Micro N40SH VCM Voice Coil Motor Magnets

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Micro N40SH VCM Voice Coil Motor Magnets Technical Specifications:
Item:     MP-NDN40SH-35
Grade:    N40SH
Material: Neodymium (NdFeB)
Plating:    Zinc / Nickel
Shape:    Round, Disc, Disk, Circular, Circle
Dimension: Customer Design Drawing
Tolerance: ±0.05 mm
Magnetisation Direction: Axial / Radial
Residual Magnetic Flux Density (Br): 1280-1320 mT (12.8-13.2 kGs)
Energy Density (BH)max: 318-342 KJ/m³ (40-43 MGOe)
Coercivity Force (Hcb): ≥ 915 kA/m ( ≥ 11.5 kOe)
Intrinsic Coercivity Force (Hcj): ≥ 955 kA/m ( ≥ 12 kOe)
Maximum Operation Temperature: 80 °C
Delivery Time: 14-35 days

The VCM voice coil motor is an important part of the AF (Auto Focus) camera module. It can move the lens up and down to switch between near focus and far focus, making pictures clearer. Similar to the principle of the speaker, the magnetic steel provides a permanent magnetic field in the camera module, and the energized coil will be subjected to force in the magnetic field, thereby dragging the lens to move back and forth. Different lenses have different functions, and the shape and performance of the magnetic steel inside are quite different.

Rare Earth magnets are the strongest magnets in the world. These magnets have pulled several times their weight. You receive Shape Disc Quantity 1000 Diameter 1mm (Neodymium Iron Boron)
These incredible magnets are great for anything that you would use Velcro, brass fasteners, hinges, pins, etc.
My clients range from craft companies to hobbyists to painters to carpenters to purse makers. These little magnets have MILLIONS of applications.
WARNING! These magnets should be kept away from any animal or human who might try and eat them, they have the potential to separate and pinch intestines causing serious and life-threatening complications.

The interaction between the magnetic field generated by the permanent magnet and the magnetic field produced by the current flowing through the voice coil creates a force known as Lorentz force. This force acts perpendicular to both the direction of the current and the magnetic field, resulting in a linear or rotational motion of the voice coil, depending on the design of the VCM.

The strength of the magnetic field generated by the permanent magnet is a crucial factor in determining the performance of the VCM. A stronger magnetic field allows for greater force generation and thus enables faster and more precise movements. Therefore, magnets with high magnetic flux density, such as neodymium magnets, are often preferred for VCM applications.

In addition to the permanent magnet, some VCM designs incorporate additional magnets to enhance their performance. These additional magnets can be placed in various configurations, such as radial or axial arrangements, to further optimize the magnetic field distribution and improve the overall efficiency of the VCM.

It is worth noting that while permanent magnets are commonly used in VCMs, there are also designs that utilize electromagnets instead. Electromagnets offer the advantage of adjustable magnetic fields by varying the current passing through them. However, they require a continuous power supply to maintain their magnetic field, unlike permanent magnets. N45 NdFeB Magnets for Auto Focus Camera in Smartphones

The voice coil motor (VCM) is an essential component in various devices, including loudspeakers, hard disk drives, and optical disk drives. Magnets play a crucial role in the operation of the VCM, providing the necessary magnetic field for its functionality.  Tool-making and Molding Services

In the context of the VCM, magnets are used to generate a magnetic field that interacts with the current flowing through the voice coil. This interaction produces a force that moves the coil, resulting in the desired motion of the device. Blcok N45SH Magnets in Linear Resonance Actuator

To understand how magnets are utilized in the VCM, it is important to first grasp the basic principles of electromagnetism. According to Ampere’s law, a current-carrying conductor generates a magnetic field around it. This magnetic field can be intensified by placing a ferromagnetic material, such as iron or a magnet, near the conductor. The resulting magnetic field lines form closed loops around the conductor and are concentrated within the ferromagnetic material.  FEA Capabilities and Magnetic Design

The permanent magnet in the VCM is usually shaped like a cylinder or ring and is positioned in close proximity to the voice coil. The voice coil itself consists of a wire wound into a coil shape and is attached to a diaphragm or other movable component. When an electric current passes through the voice coil, it becomes an electromagnet due to Ampere’s law.  Reverse Engineering Services