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Dual three-phase machines are attractive due to advantages such as inherent fault tolerance. During postfault situation, the same magneto-motive force as in healthy operation should be maintained. Furthermore, it is also important to minimize the copper losses. Several strategies have been proposed to improve the postfault performance under open-phase fault. The maximum-torque (MT) strategy obtains...
Ideal Hall sensors installation interval is 120° electrical angle, however, the inevitable mechanical installation error may cause Hall signals delay or advance, aggravating seriously electromagnetic torque ripple. This paper presents a novel compensation method for commutation torque ripple reduction of Brushless DC motor (BLDC motor) with misaligned Hall sensors. First of all, by comparing phase...
The output torque of switched reluctance motor (SRM) can be controlled by flowing an appropriate current through the armature windings. In general, current hysteresis control has been applied. However, there is a problem that acoustic noise generated from the SRM at the driving tends to become large. Then, there are reports that PWM control has been applied to suppress the acoustic noise. This paper...
The output torque of an interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) inverter. In this paper, the effect of the load torque on the iron losses of an IPMSM is studied by investigating three driving conditions, namely no-current, no-load and load conditions. The experimental data demonstrates that a torque increase...
This paper presents the advances in the construction of a test platform whose main objective is to develop and validate control strategies on a traction wheel motor for electric bicycles (EB). It serves as a tool to evaluate strategies of torque and speed control, regenerative braking, pedaling assistance, among others. In the future, it is expected to obtain a controller to achieve a higher dynamic...
This paper investigates the optimum phase number for multiphase PWM inverters. The input current ripple is used as a performance indicator. Analysis results show that phase number more than nine cannot provide significant input current ripple reduction. Experimental results are included in this paper to show the validity of the proposed analysis method.
The active mode rehabilitation robot is recently developed to help paralysis patients in improving their capability. The robot is usually completed with load and weighting mechanism. This paper presents an alternative weighting mechanism of active mode rehabilitation robot by using spiral spring as load source. PI controller is used to ensure the link reaching its last position by controlling the...
In order to reduce noise and vibration in switched reluctance motors (SRM), many kinds of commutation methods have been proposed. One of them is well-known as 2-stage commutation method. However, it has a defect which is revealed particularly when SRM is operated at high speed and high load condition. In this study, through the magnetic-structural coupled analysis using FEM and the mathematical analysis...
Brushless DC motor has been becoming more popular in industry, electric and aerospace applications, making the control for four-quadrant operation of Brushless DC motor greatly significant. This paper presents pulse width modulation (PWM) control mode for four-quadrant operation of Brushless DC motor, which can realize both motoring and braking operation at the same rotation direction. Based on the...
The ultimate goal of a single-wheel mobile robot is to maintain balance and to navigate on its terrain autonomously. To become an autonomous vehicle, it is required to stand up and drive by itself. In this paper, a controllable balancing angle of the single-wheel mobile robot, GYROBO developed previously, is found by empirical studies. A dynamic equation of the gyroscopic effect between a gimbal and...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
This paper presents a simple method for calculating the efficiency map of a Permanent Magnet Synchronous Machine (PMSM) for traction applications. The calculation uses motor nameplate data only. This is useful in e.g. design phase of an electric vehicle where the efficiency map is required to estimate the range based on a given driving cycle. The method is experimentally validated with a 100kW, 191...
A control strategy with commutation time shortened is proposed to reduce the commutation torque ripple for brushless DC motor. The shorter commutation time favors the crossing-zero detection of back electromotive force in occasion of sensorless control, and meanwhile enhances the motor operation performance. In this paper, the theoretical background on commutation time is given, and on premise of...
In the proposed method, inverter DC link voltage is controlled in proportion to the motor terminal voltage rather than maintaining a constant value. The motor can be driven at lower voltage and driving point remains at where current is at its smallest so system losses can be reduced. In this paper, in order to realize such control method, it is studied about the transient state and the DC link voltage...
The impact of position sensing dynamics, including time-delays caused by magnetics, electrical transmission of sensed signals and A/D conversion, on feedforward current control of permanent magnet synchronous machine (PMSM) drive systems are presented in this paper. Further, the effect of misalignment of the position sensor zero with the machine back-EMF is also presented. The different error sources...
This paper investigates a method of reducing vibration property of a permanent-magnet synchronous motor (PMSM) with dual three-phase windings, especially focusing on carrier harmonic component. Carrier phase shift pulse width modulation (PWM) which makes any difference between PWM carrier phase of 1st winding and 2nd winding, is applied to 24-slot 20-pole PMSM. A tested motor is manufactured and measured...
This paper describes the implementation of a simple, robust and cost-effective sensorless control technique for PMSM machines. The method uses stator current derivative measurements made in response to certain PWM vectors. In this work the derivatives are created from measurements made with standard hall-effect sensors (at the start and end of switching vectors), meaning that specialist transducers,...
Information about tlie torque produced by an electrical motor is needed in many applications such as hybrid drivetrains and in some applications where the shaft torque cannot be measured directly e.g. because of vibrations or other physical limitations. This paper investigates the torque determination accuracy using the voltage and current time domain data obtained from motor terminals using a power...
This paper focuses on the problem of servo control for automatic adhesive crystal orientation instrument. A three-loop cascade control structure is proposed based on the vector control theory. According to the process requirements of the equipment, PI controllers are employed in a current loop and a position loop. For a speed loop, an internal model controller is designed based on the internal model...
This paper presents an induction motor drive using a method of direct torque and stator flux control. One disadvantage of the algorithm is a variable switching frequency of a voltage source inverter although it is used a constant period for the direct torque control processing in a digital signal controller. It is difficult to carry out a good filtration of the variable switching frequency; therefore...
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