Piecewise characterization of electromechanical actuator

Patent metadata

Field	Value
Publication number	US-2024238842-A1
Application number	US-202318098396-A
Country	US
Kind code	A1
Filing date	Jan 18, 2023
Priority date	Jan 18, 2023
Publication date	Jul 18, 2024
Grant date	—

Abstract

A method includes applying a high frequency signal to an electromechanical actuator and measuring a first response of the electromechanical actuator to the high frequency signal, estimating electrical parameters of the electromechanical actuator based on the first response, applying a low frequency broadband signal to the electromechanical actuator and measuring a second response of the electromechanical actuator to the low frequency broadband signal, and estimating mechanical parameters of the electromechanical actuator based on the second response and the estimated electrical parameters.

First claim

1 . A method, comprising:
applying a high frequency signal to an electromechanical actuator and measuring a first response of the electromechanical actuator to the high frequency signal; estimating electrical parameters of the electromechanical actuator based on the first response; applying a low frequency broadband signal to the electromechanical actuator and measuring a second response of the electromechanical actuator to the low frequency broadband signal; and estimating mechanical parameters of the electromechanical actuator based on the second response and the estimated electrical parameters.

2 . The method of claim 1 ,
wherein said applying the high frequency signal and said applying the low frequency broadband signal are performed concurrently.

3 . The method of claim 2 ,
wherein the high frequency signal and the low frequency broadband signal are selected such that they do not produce harmonics that interfere with each other.

4 . The method of claim 1 ,
wherein said applying the high frequency signal is performed prior to said applying the low frequency broadband signal.

5 . The method of claim 1 ,
wherein said applying the high frequency signal is performed after said applying the low frequency broadband signal.

6 . The method of claim 1 , further comprising:
said estimating the electrical parameters and the mechanical parameters of the electromechanical actuator during calibration of the electromechanical actuator during manufacture of a device that includes the electromechanical actuator.

7 . The method of claim 1 , further comprising:
said estimating the electrical parameters and the mechanical parameters of the electromechanical actuator during operation by a consumer of a device that includes the electromechanical actuator.

8 . The method of claim 1 ,
wherein the electrical parameters and the mechanical parameters are obtained in less than 50 milliseconds.

9 . The method of claim 1 ,
wherein said applying the high frequency signal and measuring the first response and/or said applying the low frequency broadband signal and measuring the second response are repeated multiple times to improve signal-to-noise ratio.

10 . The method of claim 1 ,
wherein the low frequency broadband signal spectrally covers a frequency band centered around a range of a mechanical resonant frequency experimentally predetermined from a sample of instances of the electromechanical actuator.

11 . The method of claim 1 ,
wherein the low frequency broadband signal comprises a sinusoidal waveform multiplied by a window.

12 . The method of claim 11 ,
wherein said applying the low frequency broadband signal and measuring the second response is repeated multiple times; and wherein for each time of the multiple times, one or more of the following is adjusted:
a frequency of the sinusoidal waveform;
an amplitude of the sinusoidal waveform;
an integer number of cycles of the sinusoidal waveform; and
a type of the window.

13 . The method of claim 11 ,
wherein the high frequency signal is sufficiently higher than a frequency of the sinusoidal waveform of the low frequency broadband signal to avoid overlap in respective frequency responses thereof.

14 . The method of claim 1 ,
wherein the high frequency signal is sufficiently high to avoid interference with the first response from a mechanical resonance of the electromechanical actuator.

15 . The method of claim 14 ,
wherein the high frequency signal is approximately an order of magnitude higher than a resonant frequency of the electromechanical actuator.

16 . The method of claim 1 ,
wherein the high frequency signal is outside a band of a resonant frequency of the electromechanical actuator.

17 . The method of claim 1 ,
wherein said estimating the mechanical parameters comprises:
calculating a back emf voltage using the estimated electrical parameters and the measured second response; and
using the calculated back emf voltage and the measured second response to estimate the mechanical parameters.

18 . The method of claim 1 ,
wherein the electrical parameters comprises a direct current (DC) electrical resistance (Re); and wherein said estimating the electrical parameters comprises:
estimating Re based on the first response; and
applying a predetermined scaling factor to the estimated Re to compensate for shift of a real component of an impedance of a coil portion of the electromechanical actuator at high frequency.

19 . The method of claim 1 ,
wherein said estimating the electrical parameters comprises compensating for an offset of a circuit used to measure the first response.

20 . The method of claim 1 ,
wherein the electrical parameters comprise a direct current (DC) electrical resistance (Re) and an electrical coil inductance (Le) of the electromechanical actuator; and wherein the mechanical parameters comprise a resistance at resonance (Res), resonant frequency (F 0 ), and quality factor (Q) of the electromechanical actuator, or equivalents thereof.

21 . A non-transitory computer-readable storage medium having computer program instructions stored thereon to implement a method comprising:
applying a high frequency signal to an electromechanical actuator and measuring a first response of the electromechanical actuator to the high frequency signal; estimating electrical parameters of the electromechanical actuator based on the first response; applying a low frequency broadband signal to the electromechanical actuator and measuring a second response of the electromechanical actuator to the low frequency broadband signal; and estimating mechanical parameters of the electromechanical actuator based on the second response and the estimated electrical parameters.

22 . The non-transitory computer-readable storage medium having computer program instructions stored thereon to implement the method of claim 21 ,
wherein said applying the high frequency signal and said applying the low frequency broadband signal are performed concurrently.

23 . The non-transitory computer-readable storage medium having computer program instructions stored thereon to implement the method of claim 22 ,
wherein the high frequency signal and the low frequency broadband signal are selected such that they do not produce harmonics that interfere with each other.

24 . The non-transitory computer-readable storage medium having computer program instructions stored thereon to implement the method of claim 21 ,
wherein said applying the high frequency signal is performed prior to said applying the low frequency broadband signal.

25 . The non-transitory computer-readable storage medium having computer program instructions stored thereon to implement the method of claim 21 ,
wherein said applying the high frequency signal is performed after said applying the low frequency broadband signal.

26 . The non-transitory computer-readable storage medium having computer program instructions stored thereon to implement the method of claim 21 , further comprising:
said estimating the electrical parameters and the mechanical parameters of the electromechanical actuator during calibration of the electromechanical actuator during manufacture of a device that includes the electromechanical actuator.

27 . The non-transitory computer-readable storage medium having computer program

Assignees

• Cirrus Logic Int Semiconductor Ltd

Inventors

• Janko Marco
• Reynaga Jorge
• Yong Chin
• Lindemann Eric
• Marchais Emmanuel
• Sepehr Hamid
• Konradi Vadim
• Kurek Michael
• Rossi Filippo
• Lal Anil
• Khenkin Aleksey

Classifications

• B06B2201/40

  with testing, calibrating, safety devices, built-in protection, construction details · CPC title

• G01R35/005

  Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references (G01R33/0035, G01R35/002 take precedence) · 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

• H04R29/003

  of the moving-coil type · CPC title

• B06B1/0215

  for generating pulses, e.g. bursts of oscillations, envelopes · CPC title