N38H Micro Coin Magnet for Moving-Magnet Voice Coil Actuator

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N38H Micro Coin Magnet for Moving-Magnet Voice Coil Actuator   Technical Specifications:
Item:     MP-NDN38H-89
Grade:  N38H
Material: Neodymium (NdFeB)
Plating:    Zinc / Nickel
Shape:    Ring, Botton, Coin
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

A coin vibrator motor magnet, often simply referred to as a “coin motor magnet,” is a component used in coin vibrator motors. Coin vibrator motors are small, compact motors that are commonly found in various devices, such as mobile phones, pagers, gaming controllers, and other handheld electronics. These motors are designed to create vibration, typically for haptic feedback or alert notifications.

The magnet in a coin vibrator motor plays a crucial role in its operation. Here’s a brief overview of how it works:

Basic Structure of a Coin Vibrator Motor:
A coin vibrator motor consists of several key components: a coil (wire winding), a magnet, and an eccentric weight. The coil is mounted on a platform, and the eccentric weight is attached to the shaft of the motor.

Principle of Operation:
When an electrical current flows through the coil, it generates a magnetic field around the coil. This magnetic field interacts with the magnet, causing the magnet to be attracted or repelled, depending on the direction of the current.  N48 Powerful Coin NdFeB Magnets fits Voice Coil Motor

Vibration Generation:
The interaction between the magnetic field generated by the coil and the permanent magnet results in a force that causes the motor’s eccentric weight to move. As the weight moves, it creates an imbalance in the motor’s rotational symmetry. This imbalance generates vibrations, which are transferred to the device in which the motor is installed.

The moving-magnet actuator allows the magnet to move and keeps the coil fixed so that the heat generated by the coil assembly can be more readily managed; since the coil is on the outside of the moving-magnet actuator, the heat generated is also on the outside. Thus, this actuator provides a good thermal path and much better heat dissipation. The other tradeoff, however, is increased moving mass and lower acceleration.  Precision Coin Magnets N42 for Shaftless Vibration Motor

Safety
In many medical applications, magnetic latches and springs are used to allow the VCA to stay in a “home” position when not energized. In other words, the actuator function is maintained even without the heat that is generated when power is on. This safety feature can prevent potential overheating that could cause it to burn up, be too hot to hold, or affect something else near the actuator that is sensitive to temperature.

Another important safety feature can be illustrated through the example of ventilator valves. Here, if the power is shut off, the valve can stay open and allow the patient to continue to breathe on his/her own.

Irrespective of safety issues, magnetic latches and springs can also reduce the overall size of the medical device by eliminating the need for external springs or other types of control/safety features.

Force/torque and stroke
However, to take advantage of that benefit, it is necessary to first ensure that the VCA force capabilities can overcome the force of the latch or spring being used (see Fig. 2 ). The control scheme must be designed so that it does not inadvertently overdrive the VCA because the VCA will only do what it is told to do. This means that the VCA must be configured properly to protect sensitive hardware to which it may be attached from damage.