Coreless vs brushless servo amplifier
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Choosing the Correct Servo
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You can unsubscribe from these updates at any time. Download a PDF of this whitepaper. The creation of small, portable infusion pumps opened a new chapter in medical care.
A patient can receive carefully metered and timed doses of medicine, without requiring a visit to the medical practitioner, allowing life to be less restrictive.
Ambulatory pumps have been developed to deliver insulin, nutritive supplements and anti-cancer drugs. Miniaturization is crucial, for convenience to the user, especially with portable equipment. The patient should not be disturbed by the pump noise, either at rest or in social surroundings. For this reason, portable battery- powered pumps need a very efficient and quiet motor.
Whether it be Brush DC, Brushless DC , or Stepper technologies, there are numerous advantages and disadvantages when choosing a DC motor type, depending on what technology you choose.
In this paper, we will use a small syringe pump as an example. A typical design, is a piston moved by a lead screw, the screw or the nut driven with a micro-motor. See Figure 1. Miniature servo motors used in medical pumps have very specific requirements. To select the electrical motor the design engineer has the choice of different technologies; nevertheless, the primary motor function is to convert electrical power into mechanical power.
The goals of the motor are to:. The designer will select the solution, mostly depending on his experience and background, as the three options can fulfill the same job in the pump.
Each of these technologies presents some advantages and disadvantages, as described in the following table and motor technology sections:. Brush-type motors fall into one of two sub-categories — the iron core and the ironless design.
The latter is usually selected for battery-operated portable pump applications because it has no iron losses. With a DC ironless motor, the majority of the losses are due to the copper losses, which are proportional to the coil resistance copper volume but also to the current squared in the motor. The current in the motor is proportional to the motor torque. System efficiency must be optimized for a battery application.
It will offer a better efficiency. Additionally, while motor diameter is in principle defined by the customer and the application, the larger the motor is, the smaller the joule losses will be for a given torque.
The mechanical power is the torque multiplied by the speed. Intuitively, the best way to increase motor efficiency is to get the power needed while running the motor at high speed. For the same mechanical power, the higher the speed is, the lower the necessary torque and the joule losses will be.
See Figure 2. Ironless motors also have a very low inductance and a commutation with small contact surface and pressure, resulting in a small electrical resistance and a very small friction. Remember: A DC ironless motor with precious metal brushes will have a higher efficiency at high speed. For a given frame size, the torque versus speed and efficiency are roughly equivalent whatever the coil impedance is.
A bigger motor has less iron loss than a smaller motor for the same torque output. This dependency was reduced to the bearing life with the introduction of the brushless motor , which in some applications is a strong advantage.
In a BLDC motor the coils are fixed and the magnet is part of the rotor. Commutation in the coils is done electronically. Usually the external tube closing the magnetic field of the magnet is fixed, generating iron losses while the magnet is rotating. In applications where inertia is not critical, the tube and the magnet can rotate together, removing iron losses. See Figure 3. The BLDC motor falls into one of two categories, like the brushed motor ; the slotless and the slotted design.
The slotless design has the advantage of no cogging or detent torque, and to have less iron loss than a slotted design. Slotted design motors are typically employed in tough environments, as when the product requires autoclave sterilization. New high energy magnets are making slotless design the preference in small motors. The disadvantages of the traditional BLDC motor versus a DC ironless motor lie in its lower efficiency due to iron losses, and lower torque for the same size unit.
One way to compensate for the losses is to use the BLDC motor at higher speeds, taking into account this parameter when selecting a gearbox. There are several ways to drive the BLDC motor:. By definition, a stepper motor is a BLDC with many poles; thus, the current in each phase will have to be commuted many times per revolution. This design has the strong advantage of having many stable positions steps per revolution, providing a high torque for a given size versus regular BLDC or DC motor.
The disadvantage of a stepper is that it is not able to run at high speed, due to the inductance combined with the commutation frequency, and due to iron losses current reversed so many times. For battery applications, the Disc Magnet technology See Figure 4 i s best, as it carries lower inertia and iron losses than other steppers, resulting in higher efficiency.
For small portable pumps, stepper motors are the primary selection, if at low speed, they can be used in full step mode, and the detent torque is sufficient to hold the load. In this case, they are driven like a watch motor — the right quantity of energy is delivered to move one step to the next, while at stall position no current is applied in the phase. At high speeds, there are two options: either the motor has to run at high speed intermittently syringe change then driven as a regular stepper; or the motor needs to operate many times at high speed, increasing efficiency by closing the commutation loop like a regular servo motor thereby adding position feedback.
In some applications, a stepper solution with a gearbox may be the most economical design, since no encoder is required. In addition, at stall position no energy will be needed if the detent torque is strong enough to maintain the position. As mentioned earlier, a DC motor operating at high speed often requires a gearbox between the motor and the application.
Different styles of gearboxes are available, including types with planetary or spur gears, and units with belt drives. Gearboxes are defined for a given frame size by the output torque needed, the gear ratio and efficiency desired.
A spur gearbox has a better efficiency than a planetary gearbox for a given size and gear ratio, but a planetary system will be able to handle a stronger torque. The motor itself will present the highest efficiency at high speed, but higher speeds require a gearbox with a larger gear ratio.
The higher the gear ratio, lower the gearbox efficiency. The designer will have to select the best compromise between them. An encoder, important for closing the position loop, is defined by its resolution and its efficiency. Different options exist, such as optical, magnetic with hall sensor and magnetic with magneto-resistance. Today the trend is to use the latter, with the advantage of providing an extremely high resolution in a tiny package.
Dedicated ASICs used in such encoders are able to interpolate two sine-shaped signals in quadrature. Again, the design engineer will have to make sure the resolution and efficiency are correct. No universal technology solves all applications, but for each situation, there are some solutions with various advantages and disadvantages. To optimize a solution with specific criteria requires much expertise and access to different technologies.
Thus, during the design phase, project engineers should work closely with mechanical specialists, motor experts and electronic designers in order to take into account the entire system and not just a part of it.
Available Portescap solutions: For the DC products, we can suggest our new DC motor family using the high energy neodymium magnet technology and outstanding brush commutation. For applications such as portable infusion pumps that are constrained for space, our recommendation would be the 08G 8mm frame size brush DC series.
They are noiseless, highly efficient, thus give long life for battery run applications. Portescap continues the innovation for such applications through its dedicated product development effort in platform projects such as high power density coreless brush DC motors in the size range of 12 thru 22 mm and improved commutation longer life motors in the 8mm frame size. This revolutionary flat brushless DC motor has a very high efficiency and is ideal for space limited applications such as pumps and respirators.
Portescap can also offer a third solution: The TurboDisc technology. The first strength of this technology is the quick acceleration in open loop thanks to the high torque constant and low rotor inertia. The second advantage of this family is the high step resolution, compared to other stepper technologies. The TurboDisc is well suited for microstepping, allowing further increases in step resolution. The third advantage lies in the high speed capability, able to reach speeds up to 10, RPM.
Considering medical pumps, Portescap recommends the P and P, 10 and 16 mm size. For high torque applications, Portescap has developed a special gearbox family that can be adapted to its entire product panel. At that point, we would suggest the new R08, the R16 planetary gearboxes and the B16 spur gearbox dedicated for medical solutions. In addition to that, for incremental positioning applications, those motors can be driven in close loop with the new Portescap MR Encoder available in size 12 through 22 mm for coreless Brush DC motors and can reach lines per revolution.
The new Portescap MR2 encoders provide better accuracy and higher line counts than standard encoders available in the market place. Due to the ease of integration these encoders aid in reducing the size of the motor-encoder package while rendering high resolution and accuracy.
Yes, please keep me updated. Brushless DC Motors. Miniature Servo Motors for Medical Devices. Ultra EC Motors.
Surgical Motor Solutions. Brush DC Motors. All DC Motors. Athlonix Motors. Stepper Motors. Can Stack Motors.
Sigma-7 Servo Products
DC Coreless motors, as the name suggests, have no iron core in the rotor. Instead, a copper wire winding in a basket configuration coil rotates around the outside of a cylindrical magnet. Three major features of coreless motors are as follows:. Coreless moving coil is light weight, superior in quick starting and stopping high speed response.
DC Coreless Motors
DC servomotor NC Series permanent magnet coreless miniature. Add to favorites. Compare this product. Description The coreless DC motor is a highly responsive motor with a hollow structure that greatly reduces inertia. Low vibration, low noise, and smooth rotation can be obtained even at low speeds without cogging, and highly accurate control is possible. Since the coil inductance is small and the rectifying action is good, the life of the brush and commutator is long, and the generation of noise is suppressed. It is used in cancer treatment machine and nail art hand piece applications.
Dualsky Servos
Size - The servo mounting dimensions will determine the size of the servo that you choose. Also note that some have different depths, which can cause issues in models with limited mounting space. Torque - What is the size and weight of your model? In general, the bigger and heavier the model, the higher torque your servo should provide. Airplane control surface area and servo arm length are also factors.
Brushless Motors: What’s the Big Difference?
Dynetics distributes Canon Precision, Topband and E-Drive System with production facilities in Japan and China produce ironless core DC motors using neodymium magnets for high efficiency, low power consumption, low mechanical time-constant and quick response. In the past ten years E-Drive System develop ,manufacture ,and market reliable ,high-quality motors and offer value-added professional services to customers around the world. Currently, E-Dive offers five series diameter 16mm,20mm,22mm,26mm,28mm,35mm and 36mm ,13 types ,,,,,,,,,,, and of products with over hunderds specifications. Most of standard motors are listed in this brochure but many custom made designs have been excluded. We design motors to our customers' special needs because we base our success on our customers achieving their goals. E-Drive coreless motor commutators utilize a one-step injection molding process for precious metal or graphite commutation.
Which type of motor is better for disposable surgical power tools?
You save 6. We are importing and selling a diverse range of servo motors from various manufacturers for a long time and with tolerable feedback on it, we have come to know the issues faced by our customers regarding quality and efficiency. Owing to the responses of them we compelled to find the servo motor having good quality not only from outside but also from inner gear construction. So here we are launching our Own Orange Premium Quality servo motor series with Metal gears construction where we can assure you that you will receive the best quality of motor that you are paying for with a 1-month of Robu. We got constructed and tested this Orange Premium Servo with Steel gear material inside gears and a tight sturdy plastic case which makes them water and dust resistant which is a very must feature required in Boats, and RC Monster Trucks, etc. It equips a 3-wire JR servo plug which is compatible with Futaba connectors too. It rotates approximately degree, 60 degrees in each direction.
What are coreless DC motors?
Are you considering a brushless motor for your application? If so, then read on for an explanation of what we mean by these terms and help with choosing the right type. The difference between brushed DC and brushless DC technology is surprise!
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A servo simply plugs into a specific receiver, gyro, or FBL controller channel and is used to move that specific part of the RC model. As pictured above, most servos have the same 10 basic parts. There are of course variations on this basic layout, but this is typical of what you'll find:. Each of these components will be covered in more detail throughout this article, but let's start with 8, the servo plug One wire supplies positive DC voltage to the servo — usually 5 to 6 volts HV servos can handle up to 8. The second wire is for servo voltage ground, and the third wire is the servo signal wire. You will always find the center wire and center pin of the servo plug is the positive.
A typical brushed DC motor consists of an outer stator, typically made of either a permanent magnet or electromagnetic windings, and an inner rotor made of iron laminations with coil windings. A segmented commutator and brushes control the sequence in which the rotor windings are energized, to produce continuous rotation. Coreless DC motors do away with the laminated iron core in the rotor. The stator is made of a rare earth magnets, such as Neodymium, AlNiCo aluminum-nickel-cobalt , or SmCo samarium-cobalt , and sits inside the coreless rotor.
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