scholarly journals Experimental investigation of the generator mode for a brushless dc motor at an increased rotational speed

2021 ◽  
pp. 25-29
Author(s):  
Vyacheslav Kortunov ◽  
Andrii Masliennikov ◽  
Andrii Yehorov ◽  
Oleksii Duniev
Keyword(s):  
Output Power ◽  
Rotational Speed ◽  
Power Plants ◽  
Experimental Studies ◽  
Dc Motor ◽  
Nonlinear Dependence ◽  
Brushless Dc Motor ◽  
Brushless Dc ◽  
First Case ◽  
Wide Range

This article deals with a commercially available direct drive brushless DC motor that was investigated in the generator mode at an increased speed above the rated one. During the conducted experiments the increase of the generator rotational speed was carried out due to a three-phase asynchronous motor with 5.5 kW rated power and 2920 rpm rated speed, which was further increased by a two-stage belt gearbox with a reduction ratio from 0.16 to 1.6. However, with an increase in the rotational speed, the magnetic losses also increase, which in turn increase the required value of the input mechanical power and lead to thermal overload of the brushless DC machine. An increase the generator rotational speed leads to an increase of the EMF value and, at the same value, of the stator current, leads to an increase the generated power. Throughout the experiment, the voltage was rectified using a diode bridge and bulk capacitor, after that it was connected to a load resistance. The presented calculations of the magnetic power losses for different electrical steel grades clearly demonstrate the nonlinear dependence between the magnetic field frequency and its magnitude. Experimental studies were carried out at different speeds of rotation of a brushless DC machine in a very wide range from 140 rpm to 5228 rpm, moreover, the values of the output power were obtained depending on the rotational speed. It is concluded, that in the generator mode of the brushless DC machine, it is necessary to take into account the feature of the operation at wind power plants, autonomous power supply such as hybrid power plants. In the first case, it is worth limiting the rotational speed from the driven mechanism, and in the second case, this mode of operation may be necessary for partial boosting of output power for short-term use.

scholarly journals Design and Implementation of Single Stage PFC Microcontroller Based Drive For Permanent Magnet Brushless DC Motor

2013 ◽  
pp. 289-293
Author(s):  
Minal A Bodkhe ◽  
Vaishali Nandanwar
Keyword(s):  
Permanent Magnet ◽  
Power Factor ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Brushless Dc ◽  
Three Phase ◽  
Wide Range ◽  
Sinusoidal Input ◽  
Bridge Rectifier ◽  
Permanent Magnet Brushless Dc

In this paper ,a new approach is presented aim at improving the power factor of three phase bridge inverter that equip with permanent Magnet Brushless DC motor(PMBLDCM)drive through microcontroller. Power factor correction converter is used for feeding a three phase bridge inverter based PMBLDC motor drive. The front end of PFC converter is a diode bridge rectifier fed from a step down transformer. In this three phase bridge inverter is operated as electronic commutator of the PMBLDCM .Nearly sinusoidal input current is achieved using. The proposed PMBLDCM drive with PFC converter is designed to run the motor to desired speed. This scheme improves an efficiency of proposed drive system with PFC feature in wide range of the speed and an input AC voltage.

scholarly journals Power Factor Correction in Two Leg Inverter Fed BLDC Drive Using Cuk Dc-Dc Converter

2015 ◽  
Vol 6 (2) ◽  
pp. 196
Author(s):  
A. Purna Chandra Rao ◽  
Y.P. Obulesh ◽  
Ch. Sai Babu
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
High Reliability ◽  
Speed Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Cuk Converter ◽  
Brushless Dc ◽  
Wide Range

Earlier for variable speed application conventional motors were used, but these motors have poor characteristics. These drawbacks were overcome by brushless Dc motor drive. Now days in most of the applications such as industrial, domestic, aerospace, defense, medical and traction etc, brushless DC motor (BLDCM) is popular for its high efficiency, high torque to weight ratio, small size, and high reliability, ease of control and low maintenance etc. BLDC motor is a electronic commutator driven drive i.e. it uses a three-phase voltage source inverter for its operation, electronic devices means there is a problem of poor power quality, more torque ripple and speed fluctuations. This paper deals with the CUK converter two leg inverter fed BLDCM drive in closed loop operation. The proposed control strategy on CUK converter two leg inverter fed BLDCM drive with split DC source is modeled and implemented using MATLAB / Simulink. The proposed method improves the efficiency of the drive system with Power factor correction feature in wide range of the speed control, less torque ripple and smooth speed control.

The Rotational Speed Measurement of Brushless DC Motor Based on STM32 Microcontroller

2013 ◽  
Vol 760-762 ◽  
pp. 891-895
Author(s):  
Meng Bing ◽  
Fang Xiu Jia ◽  
Wen Jin Yao
Keyword(s):  
Real Time ◽  
Measurement System ◽  
Rotational Speed ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Flip Flop ◽  
Brushless Dc ◽  
Speed Measurement ◽  
Trajectory Correction ◽  
Hall Sensors

The brushless DC motor applied on the electric steering gear of trajectory correction projectiles often requires getting real-time rotational speed value. The hall sensors output the hall signals for measurement, after the integration by the D-type flip-flop, an ideal pulse can be produced. Afterwards STM32F103ZE microcontroller is used to calculate the rotational speed value of the motor by the Improved M/T method. The resolution and precision can be analyzed after getting the result. This rotational speed measurement system has high precision and good real-time characteristics. It is significant for the meaning of the correction of the steering gear.

scholarly journals Designing of a BLDC motor bench

2020 ◽  
Vol 10 (2) ◽  
pp. 35-40
Author(s):  
Pálma Kapitány ◽  
József Lénárt
Keyword(s):  
Rotational Speed ◽  
Hydraulic System ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Bldc Motor ◽  
Hydraulic Circuit ◽  
Hydraulic Pump ◽  
Brushless Dc ◽  
Mechanical Connection

This paper deals with designing and development of a bench for the test of a brushless DC motor. The bench contains a hydraulic circuit, which provides a controllable load for the motor. The hydraulic system is equipped with a hydraulic pump and choke valve and a manometer. The mechanical connection between the hydraulic pump and the BLDC motor is designed with two clutches and structure of two sheet plates. The bench contains a torque meter, which is built between the two shafts of the motor and pump. The system can determine rotational speed, torque, current and voltage with respect of the load.

scholarly journals A simple constant switching frequency of direct torque control of brushless DC motor

2019 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Yusnida Ahmad Tarmizi ◽  
Auzani Jidin ◽  
Kasrul Abdul Karim ◽  
T. Sutikno
Keyword(s):  
Direct Torque Control ◽  
Torque Ripple ◽  
Dc Motor ◽  
Torque Control ◽  
Brushless Dc Motor ◽  
Switching Frequency ◽  
Triangular Waveform ◽  
Brushless Dc ◽  
Torque Response ◽  
Wide Range

This paper discusses about direct torque control of Brushless DC motor by injecting the triangular waveform and using PI controller in order to reduce the torque and obtain constant switching frequency. Brushless DC motor are widely used in applications which require wide range of speed and torque control because of robust, longer lifespan, faster torque response and able to operate at high speed.  Unlike conventional three phase DTC of induction machine (IM),the proposed DTC approach introduces two phase conduction mode. Besides that, the magnitude flux is considered constant in which the results only gains from constant torque region. Thus, the flux control loop is eliminated while implement this scheme. Using the triangular waveform that will be compare with actual torque, the proper switching pattern can be selected to control the generated torque and reducing commutation torque ripple. The torque response depends on the speed of the stator flux linkage which is directly controlled by selecting appropriate voltage space vectors from a look-up table to make sure the torque error within the band. The validity of the proposed control scheme for constant switching frequency and reduce torque ripple are verified through simulation and experimental results.

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