The question of whether toroidal transformers are "better" depends on the specific application and what characteristics are most important for that application. Toroidal transformers have several advantages and some disadvantages compared to traditional laminated transformers. Here’s a detailed look at their characteristics:
Toroidal transformers are generally more efficient than laminated transformers. This is due to their design, which allows for a more compact winding and core structure, minimizing energy loss through heat.
They tend to be lighter and smaller than equivalently rated laminated transformers, which can be advantageous in applications where space and weight are concerns.
The closed-loop core of a toroidal transformer produces less external magnetic field, meaning less electromagnetic interference (EMI) with surrounding circuits and devices.
The design and construction of toroidal transformers often result in lower mechanical hum, which can be beneficial in audio applications and environments requiring low noise levels.
They typically have lower off-load losses (also known as no-load losses), which can be an advantage in applications where transformers are powered but not always under load.
The initial cost of toroidal transformers can be higher than laminated transformers due to more complex manufacturing processes and the need for special winding machinery.
They require a different mounting method than traditional transformers, which can sometimes be a disadvantage in certain applications or retrofit situations.
While they are more efficient, once toroidal transformers do heat up, the donut shape can retain heat longer than an E-I core, which can be a drawback in high-power applications.
Due to their construction, toroidal transformers can be more difficult to repair or modify after manufacturing.
Toroidal transformers can be better for applications that require compact size, high efficiency, low electromagnetic interference, and noise. However, they may not be the best choice when cost is a primary concern, or in situations where their thermal characteristics or difficulty in mounting and repair present problems.
The decision on whether to use a toroidal transformer should be based on a careful consideration of these factors in relation to the requirements of the specific application.
