Lenze 8400 - Manual (Page 199)

Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
199
5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
The motor model-based speed monitoring requires a rotating machine. Thus, the operational
performance of the sensorless control for synchronous motors is divided into two categories:
1. Open-loop controlled operation (|n
setpoint
| < n
C00996
)
• In the range of low speeds, the speed of a synchronous motor is not possible. Thus, only an
adjustable and constant current is injected that enables an acceleration.
2. Closed-loop controlled operation (|n
setpoint
| > n
C00996
)
• In this range, the rotor flux position and the speed are reconstructed via an observer. The
control is carried out field-oriented. Only the current is injected that is needed for the
required torque.
[5-13] Operating ranges of the sensorless control for synchronous motors
The sensorless control for synchronous motors has similar advantages for the closed-loop
controlled operating range and the servo control (SC) for synchronous motors. Compared to
asynchronous motors, there are the following advantages:
• Higher power density of the motor
• Higher efficiency
• Limitation of the maximum torque in motor mode and generator mode in closed-loop
operating range
• Implementation of simple positioning
5.8.1 Parameterisation dialog/signal flow

Proceed as follows to open the dialog for parameterising the motor control:
1. »Engineer« Go to the Project view and select the 8400 protec HighLine controller.
2. Select the Application parameters tab from the Workspace.
3. Select the motor control "3: SLPSM: Sensorless PSM" from the Overview dialog level in the
Motor control list field:
4. Click the Motor control servo SLPSM button to change to the Overview  Motor control
vector dialog box.
• This dialog level only shows a simplified signal flow with the most important
parameters.
• When you click the >>More details button in the left-most position, a signal flow with
more details/parameters is displayed.
 Operation in motor mode (CW rotation)
 Operation in generator mode (CCW rotation)
 Operation in motor mode (CCW rotation)
 Operation in generator mode (CW rotation)
 Field weakening (in preparation)
 Closed-loop controlled operation
 Open-loop controlled operation
Œ  Ž  Œ
0 1
2 3
M
n