Rotor imbalance causes undesirable synchronous vibrations of displacement, force and torque. An active vibration control (AVC) method achieving the minimum torque within a desired displacement is presented in an magnetic bearing (AMB) system. First, dynamics AMB system with static dynamic are introduced, dimensional relationships rotation, geometric inertial axes rotor described. Demands AVC analyzed, results indicate that rotation axis has to be controlled move along center line inclination...

For a magnetically suspended control moment gyroscope with strong gyroscopic effects, the whirl mode (nutation and precession) stability of active magnetic bearing (AMB) rotor system has always been challenging problem. This article proposes robust method combined regional pole assignment to achieve in AMB-rotor system. First, physical model multi-degree-of-freedom is analyzed detail, state-space established. Then, effects varying speed are considered as bounded parameter perturbation...

The output stability of the displacement sensors is essential to enhance reliability active magnetic bearings in high-temperature applications. This paper proposes a novel temperature drift compensation method for exponential hysteresis characteristics eddy current sensors. transient thermal analysis sensing assemblies demonstrate that errors are mainly induced by variation effect: one dynamic lag between probe coil and air gap, other target material gap. An auxiliary device consisting plate...

The self-sensing magnetic bearing technology offers significant cost savings and the potential advantages for dynamics performance due to its fundamental sensor-actuator collocation. Based on active (AMB) driven by a 2-level pulse width modulation (PWM) switch power amplifier, an analog circuit was designed estimate rotor position through extracting component information of current ripples. This paper addresses two key challenges displacement AMB-rotor systems: one is how accurately extract...

The harmonic current in active magnetic bearing (AMB) system usually results from rotor unbalance and sensor runout. It not only causes considerable vibration, but also brings about the power saturation instability of AMB especially for high-speed rotor. Therefore, a novel parallel finite dimension repetitive controller (PFDRC) is proposed to restrain this paper. Compared with conventional (RC), PFDRC introduces limited imaginary poles, so that problem infinite poles RC endanger stability...

During gimbal maneuvering, the dynamic characteristics of active magnetic bearing (AMB) rotor system is an important concern for applications magnetically suspended double-gimbal control moment gyro (MSDGCMG). Both static torques caused by motions and twisting motion will have impact on performance high-speed rotor. This paper explores a modified current integral feedforward (CIF) scheme to improve its response. Using regulator, CIF method applied supply torque permanent magnets...

In order to achieve the attitude maneuver performance of noncontact close-proximity formation satellite architecture, this paper presents a compound control strategy with variable-parameter sliding mode and disturbance observer-based feedforward compensation. Firstly, is proposed guarantee payload module. Secondly, collision avoiding compensation synchronization two separated modules within small air clearance constraint Lorentz actuator. Finally, physical air-floating platform established...

A novel non-contact spacecraft architecture with the extended stochastic state observer for disturbance rejection control of gravity satellite is proposed. First, precise linear driving voice-coil actuators are used to separate whole into payload module and service module, build an ideal loop dynamics module. Second, enveloped construct overall nonlinear external terms internal coupled enabling controller design turned form simple bandwidth-parameterization tuning in frequency domain. As a...

Based on the design concept of dynamic and static isolation, disturbance-free payload (DFP) satellites can isolate effects interference sensitive payloads, realize high-precision control better than a traditional spacecraft. Among these, non-contact annular electromagnetic stabilized spacecraft (NCAESS) effectively alleviate output problems such as six-degree-of-freedom coupling nonlinear found in As key actuator, driving current actuator (NCAEA) will have direct impact attitude performance...

This paper explores a decoupling control scheme based on the linear active disturbance rejection (LADRC) for couplings of high-speed magnetic suspension rotor (MSR) system with significant gyroscopic effects supported by bearings (AMBs). Firstly, coupling disturbances caused four radial DOFs MSR are analyzed. The generalized mathematical model channels is established, and relationship between phase lag power amplifier speed also obtained. Since nutation instability mainly introduced lag,...

The magnetically suspended rotor (MSR) in a double-gimbal control moment gyro (DGMSCMG) is complicated system with multivariable, nonlinearity, and strong coupling. Not only the torsional motion of MSR coupled depend on rotating speed but also its translational motions at same axis are due to asymmetric position stiffness magnetic bearings. Besides, encounters nonlinear coupling torque gimbals' movements. These problems influence accuracy MSR. To resolve these issues, this work presents...

For the uncertainty of current stiffness and unbalanced vibration during stable operation magnetic suspended control moment gyro(MSCMG), method composite hierarchical anti-disturbance control(CHADC) is implemented to realize stability bearing system. The parameter unmodeled dynamics are attenuated by robust H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∞</sub> controller, when harmonic disturbances observed compensated disturbance observers....

Due to phase delay and other non-ideal factors, the commutation error is inevitable in drive of brushless DC (BLDC) motor with without position sensors. Inaccurate leads current deviating from back electromotive force, which increases losses motor. In order improve performance BLDC motor, a robust correction method for proposed based on asymmetry characteristic terminal voltage when occurs. The effectiveness was evaluated by experiments.

The structure eigen mode vibration of rotor has severe influence on the stability magnetically suspended (MSR) system in a control moment gyroscope (CMG). notch frequency traditional filter based transfer function continuous domain is easy to be offset during quantification program. In order effectively suppress MSR and resolve issue filter, all-pass that designed discrete proposed. this kind parameters analyzed after added controller. Both simulation experimental results are given show...