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Relationship between servo driver and inverter

Release date:2015-05-14Views:1923

Inverter and the servo driver are all commonly used electrical equipment, but the same is control motor frequency is why two different electrical equipment! The following will be from the three aspects of inverter, servo motor control and motor are introduced and compared.

The inverter:

Simple inverter only conditioning communication motor speed, then can open loop to loop to control method and frequency converter and decide, this is traditional V / F control method. Now many frequency now, after the establishment of mathematical model, the communication of motor stator magnetic field UVW3 phase transformation to control motor speed and torque of the two current components, now most to the famous brand of torque control inverter are used such methods to manipulate the control torque, the UVW each phase output to current detection equipment Jiamoer effect, the sampling reaction to form a closed loop negative reaction to the current loop PID conditioning; AFSEN of frequency conversion proposed and this method is not the same as the direct torque control skills. This can not only control the speed of the motor can also control the motor torque and speed and control precision is superior to that of the V / F control, encoder reaction can also be added with, add time control accuracy and echo characteristics better many.

Motor:

Servo motor of the materials, the structure and the processing technology is far higher than drive inverter AC motor (usually AC motor or constant torque, constant power and other types of variable frequency motor), that is to say when the driver output current, voltage, frequency change quickly of power, servo motor can power basis change echoed the action for change, response and anti overload ability is far higher than that of AC motor drive inverter, motor the distinction is that functions as both are not the same. That is to say not variable frequency output cannot change so fast power signal, but the motor itself is no response, so in the conversion of the internal algorithm set in order to maintain the motor do corresponding overload set. Of course, if not set inverter output capacity is still limited, some excellent performance of inverter can direct drive servo motor.

The servo actuators:

Servo drive in carrying out the conversion skills under the premise, interior of the drive current loop, speed loop and position loop (converter without the ring) are than usually inverter more accurate manipulation skills and algorithms, function also than traditional servo strong many, the main point to accurate position control. After the pulse sequence sent by the host controller to control the speed and range (of course, some servo internal integrated control unit or through communication bus directly to the range, speed and other parameters of the set is in the drive), drive the internal algorithm and faster and more accurate design calculation performance and more excellent electronic devices to more superior to the inverter. PLC training class

One important difference between servo and frequency is:

No frequency encoder, there must be a servo encoder, electronic commutation, AC servo technology itself is reference and the application of frequency conversion technology, the frequency control mode of PWM mode based on DC motor servo control on imitate DC motor to achieve, that is to say this part of AC servo motor is inevitable frequency: PLC data conversion is 50, frequency 60HZ AC DC rectifier first, and then through the door of the control transistors (IGBT, IGCT) for pulse electric adjustable frequency waveform similar to Yu Zheng by cosine carrier frequency and PWM control inverter, the frequency is adjustable, so the AC motor speed can be adjusted (n=60f/2p, n speed, f frequency, P log).