STEP's new generation EP/ET/EH intelligent flexible drive has been launched for nearly a year, and its product application features have played an important role in the field of many users.
As we all know, double carbon energy saving is one of the main directions of current industrial development. The majority of customers are no longer satisfied with the traditional squirrel cage three-phase asynchronous motor application, permanent magnet synchronous motor and synchronous reluctance motor with higher energy efficiency and higher control accuracy have become the first choice in many industries.
When the original inverter directly controls the permanent magnet or reluctance motor, there are many problems. Such as:
1. The permanent magnet starts up and the back potential causes the motor to reverse;
2. Motor self-tuning cannot be completed. The motor moves at low speed and cannot reach the given frequency (cannot reach the speed);
3 Motor vibration, howling, fever, unable to operate normally, etc.
Therefore, the traditional frequency converter algorithm can not control the operation of the synchronous motor well, and the use of V/F control mode to drive the synchronous motor, can not play the efficiency of the motor. STEP is an established manufacturer of complete sets of elevator electronic control, with more than 20 years of experience in the application of synchronous motors in the elevator industry.
The parameters of intelligent flexible actuator in synchronous motor control fully reflect its product advantages. Synchronous motor startup reversal, because the permanent magnet under the influence of salient pole effect, because the pole position is uncertain, input error current phase. Therefore, when starting the machine, the initial position of the magnetic pole should be presumed first to detect the position of the magnetic pole.
Internal parameters of intelligent flexible actuator:
This function is used to set the control operation mode of frequency converter:
0: indicates GVC control
Suitable for most applications, suitable for synchronous motors, asynchronous motors and synchronous reluctance motors.
1: SVC control
Sensorless vector control, suitable for synchronous and asynchronous motors.
Motor type can be selected:
0: indicates an asynchronous motor
1: synchronous motor
2: reluctance motor
And the driver can support the second motor drive, which is used in logistics shuttle, stacker and other occasions
0: do not judge
No load startup capability, requiring longer acceleration time.
1: DC injection starts
Add DC current incrementally to (P15.05* rated current of the motor) and drag the magnetic pole of the motor to the excitation direction.
2: Pulse voltage injection starts
Inject voltage pulse for initial pole determination.
Through the above parameter Settings, with the motor self-tuning, the synchronous motor can be well driven to start, play the characteristics of permanent magnet synchronous motor and synchronous reluctance. So, when someone claims that his frequency converter can also drive a synchronous motor, check his user's manual for the parameters listed above. If not, driving the synchronous motor will not be able to avoid some of the abnormal phenomena described earlier in this paper, and will not be able to drive the synchronous motor to its better energy efficiency level.