Bosch PIN8 N1 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 223)

100

101

MPH-02, MPB-02, MPD-02 Drive Control 6-11

DOK-INDRV*-MP*-02VRS**-FK01-EN-P

The field-oriented closed-loop current control has the following general

features:

• closed-loop control of the motor current according to the principle of

field orientation, i.e. separate closed-loop control of the torque-

generating current and the flux-generating current

• compensation of the cross coupling of the d and q axes to increase

dynamics

•

voltage loop for operation in the field weakening range

• activation of the optimum current loop proportional amplification value

depending on the current PWM frequency during the load defaults

procedure

In the case of synchronous motors, the field-oriented closed-loop current

control additionally has the following features:

• limitation of the I

command value at the voltage limit for protection

against too little control margin

• utilization of the reluctance effect to increase the available torque in

the basic speed range

• support of synchronous motors with reluctance torque, i.e. motors with

significantly different inductances in the d and q axes

In the case of asynchronous motors, the field-oriented closed-loop current

control additionally has the following features:

• optimum torque linearity, even in the field weakening range, by:

• permanent correction of the torque constant and the slip factor by

means of the currently calculated rotor flux

• rotor flux model taking temperature and saturation behavior of the

magnetizing inductance into account

• improved dynamic behavior by:

• voltage- and load-dependent flux feedforward

• voltage loop for correcting the flux feedforward

• flux loop for dynamically generating the rotor flux

• possibility of reducing the magnetizing current for low-loss operation at

no load or in partial load range

Current loop setting:

• S-0-0106, Current loop proportional gain 1

• S-0-0107, Current loop integral action time 1

• P-0-0001, Switching frequency of the power output stage

• P-0-0045, Control word of current controller

Voltage loop setting:

• P-0-0533, Voltage loop proportional gain

• P-0-0534, Voltage loop integral action time

• P-0-0535, Motor voltage at no load

• P-0-0536, Maximum motor voltage

Rotor flux control for asynchronous motors:

• P-0-0528, Flux control loop proportional gain

• P-0-0529, Scaling of stall current limit

• P-0-0530, Slip increase

• P-0-0532, Premagnetization factor

General Features

Features of Synchronous Motor

Control

Features of Asynchronous Motor

Control

Pertinent Parameters

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