The name of CyTec is in recent years with the torque motor double pendulum entering the Chinese market. CyTec uses its unique torque motor to directly drive patented technology and external rotor torque motor technology. This is only 200 people in Germany. The small company, the machine tool industry deeply remembered his name, and also let the industrial giants of the electric motor industry plant a deep fight. In addition to the double-swing head CyTec's products also include a series of torque motor turntables, the basic knowledge of torque motors
Torque Motor, also translated as a torque motor, is essentially a low-speed, high-torque servo motor. It is classified into DC, brushless DC, and sinusoidal AC. The torque motor has a large number of poles, so the speed is generally only one hundred to several hundred revolutions. The following is a comparison between the CyTec torque motor and the ordinary servo motor parameters (see Table 1).
Table 1
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It can be seen from the above parameters that the rated current of the torque motor is very small, and the structure of the torque motor with a large torque can be driven by a small servo module, which is composed of an outer rotor and an inner rotor; the inner rotor structure has obvious advantages. Because the motor of the same torque can be smaller, in the machine tool industry, the same performance, small size has a big advantage CyTec uses the outer rotor structure (see Figure 1).
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Figure 1 Tortor motor of CyTec outer rotor mechanism |
Second, the torque motor direct drive is the best choice for high-speed and high-precision rotary motion rotary motion on the machine, such as the oscillating head and turntable (see Figure 2 and Figure 3), the traditional solution is to use servo motor + worm gear or gear Realization, the shortcomings of this method are also obvious: first of all, wear and wear of mechanical parts for long-term continuous operation is inevitable, especially the durability of the worm gear turret is a big problem, the precision retention is very poor; the second is the speed With low acceleration, when machining high-speed surfaces, if the speed of the rotating shaft is lower than the acceleration of the curved surface, overcutting will occur.
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| Figure 2 Torque motor directly driven swing head | Figure 3 Two-axis turntable with torque motor |
The rotor of the torque motor directly drives the movement of the rotating part. It has no intermediate transmission link. It is a non-contact transmission with no backlash and no wear. With high-precision encoder, encoder-level accuracy can be achieved. Torque motor Generally, a rotational speed of 60 r/min can be achieved, which is already a very high speed for the swinging mechanism.
Comparison of torque motors with gears and worm gears with ±2.5†encoder feedback (see Table 2):
Table 2
Torque motor Worm gear Gear positioning accuracy ±3†±10†±7â€
Speed ​​360°/s 60°/s 120°/s
Acceleration 1300°/s2 300°/s2 400°/s2
Accuracy of precision retention accuracy Accuracy of wear and tear is good. Swing torque is small, medium and large. The application of torque motor uses machine components of torque motor, mainly swing head and turntable. Figure 4 shows the typical structure of these two products. .
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Figure 4
CyTec's products are mainly used in China for five-axis gantry milling heads, horizontal center turning tables, gear grinding machines, blade grinding machine swing shafts, curved grinding head head frames, and universal grinding wheel wheel frame indexing (see Figure 5 and Figure 6).
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| Figure 5 5-axis gantry milling with torque motor oscillating head | Figure 6 Blade Grinding Machine with Double Axis Torque Motor Turntable |
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Figure 7 Horizontal machining center turntable | Figure 8 floor boring machine |
Fourth, the development and application of torque motors The torque motor is a mature product abroad, and the country is still in its infancy. The products using torque motors are not currently used in China, and the price is the biggest constraint. Secondly, some system parameters are not open. The best way to reduce prices is to increase production; at present, several companies in China are committed to the production of torque motors, which will force foreign products to cut prices, thus promoting the consumer market.
The development and production system of foreign products can be used for reference. For example, CyTec cooperates with Achen University to set up a special torque motor research institute to directly inject technology into production, and the company returns profits to research institutions for further research. The reason why CyTec can compete with some big companies is mainly due to the technical background of Achen University.
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