Several DC motor power drive chips and their applications
SA60 and LMD18245 are the United States launched Apex Inc. and NS-oriented small and medium-power DC brush motor full-bridge output circuit. They not only have a few external components in the case of the motor power driver, control and protection features such as common, but also have its own characteristics. SA60 is a PWM-type power output chips, power voltage circuit supply for the motor can be up to 80V, The maximum analog input voltage is 5V, PWM carrier frequency can go to 250kHz, the chip can also be connected with an external TTL compatible PWM type signal to synchronize the four-quadrant model in magnitude and direction. SA60 is mainly used in small DC motor, D class power amplifier, bearing incentives and other occasions. LMD18245 chip provide maximum 55V supply voltage for the motor driver, voltage of 12V, maximum sustained output current 3A, peak current up to 6A.
Sensorless brushless motor design
Sensorless brushless motor with simple structure e, reliable operation, easy maintenance and other a series of advantages, it has been widely used in industrial motor controls fields. Brushless DC motor and motor controllers have been the research focus of motor development. Brushless DC motor has small size and high efficiency. It has AC motor’s simple structure, reliable, easy maintenance advantages, but also equipped with has good speed like DC motor. is now widely used in industrial control fields. The control system designed to SP430F201 2 Microcontroller and TB6588FG integrated drive as the core hardware platform, the speed of the microprocessor acquisition TB6588FG feedback pulse, the use of digital potentiometers to adjust voltage for closed loop speed control.
Permanent magnet DC motor’s application in industry and agriculture
A variety of fans, wipers, spray pumps, immobilizers, the rearview mirror, playing air pump of automotive industry use a variety of permanent magnet DC motor. Automatic doors, automatic door locks, automatic curtain, automatic water supply system, towel disposal in Hotels also use permanent magnet DC motor. permanent magnet DC motor are widely used in weapons, equipment, missiles, artillery, satellites, spacecraft , ships, aircraft, tanks, rockets, radar, tanks and other occasions. In industry and agriculture aspect, permanent magnet DC motor is also widely used in electrical and automation control and instrumentation. In medical terms, permanent magnet DC motors’ use is not small, such as a variety of medical equipment, surgical tools, such as brain surgery to open the electric bone saw blade, in particular, the field operations of the various instruments are basically used Magnetic DC brush Motor. Because the price of brush motor is cheaper than brushless motor, so its application is more widely.
How to operate ac motor
There are AC motor and DC brush motor drag in the electric drive program, for long time, because DC motor has a good starting performance, and it can smooth over a wide range of speed and cost, starting, braking and reversing, etc., so it is widely used in starting and speed requirements of high production machinery. DC Drive – straightly in dominate position in the field of variable speed drives. during the Target vehicle design, According to "not only to optimize, but also inherit the" principle, follows the set of mature programs, the use of imported high-performance gasoline generators and electric motors for the car body control system provides power, the voltage is 220VAC; using DC motors to provide power for the target vehicle ; using reversing contactors, DC converter DC motor speed adjustment means to achieve the electric drive problem.
How to make shooting Training more safty
In order to meet the needs of the shooting Training，china and foreign countries have developed several remote target vehicle. In recent years, meet the training requirements for military modernization, there have been some shooting range equipment, drag the target frame by the winch on the track or track-type running gear reciprocating movement target vehicle, But this target vehicle take DC motor or AC motor as power source, which need track and power lines, more facilities and complex maintenance, it is easy out of control in the dusty field. This design uses DC motor driver power control target vehicle, the structure is simple and it is easy to use, Target vehicle speed is adjustable, it does not need to control, so as to solve the long-troubled troops firing training of personnel security. From the economic analysis, the Department does not require the construction of hidden and do not need to set up power lines.
How can we improve the efficiency of energy?
DC motor position servo system is the key components of a natural gas engine electronic motor controls system. this paper adopt the Freescale company's MC9S12 MCU, combined with the motor armature current position feedback and testing, developed the digital PWM servo motor drivers. The driver takes full advantage of the embedded microcontroller resources to achieve the position, velocity and current three-loop control strategy. As China increasingly serious problem of energy shortage, in the practice improve the production of energy efficiency is the trend. However, most oil fields in western China is still exist a large number of associated gas venting phenomenon. Associated natural gas this can be treated by simple separation of direct-drive high-power gas engine, generator and drive into the power grid, thereby enhancing the comprehensive utilization of energy.
DSP’s application in brushless motor
TI introduced the 240XDSP as a brushless DC motor digital control core, consisting of servo system requires very little system components. TMS320F240X is high-performance 16-bit digital signal processor (DSP) U.S.TI launched, which is designed for digital motors controls, The DSP includes a fixed-point DSP core and a series of micro-controller peripheral circuits, to put digital signal processing and computing capability for efficient control of the motor in one, it can replace analog devices in software to easily modify the control strategy revision control parameters, both for fault detection, self diagnostic and communication host computer functions. TMS320LF2407A kernel is TMS320C2XX, the internal use motor controller, under the 20MHz clock frequency, the instruction cycle is only 50ns, and most of all instructions can be completed in one instruction cycle.
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