to tell the user.
2: What are the reasons for the inverter to cause the motor to burn?
1. Use ordinary motors as variable frequency motors. Since the cooling fan of ordinary motors is connected to the shaft, when the inverter is used for speed regulation, the speed is unstable and cannot reach the rated speed of the motor, and the cooling fan cannot play a normal role, causing poor heat dissipation of the motor: In addition, ordinary motors are not designed according to the frequency conversion requirements, which causes the motor to heat up or burn.
2. The variable frequency motor and the inverter are directly connected together without debugging. The two most commonly used methods for inverter control of motors are vector control and V/F curve control. Each control method must first set the motor type (synchronous, asynchronous, with or without encoder), motor rated power, rated voltage, rated current, speed or number of poles, rated frequency, maximum operating frequency, acceleration and deceleration time of motor start and stop, protection method of the inverter to control the motor, protection ratio coefficient, carrier frequency, etc., all of which are indispensable. After these parameters are set, choose vector control or V/F control. When selecting vector control, the motor should be paired with the inverter for dynamic self-learning without load or static self-learning with load. Only after self-learning can the motor and inverter cooperate to exert the accuracy of vector control; when V/F control is selected, no self-learning is required, and the parameters can be directly powered on and run after adjustment.
3. The running direction of the variable frequency motor fan is inconsistent with the rotation direction marked on the fan, and the fan cannot play a role, causing the motor heat dissipation condition to deteriorate, and the heat generated by the motor cannot be dissipated, causing the motor to heat up or burn.
4. Items 2 and 3 of the above three situations occur most often. When the motor current in the inverter is set too large, the motor protection parameter is set too large, and the inverter cannot protect the motor according to the actual current of the motor when the motor is overloaded, causing the motor to overload and heat up or burn out. When the motor speed is set incorrectly, if the set speed exceeds the rated speed of the motor, the motor will run in the constant power area at a higher speed at the rated frequency point. The higher the speed, the smaller the output torque, causing the motor current to be too large and heat up or burn out. If the motor acceleration and deceleration time is too short, the inverter will report an overcurrent fault and protect itself. The inverter uses vector control, but the motor and the inverter are not paired for self-learning, causing the inverter to control the motor parameters inconsistent with the actual values of the motor, causing the control accuracy to deteriorate and the motor to burn out. Overheating or burning; when the carrier frequency is set to a relatively high level, the switching rate of the inverter switch tube is relatively high, and the heat generation increases. At this time, the inverter's ability to resist changes in load current decreases. When the load current increases, the inverter is likely to trip due to overcurrent, and the surface phenomenon is that there is a problem with the motor; the motor protection current is not set, and the default protection current of most inverters is 150% of the rated output current of the inverter. The inverter will only protect when the motor current reaches this value; and the output current of the inverter must be greater than the rated current of the motor. When the motor current reaches the protection current of the inverter, the motor is actually overloaded by far more than 150%, and the motor overheats and burns. What the customer sees is that the inverter is fine, but the motor quality is unreliable.
motor ATEX certificate,Low Voltage Explosion Proof Motor, Motor manufacturers in China, three phase induction motor, Wolong Nanyang Explosion Protection
上一篇：Necessity of safety upgrade of standard increased safety mot | 下一篇：Is the number of poles of the motor rotor fixed?
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