SBK Auto-Transformer

The SBK auto-transformer is a compact voltage conversion solution specifically designed for industrial scenarios with limited space and strict requirements for efficiency. It eliminates the need for isolated windings and achieves a 30% reduction in volume and a 25% weight reduction at the same capacity through a shared coil structure, achieving high power density.

Core Technology

The core technology of the SBK auto-transformer lies in the use of 0.35mm thick 120 model cold-rolled oriented silicon steel sheets and high-temperature resistant enameled flat copper wires, combined with a layered winding process, ensuring an operating efficiency higher than 98% even at 75% load rate, and effectively suppressing harmonic heating.

The voltage regulation system uses nickel silver alloy carbon brushes and phosphor bronze alloy rails, with stable contact, supporting over 100,000 adjustments.

It is typically used in flexible startup of motors below 55kW, voltage adaptation of production lines (such as compensating the voltage difference from 380V to 400V), and wide-range voltage output of equipment test platforms.

When selecting the SBK auto-transformer, the capacity must meet the formula: ≥ 1.2 × [Equipment rated power (kW) ÷ (0.8 × Power factor)] + Maximum single-unit startup surge capacity.

Essentially, this product is a professional tool provided for engineers who deeply understand the auto-transformer principle. In scenarios where electrical isolation is not required and extreme space and efficiency are pursued, it is the most direct and efficient solution.

Product Information

FAQ

Q: Under what circumstances should SBK auto-transformer be used, and under what circumstances should it never be used?

A: The applicable scenarios for SBK auto-transformers (without isolation required for voltage regulation/transforming):

✔ Motor soft start and speed control: It can limit the motor starting current and perform small-scale speed adjustment.

✔ Stable voltage/compensating voltage drop: When the grid voltage is low, this transformer can raise the voltage to the equipment's rated value (e.g., 380V to 400V).

✔ Test power supply for equipment: It can provide a flexible adjustable test voltage for laboratories or production lines.

Do not use in:

● Any situation that may involve personal safety and requires protection against electric shock.

● For handheld electric tools, medical equipment, laboratory countertop sockets.

● In humid, flammable, and explosive hazardous environments.

● For power supplies of precision instruments that require complete isolation from grid interference.

Q: What are the special features of the materials and processes?

A: The SBK auto-transformer is designed for industrial reliable applications. Key materials and processes ensure its performance:

Core: uses 0.35mm thick cold-rolled oriented silicon steel sheets to ensure low no-load loss and low operating noise.

Windings: use H-class (180℃) enameled flat copper wire, with high heat resistance and strong overload capacity.

Voltage regulation mechanism: a combination of nickel-silver alloy carbon brushes and phosphor bronze alloy rails, ensuring good conductivity, wear resistance, and low contact resistance, with long adjustment lifespan.

Insulation treatment: processed by vacuum impregnation (VPI) technology, which is moisture-proof, shock-resistant, and has good heat dissipation.

Q: Can the SBK auto-transformer be used as an automatic voltage stabilizer?

A: No. The standard SBK auto-transformer is manually adjusted or adjusted to preset points through servo motor drive. It does not have the voltage stabilization function of real-time monitoring the output voltage and automatically adjusting it.

If you need to deal with the real-time fluctuations of the power grid voltage and maintain stable output, you should choose a dedicated automatic voltage stabilizer, which is also one of the series that Yibaling can offer.

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