Expert settings
The parameters for this motor control type are calculated and set automatically while optimising the control loops.
Details
The motor model-based speed observer requires a rotating machine. Thus, the operational performance of the sensorless control for synchronous motors is divided into two ranges:
1.
Low speed range (|setpoint speed| < lower limit 0x2C11:001)
–
In the range of low speeds, the speed of a synchronous motor cannot be observed. In this "Low speed range", controlled operation takes place: During the acceleration phase
, the current setpoints of 0x2C12:001 and 0x2C12:002 are added
and injected into the motor.
2.
High speed range (|setpoint speed| > lower limit 0x2C11:001)
–
In this area, the rotor flux position and the speed are reconstructed by means of an observer. The control is executed in a field-oriented way. Only the current required for generating the necessary torque is injected.
Parameter
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Address
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Name / setting range / [default setting]
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Information
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0x2C11:001
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High speed range: Lower limit
5 ... [10] ... 100 %
–
From version 02.00
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Definition of the lower limit of the high speed range.
–
The lower limit has a permanent hysteresis of 5 %.
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0x2C11:002
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High speed range: Tracking controller gain
0 ... [200] ... 65535 %
–
From version 02.00
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Gain factor for tracking the rotor position in the motor model.
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0x2C11:003
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High speed range: Tracking controller reset time
0.00 ... [6.00] ... 655.35 ms
–
From version 02.00
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Reset time for tracking the rotor position in the motor model.
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0x2C11:004
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High speed range: Tracking controller decouple time
0.0 ... [200.0] ... 6553.5 ms
–
From version 02.00
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Temporal hysteresis for the switching back and forth from the open-loop controlled to the closed-loop controlled operation.
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0x2C12:001
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SM low speed range: Acceleration current
5 ... [70] ... 400 %
–
From version 02.00
|
R.m.s. current value for acceleration processes in the lower velocity range.
–
100 % = Rated motor current (0x6075 (P323.00))
–
In the lower speed range and during the acceleration phase, the current setpoints of 0x2C12:001 and 0x2C12:002 are added and injected to the motor.
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0x2C12:002
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SM low speed range: Standstill current
5 ... [30] ... 400 %
–
From version 02.00
|
R.m.s. current value for processes without acceleration (for instance standstill or constant
setpoint speed) in the lower velocity range.
–
100 % = Rated motor current (0x6075 (P323.00))
–
In the lower speed range and during the acceleration phase, the current setpoints of 0x2C12:001 and 0x2C12:002 are added and injected to the motor.
Note!
At the "100 %" setting, a motor current flows at standstill and at constant speed. The r.m.s. value of this motor current
is greater than the rated motor current by a factor of sqrt(2) at standstill. The reason for this is that a DC current is injected into the synchronous motor at a standstill. The correct rated motor current flows when the motor turns. |
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