A Drive System Applied to Brushless DC Motor
A brushless DC motor and drive system technology, applied in the direction of speed/torque control of a single motor, can solve the problems of narrow field weakening operation range of brushless DC motor, hindering the forward movement of the rotor, and the speed cannot continue to increase, etc. Weakening speed range, preventing breakdown, and absorbing the effect of terminal voltage spikes
Inactive Publication Date: 2015-07-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Circulation will generate an additional torque that hinders the forward movement of the rotor, causing the total torque to drop sharply, and the speed cannot continue to increase
The circulating current of the inverter circuit is a key factor that causes the field-weakening operating range of the brushless DC motor to be too narrow
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the intended invention purpose, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0026] Such as figure 2 As shown, a drive system applied to a brushless DC motor of the present invention includes first to sixth power field effect transistors VT connected between the DC input terminal and the ground with a three-phase bridge inverter drive circuit structure i_L ,i=1.2.3.4.5.6, in the first to sixth power field effect transistor VT i_L , i=1.2.3.4.5.6 is also connected in parallel with an identical power field effect transistor, that is, the seventh to the twelfth power field effect transistor VT i_R ,i=1.2.3.4.5.6; where the first to sixth power field effect transistor VT i_L , the drains of i=1.2.3.4.5.6 are respectively connected to the drains of the power field effec...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a driving system for a brushless direct current motor. The driving system for the brushless direct current motor comprises a first power tube to a sixth power tube connected between a direct current input end and the ground through a three phase bridge type inverter driving circuit structure and the same power pipes, namely, a seventh power pipe to a twelfth power pipe which are respectively in parallel connection with the first power tube to the sixth power tube. Turn-off and turn-on of the twelve power pipes are controlled by controlling signals, the driving system for the brushless direct current motor overcomes the defects that due to the fact that losses of circulation and follow current exist during a traditional brushless direct current motor conducts field weakening control, torque in a flux weakening area is sharply declined and a flux weakening speed adjustable range is narrow, so that the flux weakening speed ratio of the brushless direct current motor is improved.
Description
technical field [0001] The invention relates to a motor drive system, in particular to a drive system applied to a brushless DC motor. Background technique [0002] In recent years, with the continuous improvement of the cost performance of rare earth permanent magnet materials, permanent magnet motors have been used more and more due to their advantages such as simple structure, high power density, and large output. In many fields such as aerospace, electric vehicles, CNC machine tools, household appliances, disk drives, and wind power generation, permanent magnet brushless DC motors have become the best choice for comprehensive performance. In quite a few occasions, the brushless DC motor needs to work at a working state higher than the rated speed, but the excitation magnetomotive force of the permanent magnet motor is generated by the permanent magnet and cannot be adjusted, so its speed regulation range is not wide enough, and it is often necessary to increase The spee...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08
Inventor 宋哲王友仁鲁世红
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS