Tamagawa Tamagawa China Distributor Shenzhen AIT Automation Equipment Co., Ltd. is responsible for the sales and marketing of Tamagawa Tamagawa products in China. The main products include encoders, stepper motors, servo motors, electronic cams, speed sensors, resolvers, trackballs and other high-precision positioning detection elements. Products are widely used in aerospace, robotics, underwater facilities, elevators, textiles, semiconductors, packaging machinery, handling machinery and factory automation and other industries. Ayte has a full range of business activities including R&D, manufacturing, sales, and engineering services throughout the country. It has three wholly-owned subsidiaries in Shanghai, Ningbo, and Beijing, as well as sales and service networks in major cities across the country. To learn more about Ayte, please visit:
The Tamagawa rotary transformer, referred to as a resolver, is a signal component whose output voltage varies with the rotation angle of the rotor. When the excitation winding is excited with an AC voltage of a certain frequency, the voltage amplitude of the output winding is in a sine and cosine function relationship with the rotor rotation angle, or maintains a proportional relationship, or a linear relationship with the rotation angle within a certain range of rotation angle. It is mainly used for coordinate transformation, trigonometric calculation and angle data transmission, and also can be used as a two-phase phase shifter in an angle-to-digital conversion device.
Tamagawa Tamagawa Resolver Structure Japan Tamagawa is a professional manufacturer of encoders. In addition to optical encoders, rotary transformers are also its main products. Its rotary transformer has split type and integrated type two kinds.
Since our company only sells sinusoidal resolvers from Japan's Tamagawa, the resolvers introduced here are all sine-cosine.
Rotation is composed of rotor and stator windings, and the two are independent of each other. The primary and secondary coils are wound on the stator. The rotor is composed of two sets of 90° coils. The brushless design separates the rotor from the stator. As shown in Figure 1.
Fig. 2 is a syntagesyn that is specially used in hybrid vehicles. Its rotor is made of silicon steel sheet, so it has a high degree of protection, has high temperature resistance, shock resistance and other characteristics, and is more suitable for use in harsh environments. The rotor and stator separation design is adopted in the structure, which is easy to install and easy to maintain.
Figure 1 Internal structure of a resolver
Figure 2 (Tamagawa) syngelesyn resolver outline drawing
Figure 3 Outline drawing of Tamagawa integrated rotary transformer
Fig. 3 is a one-piece type resolver, which is the same as the split type, but the structure has been integrated design, so the installation is very simple and electromagnetic shielding function, so it is widely used in elevators, CNC and other industries.
Resolver decoding
Figure 4 is an electrical schematic of a resolver.
Figure 4 working principle diagram of a resolver
The specific functional relationship between the resolving input and output voltages is as follows:
Let the rotation angle of the rotor be θ, the primary coil voltage (that is, the excitation voltage): r1-r2=esin2πft
f excitation frequency, e: signal amplitude then output voltage es1-s3=kesin2πftcosθ; es2-s4=kesin2πftsinθ
k: transmission ratio, θ: the angle of the rotor from the origin makes θ=ωt, ie, the rotor performs a uniform motion, then the function curve of its output signal can be represented as shown in FIG. 5.
Figure 5 Output waveform of resolver
In FIG. 5, the signal frequency is f, that is, the excitation signal frequency, the maximum amplitude is e, and the envelope signals are sin ωt and cos ωt. The decoder obtains the position information of the resolver by detecting the two sets of output signals.
It is not difficult to see that the higher the excitation frequency, the higher the resolver decoding accuracy, and the excitation voltage amplitude has no significant effect on the decoding. Only need to reach a certain voltage value, generally 3v ~ 1.2 times the rated voltage can meet the decoding needs.
Tamagawa decoding chip Tamagawa Japan Tamagawa introduced its own variety of decoding chip, the principle is basically the same, as shown in Figure 6: decoder chip block diagram if in Figure 6 vsr = 0, then θm = θrd, you can decode out Rotor angle.
Figure 6 Tamagawa decoder chip schematic
Decoder chip output methods include incremental output and absolute output. In incremental output, the resolution is 1024c/t (c: pulse number, t: one cycle), and the absolute output output number is 12 bits. And it can output the direction signal and the error signal, the peripheral circuit is simple, only a few components can complete the decoding work.
Japan’s Tamagawa Corporation has introduced several decoding chips called smartcoder, including au6802, au6802n1, and the most recent au6803. In addition, the rotation cam and Tamagawa's smartcam can simulate the motion control of the mechanical cam and can be used to replace the rough and bulky mechanical cam. Become an efficient and cheap control tool in industrial control.
Decoder board For Tamagawa revolving, our company has developed a decoder board (the so-called r/d converter board) that can simultaneously decode incremental signals and absolute signals. In conjunction with resolver, it can be used in the same frequency conversion as the use of encoders. Used in the sevo system, its performance characteristics are as follows:
Conversion accuracy: 11arc s;
Allowed maximum speed: 60000r/min;
Accuracy: Incremental 1024c/t, using long line output;
Jedi-type output: 12 bits, output using optocoupler;
Supply voltage: +5v±5%;
Direction signal, alarm signal output.
Welcome to inquire or negotiate. As for the specific decoding circuit, it is not introduced here. Readers can search for chip data and related application circuits on related websites. If in doubt, they can also directly call our company for telephone consultation.
Characteristics Because of the structural characteristics of the resolver itself, it has the ability to withstand harsh environments. The specific parameters are as follows:
Temperature range: -55°C～155°C;
Vibration: 196m/s2(20g)10～500hz;
Impact: 981 m/s2 (100g) 10ms;
Humidity: 90% rh min. at60°C;
Speed: 100～500r/s.
In addition, the rotary transformer adopts the brushless design, so the maintenance is convenient, the use is reliable, the service life is long, and it is insensitive to mechanical and electrical noise.
Due to the above characteristics of revolving, it is widely used in military equipment such as aviation, aerospace, radar, tanks and ground fire control. It can also be used in civil sevo control systems and robot systems such as CNC machine tools and robots, mechanical tools, automobiles, electric power, and metallurgy. , textiles, printing and other fields.
In the servo system, it is often required to detect the position of the rotor of the motor in real time and also to detect the speed of the motor so as to achieve high-precision control of the motor torque, speed, and the position of the drive mechanism. In the detection of the motor rotor position, the resolver decoder can provide high-precision position information, and the user can obtain the speed information directly from the decoder without even calculating, and thus obtain more and more extensive applications.
In the textile industry, due to environmental factors, it is easy to generate severe static electricity, and common encoders are easily damaged in such environments. The rotary transformer has strong resistance to static electricity due to its own structural characteristics. So if you use a resolver you can solve this problem.
In addition, rotary transformers are widely used in place of encoders in other industries. For example, it can be used in metallurgy, water conservancy and hydropower, automation equipment, printing, elevators, etc.
Specific application methods, if you are interested readers, welcome to inquire! (Tamagawa) Tamagawa China Distributor Shenzhen Ai Te Industrial Automation Equipment Co., Ltd. look forward to your visit to the Chinese General: