Wednesday, August 31, 2011

BLDC motor classification by purpose

bldc motor classification by purpose

bldc motor-use classification: bldc motor controller and bldc motor driver. bldc motor drive with divided: power tools (including drilling, polishing, grinding, grooving, cutting, reaming and other tools) with bldc motor, household appliances (including washing machines, electric fans, refrigerators, air conditioners, tape recorders, video recorders , DVD players, vacuum cleaners, cameras, hair dryers, electric razors, etc.) with bldc motor and other general-purpose small mechanical equipment (including a variety of small tools, small machinery, medical equipment, electronic equipment, etc.) with bldc motor.
 Controlling bldc motor can be divided into: Stepping bldc motor and servo bldc motor and so on. 

Wednesday, August 24, 2011

Non-motor vehicle bike conversion kit

SHENZHEN, June 7 (Xinhua reporter Wu dream up) 6, Shenzhen formally implemented in the main urban electric bike conversion on the road against the policy. Reporters under Part 6 in Shenzhen, the forbidden line region did not find driving electric bike conversion.
According to the Shenzhen Municipal Public Security Bureau on May 26 issued a "ban on roads in some areas of electric bike conversion kit installed in power plants and other non-motor vehicle a notice," from June 6 to December 5, Shenzhen prohibited from entering the electric bike conversion kit Futian, Luohu and Yantian, Nanshan, Baoan and other major urban areas.
Traffic police department said the traffic police department before July 1 electric vehicle found in violation will be advised based, on July 1 will officially start penalties on illegal riding will be $ 200, will be temporarily detained vehicles such as refuse to pay a fine.
Previously, Shenzhen Traffic Police Bureau official said, and electric vehicle-related accidents are more impact on road safety and traffic efficiency is the main reason for the forbidden line of electric vehicles. According to statistics, in 2010, Shenzhen traffic accidents involving electric vehicles 268, resulting in 64 deaths.
Some analysts believe that, due to electric bike kit is the express delivery company in the end the main means of transport used to restrict the electric car will greatly enhance the delivery of Shenzhen logistics enterprises and part of the self-built e-commerce businesses operating costs. Electric bike kit in Shenzhen City, amounted to more than 50 million units to maintain.

Saturday, August 20, 2011

Background and Structure of Brushless Motor


In recent years, brushless motor as the rapid development of the field in the model as a driving force. As the output and price reasons, the past few years, brushless motor to use more air in the high-end model, since the rapid development of machining technology, brushless motor production costs of many, and it is currently entering the field at all levels of the model, From electric cars to electric remote control boat remote control to the electric model airplanes, everywhere.
Misunderstanding of the brushless motor
Many people have seen the model with brushless hub motor, they are used in battery-powered, so a lot of people in knowledge, there have been such a misunderstanding, that the brushless motor is a DC motor, it is not true, brushless motors are AC motors , is a three-phase AC permanent magnet motor, brushless motor 3 input model conductor current is AC, but this is not 50HZ AC mains sine wave, but from the brushless motor controller (commonly known as brushless ESC) out of the three-phase modulation becomes rectangular wave frequency is much higher than 50HZ, and with the motor speed change.
Brushless Motor Structural Analysis
Structure, brushless motors and brush motors are similar, there are rotor and stator, but the structure of the brush motor and the opposite; brush motor switch is the coil windings, and power output shaft is connected to the stator is a permanent magnet steel; brushless permanent magnet motor rotor is, together with housing and output shaft connected to the stator windings is to remove the brush motor is used to alternate the electric field for the brush, so called brushless motor (Brushless motor), I now have a problem, not the electromagnetic field of transformation, how to make brushless motor it?

Wednesday, August 17, 2011

ordinary electric bike conversion

With the development of society, the progress of time, for the convenience of modern life and the pursuit of the growing green fashion, personalization, means of transport the bicycle to motorcycle to car change more rapidly. However, the popular means of transport for bicycles and motorcycles by the limitations of the great challenges from electric tricycle, convenient, safe and comfortable, low energy consumption, pollution-free, low-cost, efficient, practical and stylish electric tricycle gradually changed the way people way of life. According to industry statistics, the domestic market demand for electric cars 80% of the annual rate of growth. Experts pointed out that the "electric tricycle with small size, low price and convenient, fast, comfortable, etc., in use does not produce exhaust pollution, spent around $ 1500 can buy the means of transport, that is stylish and practical." purchase and use of electric tricycle will become a new consumption trend.

However, the current 1,500 yuan on the market for the vast number of electric tricycle low-income are that 450 million bicycle owners, want to have a fashion personality electric tricycle is still elusive, love "black" is can not and "House"! Therefore, the cost of an ordinary electric bike conversion of the successful launch, no doubt to meet the public demand for cyclists, and also for the investors in this project a huge market opportunity.

Leafmotor bicycle conversion electric car based on this distribution center is a huge potential market-oriented, launched a low-cost ordinary electric bike conversion project. Modification or renovation of the old bike a new bike directly into a fashion personality to install electric tricycle, only to spend several hundred dollars, enough to satisfy the public demand for cyclists, ordinary people achieve the dream of fashion.
The center will be based in good faith, the supremacy of the principle of reciprocity, "quality win, reputation-based", we sincerely welcome customers to visit us.

Sunday, August 14, 2011

DC-DC converter is the core of Brushless motor

DC-DC converter is the core of Brushless motor


220V AC voltage is rectified and filtered DC voltage to be 320V or so, add to the power module input. Single DC-DC module maximum output voltage is generally +48 V, +60 V DC to get the output voltage, the method must be used module in series. Design uses two PH600S280-28 DC-DC module (to +30 V output) through the series to get +60 V output voltage, fast recovery diodes D1, D2 is the protection devices in series, requiring D1, D2 reverse voltage greater than twice the rated output voltage power supply, power supply rated current greater than twice the output current, the forward voltage drop should be as small as possible. Because it is in series with two power supply module power supply system, in a limited package to complete the design will be difficult, and some program using two modules in series to complete the design package, namely the design of two separate 30V power supply, then an external series constitute the +60 V power supply system. Design through the rational allocation of space, power up and down in the lid of each installation of a DC-DC module to heat the metal shell as a means of compact design and installation of technology to the entire power system packaged in a smaller space, so that the whole power supply size, weight greatly reduced cross-sectional area of ​​only 6 × 9 inch 2, to achieve a small size high-power integrated power system design.

Leafmotor announced launch of brushless motor evaluation kit

Media_httpwwwleafmoto_bjzni

Leafmotor announced the launch of a new generation for the brushless motor series evaluation kit (DRV8412-C2-KIT). The kit contains two brushless dc motor which can be started directly or single department all the necessary hardware software of stepper motor.

Out of the box with the brushless motor controller and driver solution containing DRV8412 motor drives, real-time control C2000 ™ Piccolo ™ microcontroller (MCU), controlCARD module, Quick Start GUI, comprehensive development of the source code, Code Composer Studio ™ (CCStudio) integrated development environment (IDE) and a variety of motors;

Friday, August 12, 2011

Brushless motor drive circuit

Brushless motor drive circuit, if the distributor in accordance with the decision of the distribution ring, to control the motor windings of each phase is turned on or off, so that the motor steps required to drag the rotor magnetic potential of rotation rotation step, the step angle is only two, that the whole or half-step work work, step angle motor structure has been determined. If the request brushless motor with a smaller step angle, higher resolution, or to motor vibration, noise and other reasons, you can switch each input pulse, the only change in the nominal winding corresponding part of the motor synthetic Ci potential step angle rotation only part of the rotor to run each step, only part of the step angle. Here, the winding current is not a square wave, but the step-wave, current rating is the step-input or the removal of the current into the number of steps, the rotor turned on with the same number of times a step away from the corner, this would be a step subdivided into a number of step angle driving method, known as the sub driver. In other countries, for the step system, mainly two-phase hybrid brushless motor and the corresponding sub-driver. However, at home, the majority of users of "niche" is not particularly aware of, but rather that the subdivision is to increase the accuracy, is not the case, mainly to improve the electrical breakdown of the operating performance. As the sub-drive to accurately control the motor phase current, so the drive must have very high technical requirements and process requirements, the cost will be higher.

In order to brushless motor phase current control to achieve the sub-brushless motor step angle of the goal, it was designed for a very wide range of brushless motor drive circuit segments. With the development of micro-computer, especially the emergence of single-chip computer, the breakdown for the brushless motor drive is made easier. Currently, brushless motor drive circuit segments are single-chip computer control of most, they constitute a block diagram shown in Figure 4. Microcontroller according to the requirements of step angle calculated for each phase winding by the current value, and output to digital to analog converter (DPA), by the DPA to digital conversion to the corresponding analog voltage, applied through the phase ring distributor amplifier circuit, amplifier circuit to control each phase winding of the corresponding current to achieve brushless motor breakdown.

characteristics of three-phase brushless motor

Media_httpwwwleafmoto_jcjap

As a matter of fact, it is rather difficult for people to analyze the operation characteristics of three-phase brushless motor accurately. Motor air gap flux density distribution along with the air gap by sinusoidal. When the winding is energized, magnetic flux generated by the current impact of the air gap is negligible. In the condition of the switch operation, the power transistor is constant pressure drop. Each winding is symmetry and the corresponding circuit is completely consistent. The relevant electric time constant can be neglected. The power of sensored brushless motor and others that control circuit are also negligible. Three-phase brushless DC motors are also synchronous motors. It is very important to protect the three-phase brushless dc motor drivers.

Sports bike kits

Media_httpwwwleafmoto_mfobg

They have been designed consequentl as to handle the high speeds and even the feature of winding roads. They have the ability to offer more power with the help of the multi cylinder engines; hence they are capable of providing more power. The aluminum alloy frames and the stiff suspensions have the capability to improve handling, high grip tires and even they offer the powerful brakes.The sports bikes render the bikers to allow them to lean forward over the gas tank consequentl as to reduce the wind resistance. In the other bikes the people are made to sit straight unlike the sports bike kit wherein they rest on the gas tank. The experience on bikes is one of the most remarkable experiences it suits and caters to the needs of both the adults as well as kids. The choppers these days are one of the optimal consequentlught experiences thus attracting most of the crazy bikers. These days there are more number of people getting attracted towards the choppers and the bikes. These days there are motorcycles usable in different styles and design each of them offering with the perforgentlemance traitistics consequentl as to accommodate the specific riding conditions. This article will help you understand the different traitistics of the different categories of the bike kits.

characteristics of three-phase brushless motor

Media_httpwwwleafmoto_bckhs

As a matter of fact, it is rather difficult for people to analyze the operation characteristics of three-phase brushless motor accurately. Motor air gap flux density distribution along with the air gap by sinusoidal. When the winding is energized, magnetic flux generated by the current impact of the air gap is negligible. In the condition of the switch operation, the power transistor is constant pressure drop. Each winding is symmetry and the corresponding circuit is completely consistent. The relevant electric time constant can be neglected. The power of sensored brushless motor and others that control circuit are also negligible. Three-phase brushless DC motors are also synchronous motors. It is very important to protect the three-phase brushless dc motor drivers.

Tuesday, August 9, 2011

Basics of an Electric Hub Motor

There are two main types of electric bike motors, each with their own set of features and functions.

The hub motor:
• The motor is compact in size to fit into the wheel.
• Most hub motors provide great efficiency with relatively low noise.
• Many of the leading companies offer custom-made hub electric bike motors to fit the needs of the consumer.
• Initially, you have to set up the built-in programmer.
• The best models offer cruise control.
• The weight can range from 5-15kg, which is a lot.
• The power ranges from 250-1000 Watts depending on the hub motor regulations for the area.
• The price ranges from a $100 to as much as $500.
• It is extremely energy efficient with minimum loss of energy and the total cost of maintenance is surprisingly low.
• Generally, you have to modify the wheel to make room for the electric bike motor.

The brushless motor:
• The electric bike motor has electronic functioning.
• It is environmentally safe.
• The motor works with a DC current.
• Generally, a brushless motor has an integrated gearbox, which significantly increases the amount of motor torque.
• High speed cruising with this motor is a highly enjoyable experience.

If you intend on buying an e bike kit then it will come with one of these motors and probably a choice between wide ranges of power. E bike kits are easier to install for a first time user and a person with limited knowledge of machinery. However, if you want to construct an entire electric bike from scratch, then you should pay special attention to the electric bike motor specifications to select the kind that would fit your lifestyle.

Whether you are interested in purchasing an ebike or you’re looking into starting from scratch in order to create your very own customized electric bicycle, you will definitely need to know the basics of the electric bike motor.

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Monday, August 8, 2011

BLDC motor

Reluctance that the magnetic flux through the steel, air gap and magnet composed of magnetic circuit of the degree of difficulty. Magnetic flux is a very good source, the equivalent current source. Phase winding MMF is a good source, a voltage source. At low magnetic load, steel reluctance is small, and not in magnetic saturation. In high magnetic loading (typically> 1.5 T), the reluctance of steel will start with the rapid increase in magnetic saturation. Air has a very high reluctance, it has nothing to do with the magnetic load. Magnetic materials have similar characteristics.

Reluctance with the position change, so can be used as the basis of sensor operation. In all the BLDC motor, the reluctance of some changes will occur with the point of view. From the motor point of view, the reluctance of change and change in inductance as obvious. Reluctance variation has obvious advantages, because at zero speed can be detected. However, you need to know to control the motor L (i, θ) characteristics.

Unfortunately, for many BLDC motors, reluctance changes with location is too small, can not be reliably measured. Especially for surface mounting of the magnet motor, the large effective air gap, so this feature in this type of motor has been particularly evident. Therefore, the reluctance of the main part of the same, which makes the remaining changes occurred with the location is difficult to measure. In specially designed for low torque ripple of the motor, the reluctance changes will be small because of the reluctance change will produce extra torque. Magnetic or magnetic motor hidden inside the angle changes with great reluctance, but they are generally powered with sinusoidal voltage and therefore not be discussed here.

Motor BEMF waveform changes with position and velocity. It is not possible at zero speed and low speed with the BEMF detection position. However, there are many applications (such as fans and pumps) at low speed or position control loop does not need to run. For these applications, BEMF method is very suitable. There are many ways to use BEMF, the main method can be summarized as follows:
• The motor terminal voltage detection
- By direct measurement or estimated (state and DC bus voltage switching is known).
• midpoint voltage detection
- Applies only to special characteristics of Y-connection BEMF motor.
- Does not really need the first four lines. Using the resistor network and differential operation, you can re-establish the center of a star connection.
• bus current gradient detection
- Because of the change go hand in hand ahead of or behind the rotor change, bus current thus depends on the particular shape.
- Can not use the fast bus current control.

Saturday, August 6, 2011

bicycle with an electric bike conversion kit

If you currently travel everywhere by car you are sure to be spending a lot of your time stuck in traffic, searching for a parking place or filling up at the petrol station. For these reasons you might be interested in a different mode of travel. Electric bikes are an environmentally friendly mode of transportation and gaining in popularity due to the many benefits they offer. You don't even have to spend a large amount of money and purchase a brand new electric bike to benefit; it is possible to convert your current bicycle with an electric bike conversion kit. Whether it will be used for pedaling through the city centre at rush hour or cycling down the country roads for pleasure it could be the answer you have been looking for.

Riding an electric bicycle is a very sustainable mode of transportation, saving on gasoline and it burns lots of calories too! Basically it is just a perfect solution that saves time, money and provides you with a healthier lifestyle! There are lots of benefits to posses an electric bicycle. For one you don't need a license to drive or insurance as it is categorized as a push bike. To own an electric bike works out far cheaper than having a car or even a scooter.

Just what is an electric bike? Basically it is an everyday bicycle with a battery powered electric motor attached, recharged by plugging it into the electricity mains. It is very simple, once you start to pedal the motor kicks in, stop pedaling the motor cuts off; pedaling speeds of up to 25kmph can be reached with the aid of the motor. Electric bikes are perfect for those who want to keep or get fit, for short distance or city centre commuting, those who have no wish to drive and active older people.

Tuesday, August 2, 2011

hub motor and Pump motor

hub motor armature speed transfer of thousands, and are excited (or series wound) motor, the rotor and the stator has a coil, there are still large in the low speed torque. Pump motor is an asynchronous induction motor, the stator with coils only, of course, the rotor can also be seen as a coil, but not with copper wire, and not low speed, 1,400 rpm, a 4-pole motor.

hub motor is a generic type (string-excited) motors can be common in the AC and DC power to run.

Series wound AC motor and DC motor structure is no different, such as hair dryer, mill, hub motor, and so used the motor, but did not like the DC motor with permanent magnets to generate magnetic fields. A commutator, carbon brushes, work with electric spark generated noisy. AC induction motors in general no commutator, carbon brush, the input current from the stator windings.

1, hub motor is what kind of motor?

hub motor is a series wound motor, features a brush, working in a spark, noise; torque is larger, does not require phase-shifting capacitor.

2, with the structure of the DC series motors are identical, of course, is not the same coil winding.

3, series motor is the specified sub-coils and the rotor excitation coil is in series. This heavy motor load, the current increase, the excitation current is also large, strong magnetic field generated by the torque will also increase, so a larger starting torque.

4, as mentioned earlier, AC and DC current through the coil impedance varies greatly, 220V DC 220V AC motor with a large coil is not the same, can not be universal.

China's largest hub motor research and production base

Nanyang Explosion Protection Group Co., Ltd. is a national high-tech enterprise, China's largest hub motor research and production base, the state of electromechanical products export base, China Electrical Equipment Industrial Association, hub motor sub-unit director, post-doctoral workstation station unit, with state-level enterprise technical centers, production 0.01KW-63000KW various sizes high and low pressure explosion-proof \ normal motor and electric generator, light turbo, explosion-proof fans, explosion-proof electrical and control instrumentation for China's petrochemical, oil, coal, coal, chemical, electric power, metallurgy and other industries have made important contributions.

Nanyang Explosion Protection Group Co., Ltd. is the new General Electric's largest subsidiary of Nanyang Explosion Protection Group, one of the main production of small hub motor, explosion-proof fittings and derived on this basis, the explosion efficiency motors. About 40% of products exported to Europe, America, Australia and countries. Annual production capacity of 600,000 KW, output value of 120 million yuan. The company employees 420 people in the post, including 53 engineers and technicians. The company has complete production and testing of electrical testing equipment, relying on anti-South Group's strong technical support, use of anti-Group South advanced quality management system, can produce YB3, YB2, YA, YXN, YBXN, YBK2, YBP, YB2-H, YFB, YX2, YBFB, YAXN, YBJ, YBS, YBF, YP, YI motor series and a variety of special requirements, and export PPA, XPA, PPD, NEX, NEH, NEHE and other new high-efficiency motors are widely used in domestic outside the coal, petroleum, chemical, military and other industries.