Arrangement and method for monitoring a psm-machine

Patent metadata

Field	Value
Publication number	US-2017179863-A1
Application number	US-201615381268-A
Country	US
Kind code	A1
Filing date	Dec 16, 2016
Priority date	Dec 21, 2015
Publication date	Jun 22, 2017
Grant date	—

Abstract

A method is provided for monitoring a PSM machine having at least, or exactly, three phases, which are operated by means of a field oriented control, comprising the following steps: detection of whether one or more current sensors disposed on a phase of the PSM machine has malfunctioned, when a malfunction of current sensors has been detected, such that only one of the current sensors remains functional, calculation of the voltage indicator from the voltage amplitudes and voltage phases of the input voltage of the PSM machine in a d, q-coordinate system by means of two different methods, wherein a first calculation of the input voltage occurs in the first method, based on a phase current measured by a functioning current sensor, and the target currents, as well as the electrical angle of the machine, and in the second method, a second calculation of the input voltage occurs, based on target values of the reference voltage amplitude and the reference voltage phase, and determination of the voltage amplitudes and voltage phases of the input voltage of the PSM machine through comparison of the values of the respective voltage amplitudes and voltage phases determined from the input voltage in the first and second methods with one another. Furthermore, a corresponding assembly is provided.

First claim

1 . A method for monitoring a PSM machine having at least or exactly three phases (U, V, W), which are operated by a field oriented control, the method comprising:
determining whether one or more current sensors disposed on a phase of the PSM machine has malfunctioned; wherein if a malfunction of the current sensors is detected, such that only one of the current sensors remains functional, the method also comprises calculating a voltage indicator from a voltage amplitude and a voltage phase of a input voltage of the PSM machine in a d, q-coordinate system using the following two different calculations: wherein the first calculation comprises calculating the input voltage based on a phase current measured by a functioning current sensor, target currents and an electrical angle of the PSM machine; and wherein the second calculation comprises calculating the input voltage based on target values of a reference voltage amplitude and a reference phase; determining the voltage amplitude and the voltage phase of the input voltage of the PSM machine; and comparing the values of the voltage amplitude and the voltage phase determined from the input voltage in the first calculation and the values of the voltage amplitude and the voltage phase determined from the input voltage in the second calculation.

2 . The method of claim 1 , wherein in the first calculation, the calculating of the voltage indicator from the voltage amplitude and the voltage phase of the input voltage is based on a phase of a current indicator Θ I and a current indicator amplitude {right arrow over (I)} s ;
wherein the first calculation also comprises calculating the phase of the current indicator Θ I via a load angle Θ Last Ref and an electrical angle Θ el of the PSM machine according to the following equation:
Θ I =Θ el +Θ Last Ref ;

wherein the first calculation also comprises calculating the load angle of the PSM machine Θ Last Ref from filtered currents I sdRefF and I sqRefF , that are offset target values of the d, q-currents, according to the following equation:

⊖

Last



Ref



=

arctan


IsqRefF
IsdRefF

;

[

[

(

Equation



2

)

]

]

wherein the first calculation further comprises calculating the current indicator amplitude {right arrow over (I)} s as a function of the current indicator in a U, V, W-coordinate system I su , I sv , I sw ;
wherein the calculating of the current indicator amplitude {right arrow over (I)} s in phase U comprises the following equation:



I
→

s



=

Isu

cos


(

Θ



I

)

;

[

[

(

Equation



4

)

]

]

wherein the calculating of the current indicator amplitude {right arrow over (I)} s in phase V comprises the following equation:



I
→

s



=

Isv

cos


(

Θ


I

+

4



π

3

)

;

[

[

(

Equation


Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Lamsahel Hassan

Classifications

• H02P6/16

  Circuit arrangements for detecting position · CPC title

• H02P27/08

  with pulse width modulation · CPC title

• G01R31/343

  in operation · CPC title

• H02P21/22 Primary

  Current control, e.g. using a current control loop · CPC title

• G01R31/2829

  Testing of circuits in sensor or actuator systems (testing of apparatus for measuring electric or magnetic variables G01R35/00; testing of indicating or recording apparatus G01D; in airbag systems B60R21/0173; checking gas analysers G01N33/007; monitoring or fail-safe circuits for electromagnets H01F7/1844) · CPC title