电机转矩与变频器的关系（Relationship between motor torque and frequency converter）.docVIP

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电机转矩与变频器的关系（Relationship between motor torque and frequency converter）.doc

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电机转矩与变频器的关系（Relationship between motor torque and frequency converter）

电机转矩与变频器的关系（Relationship between motor torque and frequency converter） The relationship between motor torque and frequency converter and mechanical characteristics of variable frequency speed adjustment are analyzed. The rotation speed of the motor is r/min, which is the number of revolutions per minute, which can also be expressed as RPM. For example: 2 pole motor 50Hz 3000 [r/min], 4 pole motor 50Hz 1500 [r/min] The rotation speed of the motor is proportional to the frequency The motor in this paper is inductive ac motor, and most of the motors used in industry are of this type. The rotation speed of inductive ac motor (hereinafter referred to as the motor) is approximately determined by the number and frequency of the motor. The working principle of the motor determines that the pole number of the motor is constant. Since the extreme value is not a continuous number (a multiple of 2, such as a number of 2, 4, and 6), it is generally uncomfortable to adjust the motor speed by changing the value. In addition, the frequency can be adjusted on the outside of the motor to supply the motor, so that the rotation speed of the motor can be controlled freely. Therefore, the frequency converter is the optimal equipment for motor speed control equipment. N = 60 f/p N: synchronous speed F: power frequency P: the motor is logarithmic Changing frequency and voltage is the optimal control method of motor If the frequency is changed without changing the voltage and the frequency is reduced, the motor may be overvoltage (overexcitation), causing the motor to be burnt. So the frequency converter must change the voltage while changing the frequency. When the output frequency is above the rated frequency, the voltage can not continue to increase, the highest can only be the rated voltage of the motor. For example, in order to reduce the rotation speed of the motor by half, the output frequency of the frequency converter is changed from 50Hz to 25Hz, then the output voltage of the con