Nidec – Thinning of spindle motors for hard disk drives (HDDs)

Create Date: 2024-8-30 12:03:23|Source: Nidec

Ultra-thin laptops of recent years.

Core equipment: HDD motors.

Japan Denco (Nidec), which has the world's No. 1 market share in HDD spindle motors, is also supporting the upgrading and development of notebook PCs by making their motors thinner.

Currently, the thickness of HDDs used in laptops is 7mm. The thickness of the spindle motor built into the HDD is about 70%-75% of the thickness of the disk, and about 5mm thick. The biggest difficulty in making the motor thinner is the track and the space for the bearings supporting the rotor. If the magnetic circuit is simply reduced, the specified magnetic force cannot be guaranteed, and the length of the bearing is several millimeters, and one or two 2.5-inch disks must be stably rotated at a speed of 5,400 rpm and 7,200 rpm. The key issue is how to maintain or further improve the performance of the hard disk drive spindle motor while ensuring that it is miniaturized.

For example, until the advent of 7 mm HDD motors, 9.5 mm HDD motors, which were the mainstream products, were originally designed with a stop inside the shaft to prevent the shaft from falling off. However, in order to have an advantage over the competition, we chose to fundamentally change the design by designing the stop itself to the outside instead of improving the miniaturization of the internal stopper. It is also one of the R&D strategies in the rapidly developing IT business field to design a basic structure that can be used for several generations of products, sometimes by drastically revising the structure itself.
Nidec – Thinning of spindle motors for hard disk drives (HDDs)
Comparison of a spindle motor for a 9.5 mm HDD and a spindle motor for a 7 mm HDD. As a whole, it inherits the basic structure that has been miniaturized and thinned.

The change of the stop from built-in to peripheral
Nidec – Thinning of spindle motors for hard disk drives (HDDs)
In the construction of the 9.5mm generation, the stop that prevents the shaft from flying out is transferred from the inside to the outside.

In 2010, we started mass production of 7mm thick HDDs, and now we have the technology to mass produce 5mm thick HDDs. Japan Denco (Nidec) has an 80% share of the global market, so the company's product development aims to provide products for the global market. Therefore, we do not limit ourselves to the performance of individual products, but also look at the entire QCD, and consider the continuity with the next generation of products in the product development stage, taking into account the future mass production.
Nidec – Thinning of spindle motors for hard disk drives (HDDs)
A long-term manufacturing strategy that takes into account R&D, design, and mass production is a key factor in maintaining the world's No. 1 position.

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