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GB/T 47113-2026Stability evaluation of active magnetic bearings (English PDF)

主动磁悬浮轴承稳定性评价

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 28, 2026

Implementation date

August 1, 2026

Scope

GB/T 47113-2026 is the English-translated version of 主动磁悬浮轴承稳定性评价.

GB/T 47113-2026 is the Chinese standard "Stability evaluation of active magnetic bearings". Its scope clause reads: This document specifies the stability evaluation requirements and methods for active magnetic levitation bearing-supported rigid rotor systems, and classifies stability through frequency domain analysis.

Qualitative rating describes the testing methods and evaluation criteria. This document applies to the stability evaluation of a rigid rotor system supported by an active magnetic levitation bearing in rotating machinery under given operating conditions.

This document applies to rigid rotor systems supported by active magnetic levitation bearings, where rotor vibration displacement is the control objective (hereinafter referred to as "active magnetic levitation bearings").

For active magnetic levitation bearing systems that use other variables as control targets, please refer to this document for implementation. Note. This document serves as a reference for the stability evaluation of a flexible rotor system supported by an active magnetic levitation bearing under given operating conditions.

This document does not cover rotor overcritical rotation. The problem of vibration control at high speeds. Its clauses include terms and definitions.

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Document preview — GB/T 47113-2026

National Standard of the People's Republic of China

ICS: 29.100.99
Classification: K 65

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4 symbols
5 Requirements
6.Test Methods
6.1 Sensitivity Function Determination
6.2 Phase margin and gain margin determination
7.Stability Evaluation Criteria
7.1 Evaluation Area
7.2 Sensitivity Function Evaluation
7.3 Phase Margin and Gain Margin Evaluation
Appendix A (Informative) Measurement Conditions for Stability Evaluation Indicators
Appendix B (Normative) Method for Determining the Frequency Response of Transfer Function
Appendix C (Informative) Explanation of the Differences Between Sensitivity Function, Phase Margin, and Gain Margin
References

1 Scope

This document specifies the stability evaluation requirements and methods for active magnetic levitation bearing-supported rigid rotor systems, and classifies stability through frequency domain analysis.

Qualitative rating describes the testing methods and evaluation criteria.

This document applies to the stability evaluation of a rigid rotor system supported by an active magnetic levitation bearing in rotating machinery under given operating conditions.

For active magnetic levitation bearing systems that use other variables as control targets, please refer to this document for implementation.

Note. This document serves as a reference for the stability evaluation of a flexible rotor system supported by an active magnetic levitation bearing under given operating conditions. This document does not cover rotor overcritical rotation.

The problem of vibration control at high speeds.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are listed below.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 2900.56 Electrical Engineering Terminology - Control Technology

GB/T 46078 Terminology for Magnetic Levitation Power Technology

3 Terms and Definitions

The terms and definitions defined in GB/T 2900.56 and GB/T 46078, as well as the following terms and definitions, apply to this document.

3.1 stability

When subjected to an initial offset or disturbance that is sufficiently small relative to the rest position, the system state variables and output variables can be kept at that position sufficiently.

System characteristics within a small neighborhood.

[Source. GB/T 2900.56-2008, 351-21-30]

3.2 Stability of active magnetic bearings

Under given operating conditions, the dynamic response of a rotor system supported by an active magnetic levitation bearing can recover after being disturbed in equilibrium.

The ability to return to the original equilibrium state or converge to a new equilibrium state.

3.3 Closed-loop transfer function

For a linear time-invariant system under closed-loop control with zero initial conditions, the Laplace transform of the output variable and the Laplace transform of the corresponding input variable are...

The ratio of the Gaussian transform.

Note. The closed-loop control process of the active magnetic levitation bearing system based on displacement control is shown in Figure 1.Its closed-loop transfer function Gc is the ratio of the displacement measurement signal V3 to the reference signal V3.

The ratio of the Laplace transform of the displacement signal V1, i.e., Gc(s) = V3(s)/V1(s).

In the formula.

Gc -- Closed-loop transfer function;

s -- Laplace operator.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Normative references

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