In different cases, the inverter needs to bring different types of encoders, as follows:
In the process of motor start, acceleration and deceleration stop, the drive current of the motor needs to match the back electromotive force generated under the actual speed, if the motor drive current and the back electromotive force impedance does not match, the motor driving force is not enough to cause the motor current to increase, easy to burn the motor coil or driver. The timely feedback from the encoder can calculate the actual speed and calculate the back electromotive force to match the drive current, thus protecting the motor and the driver. Such requirements require incremental encoders.
The variable frequency motor can also provide position closed-loop control to the frequency converter (PG card) with position control function through the position feedback of the encoder, or the encoder signal can be given to the PLC, and the PLC can command the frequency converter to decelerate and brake for position closed-loop control, which requires the absolute value encoder.
There are digital inverter parts inside the inverter, and the high-frequency harmonic interference source is complex, so it is particularly important to choose the anti-interference characteristics of the encoder. It is recommended to choose the incremental signal output type of HL-6, or choose the absolute value encoder.
Integrating the above requirements of variable frequency motors, variable frequency motors sometimes need two sets of encoder signals at the same time, need to have a dual signal output encoder, one of which is the absolute encoder signal into the PLC controller, and the other group needs an incremental pulse signal into the variable frequency controller.
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