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Tongda is committed to research and development and production of high-quality, low-cost, high-performance products to meet customer needs.
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We display the most commonly used products in the catalog: EMI electromagnetic shielding, transformer magnetic ring, filter circular magnetic ring and RF application magnetic ring.
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FS series magnetic core

RID double hole magnetic ring

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Each product has undergone rigorous professional testing, and its performance is guaranteed to ensure that it can prevent virtual signals from sensors and emitters and suppress RF signals.
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From retrace transformers, high-energy transformers, inductive devices, filters, vibrators, oscillating chokes, computer connectors to electronic connectors, Tongda's production line can meet the needs of any magnetic core professional application.
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10-20 

What kind of strong magnet is of good quality?

At present, the sales competition of powerful magnets in the market is becoming more and more intense. In order to obtain a better competitive advantage in the market, many magnet manufacturers will use inferior raw materials to reduce costs. Therefore, when buying a strong magnet, we must know how to distinguish the quality of the strong magnet, so that we can buy a relatively high-quality strong magnet.

10-20 

Permanent magnet motor and its characteristics

The maximum power of the permanent magnet motor has reached 1000kW, the minimum diameter φ0.8mm, the highest speed is 300000r/min, and the lowest speed is 0.01r/min. Compared with electric excitation motors, permanent magnet motors have the following characteristics.

10-20 

Main properties of permanent magnet materials commonly used in motors

The permanent magnet materials commonly used in motors include sintered magnets and bonded magnets. The main types are AlNiCo, ferrite, samarium cobalt and neodymium iron boron powerful magnets.

10-20 

What is amorphous soft magnetic?

Amorphous soft magnetic alloy materials and their formation mechanism We classify matter into two types, crystalline and amorphous, according to the arrangement of atoms.

10-20 

The influence of the eddy current loss of the magnet on the temperature rise of the permanent magnet motor's rotor

The rare earth permanent magnet synchronous motor (REPMSM) has the characteristics of small size, light weight and high efficiency. Theoretically, the rotor has no fundamental wave loss, and the temperature rise of the rotor should be low, but this is not the case in practice. Taking an increased-safety rare earth permanent magnet synchronous motor developed by the author as an example, the temperature rise of the rotor was as high as 125°C during the test. If the rotor temperature is too high, it will cause the danger of demagnetization of the neodymium iron boron permanent magnets and affect the normal operation of the motor. This paper analyzes the reasons that may cause the excessive temperature rise of the rotor, and proposes measures to reduce the temperature rise.