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This paper introduces a time stepping finite element analysis (FEA) model coupling circuit-field and movement used in analyzing multi-phase permanent magnet brushless DC (BLDC) motors, presents the element analysis about the coupling problem of control circuit and field, adopts the interpolation moving boundary method to solve rotation problem of the rotor, and employs the above model to analyze the...
This paper presents a direct torque control technique for brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the brushless DC motors. In order to solve the problems associated with conventional PI speed controller, a speed control based on fuzzy logic controller is proposed to...
High speed permanent magnet motor is widely used and has gained more and more attention due to high power density and efficiency. However, its high speed brought up large losses and high temperature rise in the motor. In order to avoid the demagnetization of permanent magnet and damage of winding insulation caused by temperature, multiphysics thermal analysis is applied on the high speed brushless...
This paper presents an experiment method designed to separate the iron losses due to armature magnetic field from other losses for permanent magnet brushless DC (PMBLDC) motor. The iron losses due to armature magnetic field for the prototype PMBLDC motor with carbon fiber retaining sleeve of 30kW are tested. The temperature rise tests have been done for the prototypes with carbon fiber retaining sleeve...
This paper describes the shaft voltage reduction achieved by the brushless DC motor for air conditioning driven by the voltage source inverter. First, the simplified equivalent circuit of the concentrated winding brushless DC motor is derived based on the common mode equivalent circuit where stray capacitance is taken into account. Then, the electrostatic capacity distributions between winding and...
Compared with the conventional vehicles, electric vehicles (EV) has many advantages, such as absence of emissions, high efficiency, and independence from petroleum. In this paper, a Brushless DC motor (BLDCM) is used in the EV and active disturbance rejection controller (ADRC) has been applied to the speed control of the system. It can highly enhance the dynamic and steady state performances of the...
To design high performance sensorless Brushless DC Motor control system, computer simulation technology is adopted to analyze the process of three-step starting process. Firstly, Park transform and Clark transforms are used to build the mathematical model of the first step, pre-position. To avoid striking current, a scheme of pre-position with gradually increasing bus voltage is proposed in the paper,...
Applying the principle of back-electromotive force(EMF), a sensorless brushless DC motor-driver was designed in this paper, and detailedly analyse the running-principle of the sensorless brushless DC motor, and then the motor-driver was used in a hydraulic pressure system of new type Dual Clutch Transmission. The experiment and testing-date indicated the motor-driver has a highly working-value.
Brushless DC motor system, the rotor position signal is essential for the normal operation of the entire system. Past rotor position sensor signal is detected by the position, but sensors are more affected by environmental drawbacks. Currently, no position sensor control technology has become a hot topic. In this paper, using back-EMF zero-crossing detection sensors BLDCM position of the rotor system,...
The paper proposes a model of brushless DC motor considering behavior of the motor during commutation. The torque characteristic of BLDC motor presents a very important factor in design of the BLDC motor drive system, so it is necessary to predict the precise value of torque, which is determined by the waveforms of back-EMF. After development of simple mathematical model of the BLDC motor with sinusoidal...
In the paper were examined the possibilities to control a high-speed sensorless PM BLDC motor, with a target speed 100 000 rpm and power 1 kW, designed in the Department of Power Electronics, Electrical Drives and Robotics - KENER, Silesian University of Technology. The article describes methods based on phase voltages integration and the third harmonic, also presents a method of open-loop starting...
Estimation of rotor position and speed plays an important role to avoid skipped step and reduced resonance in Hybrid Stepper Motor (HSM). In this paper, the effect of various phase excitation schemes on estimation of rotor position and speed in the presence of resonance is studied. A method has been proposed to identify the resonance from the frequency content of measured phase currents well before...
This paper describes a 5-phase Brushless DC motor designed for an electro-hydrostatic actuation system. The foundation of the design is a motor with compact structure, low weight, fault tolerance and high reliability. The motor power rating is 12kW at 12,000 rpm and a “wet” form of construction is used where hydraulic oil is present in the motor in order to reduce the number of oil seals of the EHA...
Many robotic actuators must generate high torques and accelerations. Exterior-rotor brushless motors seem better suited for these tasks than conventional interior-rotor brushless motors. Models of these two motor types were used to calculate benchmarks and evaluate motor performance in simulated tasks for different motor geometries. Exterior-rotor motors had higher motor constants and efficiency,...
This paper presents magnetic suspension performance of a bearingless brushless dc motor. The new motor structure, the winding distribution in the stator, the principle of suspension force generation and the magnetic suspension control strategy for the bearingless brushless dc motor have been proposed. The rotational torque and suspension force have been analyzed by Finite Element Method (FEM) using...
Magnetic flux pattern and magnetization curve of Exterior Rotor Permanent Magnet Brushless DC (ERPMBLDC) Motor are obtained using an advanced numerical method called Finite Element Method. This method better suits to deal with the complicated internal structure of the machine and non linear magnetic characteristics. Finite Element method Magnetics (FEMM) software Version 4.2 is used to simulate two...
This paper presents the optimal design of a surface mounted permanent-magnet (PM) Brushless direct-current (BLDC) motor meant for spacecraft applications. The spacecraft applications requires the choice of a motor with high torque density, minimum cogging torque, better positional stability and high torque to inertia ratio. Performance of two types of machine configurations viz Slotted PMBLDC and...
This paper designs a kind of BLDC sensor less control system for vehicle fuel pump. The control system uses 78F9222 of NEC as a core control unit, and uses the Back-EMF method to achieve the sensor less control for BLDC. The system can implement over-current protection, over voltage protection and over temperature protection. Loading test shows that the control system has high performance to meet...
This paper focuses on various aspects of Space Vector Modulation based Field Oriented Control of Trapezoidal Permanent Magnet Synchronous Motors. The purpose is to introduce in a concise manner the fundamental theory, main results and practical applications of Field Oriented Control (FOC) for Brushless DC motors. The primary focus is on controlling the motor in d-q axis using field oriented control...
This paper presents a direct torque control technique for Brushless DC motors with non-sinusoidal back electromotive force. Direct torque control has some benefits such as faster torque response and reduced torque ripple for driving the Brushless DC motors. The Sliding mode observer, which is robust to parameter uncertainties, can be used to estimate the back-EMF and generate the torque. It is employed...
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