10 Common Questions About Tiny Precision Magnets

Tiny precision magnets are widely used in micro-motors, magnetic encoders, medical equipment, precision electronics and other fields. Due to their small size, high precision requirements and complex operating environments, customers often raise a range of technical questions during the selection and usage process. Below, Xiao Fu has compiled the 10 most common customer queries and provided answers.

Q1: Does the magnetic force decrease as the size of a micro magnet decreases?

Generally speaking, yes, but this is not always the case. Magnetic force depends not only on volume but is also closely related to the magnetic material grade (e.g. N35, N52), magnetic circuit design and air gap size. Under identical conditions, high-grade magnets can still provide strong magnetic performance even at micro sizes; however, as a general rule, magnetic flux output will decrease significantly due to physical volume constraints.

Q2: What is the smallest size that can be achieved?

This depends on the material; for example, sintered neodymium-iron-boron magnets can typically be produced in sizes as small as φ0.5 mm or even smaller.

Q3: What level of dimensional accuracy can be achieved?

Standard accuracy: ±0.03 mm; Precision grade: ±0.01 mm (1 silk)

Q4: Why are micro-magnets prone to fracturing?

The main reason is that sintered neodymium-iron-boron is a brittle material by nature; combined with its small size and thin edges and corners, it has poor impact resistance.

Ultra-small cylindrical magnet

Q5: Can they be magnetised with multiple poles?

Yes, although this depends on the material. It is a relatively challenging process, as the smaller the pole pitch, the higher the requirements for the magnetisation jig.

Q6: What is their temperature resistance like? Are they prone to demagnetisation?Micro magnets are more sensitive to temperature; even if the nominal temperature is not exceeded, partial irreversible demagnetisation may occur.

Q7: How are micro magnets assembled?

Common assembly methods include: adhesive bonding (epoxy, UV adhesive), press-fitting (interference fit) and embedded injection moulding.

Q8: How long is the lead time for prototyping micro-magnets?

Approximately 2–3 weeks; this will be confirmed in consultation with the magnet supplier.

Q9: Which coating should be chosen?

This depends on the magnet material selected. Ferrite and samarium-cobalt magnets do not require a coating; for neodymium-iron-boron magnets, nickel plating is recommended, whilst black epoxy coating may be selected for harsher environments.

Q10: How do I choose the right magnet material?

For high magnetic strength, choose neodymium-iron-boron; for high-temperature resistance and good corrosion resistance, consider samarium-cobalt or ferrite. Samarium-cobalt offers slightly higher magnetic strength.

The above summarises frequently asked questions from customers regarding micro-precision magnets. Should you wish to make a purchase, please feel free to contact our company.

Related small magnet products:

Tiny Thin Rare Earth Neodymium Disk Magnet 0.5mm x 0.4mm

Tiny radial ferrite cylinder magnet 1.7mm x 3.4mm