An electromagnetic incremental-motion actuator which converts digital pulse inputs to analog output motion. The device is also termed a step motor. When energized in a programmed manner by a voltage and current input, usually dc, a step motor can index in angular or linear increments. With proper control, the output steps are always equal in number to the input command pulses. Each pulse advances the rotor shaft one step increment and latches it magnetically at the precise point to which it is stepped. Advances in digital computers and particularly microcomputers revolutionized the controls of step motors. These motors are found in many industrial control systems, and large numbers are used in computer peripheral equipment, such as printers, tape drives, capstan drives, and memory-access mechanisms.
Stepper motors are also used in numerical control systems, machine-tool controls, process control, and many systems in the aerospace industry. See also Computer graphics; Computer numerical control; Computer peripheral devices; Control systems; Digital-to-analog converter; Process control.There are many types of step motors. Most of the widely used ones can be classified as variable-reluctance, permanent-magnet, or hybrid permanent-magnet types. A variable-reluctance step motor is simple to construct and has low efficiency. The permanent-magnet types are more complex to construct and have a higher efficiency.
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2010年6月29日星期二
The value of stepper motor control
It is subject to plugging which then negates the pressure communication and the functioning of the main valve which generates the pressure pulse. The second issue is the limitation to how rapidly the solenoid can be fired with the limits put on the system by its power supply, typically batteries. The valving mechanism can only be fired as rapidly as the capacitors can be charged delivering the power to the solenoid.
In addition the issue of plugging with the rotary main valve pulser is eliminated since the signaling valve is a poppet orifice not a rotary valve which when closed to generate its positive pulse signal creates very small restrictions around the rotor stator elements. It is during this phase that a rotary pulser design is very susceptible to plugging and jamming as the entire flow of the mud through the drill string (and the rotary signaling valve) must pass this restricted area.Stepper motor control forces act to lock the valve and increase as the flow area in the closed position becomes restricted with debris and the pressure increases. On the other hand a poppet orifice linear pulser in the same pressure pulse generation stage does not have the same locking forces applied due to its geometry. In some arrangements it the forces would actually force the valve open.
In addition the issue of plugging with the rotary main valve pulser is eliminated since the signaling valve is a poppet orifice not a rotary valve which when closed to generate its positive pulse signal creates very small restrictions around the rotor stator elements. It is during this phase that a rotary pulser design is very susceptible to plugging and jamming as the entire flow of the mud through the drill string (and the rotary signaling valve) must pass this restricted area.Stepper motor control forces act to lock the valve and increase as the flow area in the closed position becomes restricted with debris and the pressure increases. On the other hand a poppet orifice linear pulser in the same pressure pulse generation stage does not have the same locking forces applied due to its geometry. In some arrangements it the forces would actually force the valve open.
Stepper motor control Introduction
The control valve circuit used to date on many poppet orifice pulsers utilized in the Measurement While Drilling industry consists of a small poppet and orifice arrangement. This allowed a low power supply draw and a simple system design. There were several negatives to this arrangement. The first was the small dimensions inherent with this design criterion.
A stepper motor powered rotary valve solves both of these issues. It allows a much larger flow path through its elements allowing improved tolerance to debris in the drilling fluid. As well its speed is much greater than the solenoid powered poppet orifice control valve. The benefits go further. The stepper motor powered rotary valve has much more flexibility than the “on- pause –off – pause” pattern limit of a linear poppet orifice valve. The stepper motor allows precise positioning, direction change, as well as rotational speed variations to alter the movement and resulting reaction of the main poppet orifice pulse generation valve. In effect many of the pulse patterns generated by a rotary main valve pulser can be emulated with the linear poppet orifice style valve as well as some that can not.
A stepper motor powered rotary valve solves both of these issues. It allows a much larger flow path through its elements allowing improved tolerance to debris in the drilling fluid. As well its speed is much greater than the solenoid powered poppet orifice control valve. The benefits go further. The stepper motor powered rotary valve has much more flexibility than the “on- pause –off – pause” pattern limit of a linear poppet orifice valve. The stepper motor allows precise positioning, direction change, as well as rotational speed variations to alter the movement and resulting reaction of the main poppet orifice pulse generation valve. In effect many of the pulse patterns generated by a rotary main valve pulser can be emulated with the linear poppet orifice style valve as well as some that can not.
2010年6月22日星期二
If you want to ask how does a stepper motor work…
There are several parts of a stepper motor, for example, a permanent magnet rotating shaft, called the rotor, and electromagnets on the stationary portion that surrounds the motor, called the stator. One complete rotation of a stepper motor. We can see that the rotor is beginning at the upper electromagnet, which is currently active (has voltage applied to it). To move the rotor clockwise (CW), the upper electromagnet is deactivated and the right electromagnet is activated, causing the rotor to move 90 degrees CW, aligning itself with the active magnet. This process is repeated in the same manner at the south and west electromagnets until we once again reach the starting position.
As many people find it difficult to cope with stepper motors and other motors at the same time, some people begin to take an active part in taking care of their stepper motors. Stepper motors are electromagnetic actuators that convert input pulses to output motion. They are different from ordinary direct current (DC) motors in that, when energized by a voltage or current pulse train, the step motor moves an incremental amount for each pulse it reads.Stepper motors are commonly used in computer peripheral equipment such as printers, tape drives, and disk drives. Additionally, they are used in machine tool controls, process control systems, robots, and other industrial applications.
As many people find it difficult to cope with stepper motors and other motors at the same time, some people begin to take an active part in taking care of their stepper motors. Stepper motors are electromagnetic actuators that convert input pulses to output motion. They are different from ordinary direct current (DC) motors in that, when energized by a voltage or current pulse train, the step motor moves an incremental amount for each pulse it reads.Stepper motors are commonly used in computer peripheral equipment such as printers, tape drives, and disk drives. Additionally, they are used in machine tool controls, process control systems, robots, and other industrial applications.
2010年6月18日星期五
Wantmotor.com, established in 1995, specializes in production and development of stepper motor and driver. In the developing process, our company has provided many top-grade step motor and controlling products for many industries in China depending on one qualified production and development team. Meanwhile, our applicable fields refer to robot, electronic automatic equipment, medical instrument, ad instrument, lighting& audio equipment, printer, textile machinery and outside applicable equipment of computer.
It easily can be seen by every person that depending on one complete set of checkout equipment, perfect methods and strict quality standard and at the same time, our company tries our best to enhance quality and performance of products and provides life-long technical service and after-sale service for every clientele.
From what we have discussed above, we can clearly see that at present, our main products are 42BYG series, 42BYGH series, 57BYG series, 57GH4100 series, 57BYGH series, 86BYG series, 85BYGH series four-phase (two-phase) mixing type step motor and relevant driver for step motor, such as XCW220、CW230、CW250AC、CW260C、CW1108 series. Furthermore, our company can also provide systematic project for application. Welcome for domestic and foreign merchants for negotiation and cooperation.
It easily can be seen by every person that depending on one complete set of checkout equipment, perfect methods and strict quality standard and at the same time, our company tries our best to enhance quality and performance of products and provides life-long technical service and after-sale service for every clientele.
From what we have discussed above, we can clearly see that at present, our main products are 42BYG series, 42BYGH series, 57BYG series, 57GH4100 series, 57BYGH series, 86BYG series, 85BYGH series four-phase (two-phase) mixing type step motor and relevant driver for step motor, such as XCW220、CW230、CW250AC、CW260C、CW1108 series. Furthermore, our company can also provide systematic project for application. Welcome for domestic and foreign merchants for negotiation and cooperation.
2010年6月11日星期五
Stepper motors and printers
The computer should give priority to the optimization of its printer. Success of such printers hinge on contribution from the stepper motors. The trend is not restricted to printers to do this, but is also evident among other machines. So what makes an inkjet printer to perform brilliantly? There are a number of key mechanisms found in all such printers that make them tick. The most essential and delicate part of any printer is its print head. It encloses the ink-emanating nozzles. The ink cartridges embrace the actual ink that is noshed into the head. The stepper motor gives power to the print head, thrusting it back and forth cross ways on the paper. A stabilizer bar makes sure that the actions of the print head are controlled and accurate.
Many buyers lack the capacity to distinguish between good and bag printers. These printers are categorized based on their costs and purposeful features. Consumers normally prefer a printer that tenders various features at the least possible cost. The terms related to warranty are also the main factor in shaping the trustworthiness of any printer. These issues should be considered for selecting the best among all printers available in the market.
Many buyers lack the capacity to distinguish between good and bag printers. These printers are categorized based on their costs and purposeful features. Consumers normally prefer a printer that tenders various features at the least possible cost. The terms related to warranty are also the main factor in shaping the trustworthiness of any printer. These issues should be considered for selecting the best among all printers available in the market.
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