What is the Rated Current of the motor?
The rated current of motor refers to the current that the motor can work continuously under the rated voltage condition, usually expressed in ampere (A). Rated current is a reasonable current value determined by the motor designer after considering the safety and service life of the motor. It is the maximum safe use current of the motor, and the motor can work normally when running at rated current.
The relationship between the Actual Motor Current and Rated Current.
The current consumed when the motor works normally is called actual current. The relationship between the actual current and rated current of the motor is that when the motor load is small, the actual current is less than the rated current; When the motor load increases, the actual current gradually increases until it is equal to the rated current; When the load continues to increase, the actual current continues to increase, and when it exceeds the rated current, the motor will be overloaded until the fuse is broken or the motor burns out.
How to set a safe motor Running Current Range?
The actual current of the motor is usually safe within the range of rated current plus 10%. Usually, the rated current of the motor is not the maximum allowable value of the actual current of the motor, but the actual current of the motor cannot exceed the rated current for a long time. If the actual current of the motor exceeds 20% of the rated current, the motor will be overheated and even damaged.
How to ensure that the Actual Current of the motor does not exceed the Rated Current?
1. Select the appropriate motor model and determine the rated current of the motor;
2. Connect the motor and power supply correctly to ensure that the voltage and frequency of the power supply are the same as the rated voltage and frequency of the motor;
3. Limit the output load current to ensure that it works within the rated load range;
4. Avoid sudden increase of output load current due to process control command error or other reasons.
Other Attentions
1. The actual current of the motor cannot exceed the rated current for a long time;
2. The actual current of the motor in actual use may be greater than the rated current;
3. When the actual current of the motor exceeds the rated current, measures must be taken immediately to reduce the load or stop the motor running;
4. It is normal for the motor to generate heat during use, but it should not exceed the allowable temperature rise range;
5. When controlling the operation of the motor, it is necessary to strictly control the parameters such as the load and speed of the motor to ensure the normal operation of the motor and prevent the occurrence of overload.
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