Super Power -- AXI Gold Line Double 5330/20 Outrunner

Special power unit based on two AXI 5330 motors was custom designed for aerobatic models of planes up to 16000g. Maximum burst power of this unit reach 6000Watts. DOUBLE AXI 5330/20 GOLD LINE is suitable for use with single propeller but is also ready for two contra rotating props.



Electric motors manufactured by Modelmotors are marked with name and numbers with slash. Name means type of motor (eg.: AXI - brushless 14-pole outrunner, MiniAC - brushless two-pole inrunner). First two numbers mean diameter of stator and next two numbers lenght of stator in mm. Simplified the bigger diameter and lenght the bigger power of motor. The number behind the slash is winding number. The lower winding number the higher RPM and current capacity.

•No. of cells: 10s Li-Poly
•RPM/V: 235 •Max. efficiency: 91%
•Max. efficiency current: 23 - 57A (>85%)
•Current capacity: 75A / 20s
•No load current: 1.8A - 3A
•Internal Resistance: 2 x 45m ohm
•Dimensions (Diameter x Length): 63 x 159mm
•Shaft diameter: 8mm / 32mm
•Weight with cables: 1150g

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Review on AXI Motor (Gold Line 2217/9D )

I shared some information of axi motor before.

Today, i want to discuss AXI Gold Line 2217/9D Outrunner Brushless Motor .

I brought this motor on rcecho.com last weekend.




The high quality and performance of AXI 22xx GOLD LINE motors meant that they were a perfect base for development of the new AXI 2217/xx GOLD LINE. New small and powerfull motor AXI 2217/9D GOLD LINE with rotating case is suitable for aerobatic models up to 800g and for microhelicopters up to 700g. Hardened steel Shaft have 3,17mm diameter and is supported by two large ball bearings wich ensure very good mechanical stability. Thanks to using newest materials this motors achieve in their weight category extremely high efficiency and high load possibility. The optional Radial Mount Sets can be use also with AXI 2217/xx series motors.

Motor Nomenclature
Electric motors manufactured by Modelmotors are marked with name and numbers with slash. Name means type of motor (eg.: AXI - brushless 14-pole outrunner, MiniAC - brushless two-pole inrunner). First two numbers mean diameter of stator and next two numbers lenght of stator in mm. Simplified the bigger diameter and lenght the bigger power of motor. The number behind the slash is winding number. The lower winding number the higher RPM and current capacity.

Motor Specifications

No. of cells: 2 - 3 Li-Poly

RPM/V: 1880

Max. efficiency: 84%

Max. efficiency current: 17 - 30A (>75%)

Current capacity: 34A / 30s

No load current: 1.9A

Internal Resistance: 39m ohm

Dimensions (Diameter x Length): 27.7 x 35mm

Shaft diameter: 3.17mm

Weight with cables: 69.5g

This motor has high quality . It is suitable for my helicopter.^^

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How does Timing effect the power of an electric motor?

In general terms this describes motor action:-) But (bet you knew that was coming) more specifically you need to first visualize that the permanent magnets create a fixed field in magnitude and position (for this discussion). This field has a shape with a maximum intensity exactly between the magnets (in a 2 pole motor - most DC motors - directly opposite each other). To generate the maximum torque from the motor, the electric field generated by applying current to the windings must be located 90 ELECTRICAL degrees from the center of the magnet field (90 physical deg. in a 2 pole motor). This is defined as the max. Kt (torque constant - oz.in./A)


What happens in a real motor under load is that the electric field lags the magnet field due to inductance effects in the windings and possibly some saturation effects in the steel parts (magnetic iron). The amount of lag varies with load (and rpm), so is a complex variable.


We try to preset the motor timing (brush position) so that at a selected load current, the fields are at the 90 E deg point for max. Kt., and max. magnetic power conversion efficiency. At no-load (without a prop) this will be an advanced position and since it is ahead of the 90 E Deg. point, will have a reduced Kt (take the SIN of the angle x KT90, eg SIN108 x 1 = .951 x Kt), which requires more current to turn the shaft (at no-load. The current will pull into phase at the selected load current. This will actually look like the current decreasing as the load increases, up to a point.


In a brushless motor the same thing is happening, but we advance the hall sensors for this effect. The big difference is that we have to visualize the analogy while sitting on the rotor (stationary frame of reference) and look at the stator field.


This is explained in most texts of ac and dc electric machines. It's a lot more complex than this, so I hope I've given you some insight as to the goings on in that little bundle of wire and magnets.

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Difference between brushed and brushless motors .

Today, i am going to talk about motor.
RC motor can be divide into two classifications, brushed motor and brushless motor.
Today, i will tell you the difference between brushed and brushless motors .


Brushed vs. Brushless
RC MotorsTo fully appreciate the advantages of a brushless RC motor, you need to have a basic understand of how motors work.

"How Stuff Works” has an in depth explanation of how motors work, and the graphics in the section were taken from that article. Below is a quick summary of how a canned motor works.

Standard "canned" Motor
A standard brushed motor is often referred as a canned motor. Every canned motor consists of the following parts:

Armature
The rotating portion of the motor. It consists of the poles, terminals, and the commutator.

Poles
Copper wires wound around a piece of metal forming an electromagnet. The poles are attached to the armature. Most motors have 3 or more poles

Terminal
Point at which the copper wire of a poll attaches.

Commutator
A switch on the armature that reverses the current to the poles every 1/2 rotation so that the magnetic fields of each will always maintain rotation.

Brushes
Tabs in the motor cap that are wired to the battery and make contact with the plates on the commutator as the armature rotates.

Magnets
The outer shell (or can) of the motor is lined with two permanent magnets, of opposite polarity. This non-rotating portion of the motor is also referred as the motor stator.

The battery is wired directly to the brushes. The brushes make contact with the plates of the commutator as the motor turns. There are the same number of plates on the commutator as there are poles on the armature.

When the brushes come in contact with the appropriate plates of the commutator, a particular pole (electromagnet) is charged. When a pole is charged, it is attracted to one of the magnets in the can and repelled by the other.

The commutator acts as a switch by switching the polarity of each pole every time the pole passes a magnet. When the polarity is switched, the pole is attracted to the next magnet in the can while being repelled by the one it just passed. This process repeats as long as power is supplied to the motor.





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Do you know AXI this band?

Today, I received my AXI Gold Line 4120/14 Outrunner Brushless Motor which I buy from www.rcecho.com in last week~HAHA ~~^^

Do you know Axi this band? If you don’t know what is AXI motor, there are some information about AXI motor.Axi have high quality.

AXI RC motors are a special brand of RC motors that have been designed by Model Motors Ltd. A company that specializes in building motors and their parts for all types of RC models. AXI RC motors are high quality motors that produce a large amount of output despite their tiny sizes. If you are looking to build your RC model from scratch and are looking for a reliable and powerful power station, then you definitely need to consider an AXI RC motor for your project.

AXI motors were first developed in 2001. The first model, The AXI 2820/10, was a brushless motor with an outer rotating case. The outer case became known as the ?Outrunner?, a word derived from the German word ?Aussenlaeufer?. The motor soon became one of the topmost selling models in the world and was considered to be one of the best performance motors in the market. Today, the company produces motors for all types of RC airplanes, boats and cars.
If you are looking for the best RC motor for your model, then you need to look for one made with the latest materials and technology. The ideal motor offers you high efficiency despite varying loads that need to be propelled. AXI RC motors are renowned for their ability to pull even heavy RC models at high speeds without compromising on the efficiency.

Due to the high torque generation of the Outrunner, the brushless AXI RC motor can generate a great amount of thrust despite its smaller size. While on direct drive, AXI RC motors can drive large diameter propellers as well as high pitch propellers with extremely high levels of efficiency, something that ensures that you do not lose out on power or performance due to your RC model's large size or weight.

If you are looking to run your RC model at higher than normal current levels, while extracting a high weight-to-power ratio, then you need to look at the line of products offered in the AXI RC motor range. These motors are manufactured with pin-point precision and are extremely reliable for all RC models.

Whether you are a first-time builder or an experienced hobbyist, you should look at the prospect of harnessing a strong and powerful motor that offers you the latest technology and the highest levels of performance and AXI RC motors fit the bill.

I will test my new motor in next few days. When I tried it, I will share my option to u~~

www.rcecho.com

Choosing the Right Brushless Electric Motor for Your RC Airplane

Today i wnat to teach you ho to choose a Right Brushless Electric Motor for your RC Airplane

Finding the brushless motor that is the best choice for your plane or helicopter can seem to be a daunting task due to the large number that are available. There are a few important considerations you should keep in mind when choosing. This article will help you identify these issues so you can spend more time flying and less time trying to find that “perfect” motor.

Ultimately, you want to swing a certain size prop at a certain RPM. In fact, the freedom you have in choosing propeller size and operating RPM can lead to huge performance gains over comparable glow motors used in many remote control airplanes. Prop and RPM selection determines how much power you need, it is important to choose a motor that is almost at its limits when running at that power level. A motor that is too small will overheat and ruin itself, a motor that is too large will be a detriment to performance, due to the added weight.

Translating propellor size and RPM into power requires some help. This help can come from a computer-based prop simulator. You can also find data posted by someone who has done what you are trying to do; find out what prop they used, what RPM it spun, and how much power was used.

Your list of potential motors should now only contain motors that can comfortably (but not ‘in their sleep’) put out the power you need. Now you’ll have to make decisions on the other things: battery voltage and capacity, direct drive or geared, outrunner or inrunner, and kV.

The easiest choice is whether to use direct drive or a gear box, so make that one first. If you want to turn high RPM (greater than 10,000 RPM) you’ll probably want a direct drive inrunner. For lower RPM, you can run an outrunner in direct drive or an inrunner through a gearbox. The outrunner motor is simpler and quieter, but the inrunner motor in a gearbox can be more adjustable and slightly more efficient. In some cases, the outrunner motor can be quite a bit cheaper. Each has its advantages, so consider them both.

At this point you know what RPM your motor needs to turn. It is either the same as you want the prop to turn(direct drive), or at a ratio faster than the prop when using a gearbox. Motor RPM is going to determine your specific motor and battery choice, by the following approximate formula (assuming lithium polymer batteries).

Motor RPM = 0.8 x 3.5V x Series Cell Count x Motor kV Rating

You need to select the right motor and battery combination that will satisfy the motor RPM formula. You can do it with a low kV motor and a high series cell count battery, or vice versa.

Lithium polymer battery packs are ideal for use with brushless motors in radio controlled airplanes and helicopters due to their low weight and high capacity compared to NiMH and NiCd packs. Along with a brushless motor and battery, you will also need a brushless speed control (ESC) with an amp rating equal to or greater than the peak current drawn by your motor.

Make your choice, order the parts, put them together.You want to make sure that you are near the RPM and power levels you were aiming for. Remember, though, the most important test is how it performs in the air. Fly it, and fine tune with prop selection. Hopefully this article has brought you close enough that a motor or battery change isn’t required.

Hope this information can help u~
in the last month , i brought a AXI Gold Line 4120/18 Outrunner Brushless Motor from rcecho.com.
It is very suitable for my helicopter. And it is powerful~~

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