Overview

This document provides detailed technical specifications, characteristics, and design outlines for various models of vibration motors manufactured by Minebea Co., Ltd. It includes electrical parameters, mechanical dimensions, vibration performance data, and construction details for different motor types.

1. Specifications and Electrical Characteristics

The document lists multiple motor models such as KHN4NX3AF, KHN4NB, KHN4NX1AA, KHN4NZ3X, KHN4NZ1X, KHN4NX1RA, and LVM8L3FVA. For each model, key electrical parameters are provided:

• Operating Voltage (V): Typically ranges from 1.1 V to 3.8 V depending on the model.
• Rated Voltage (V): Usually around 3 V to 3.2 V.
• Starting Voltage (V): Values such as 0.4 V to 0.7 V are indicated.
• Starting Current (mA): Varies between 40 mA to 280 mA.
• Rated Current (mA): Typically between 45 mA and 125 mA.
• Rated Speed (r/min): Commonly 7000 to 14000 revolutions per minute.
• Vibration Force (N): Ranges from approximately 0.4 N to 1.5 N.
• Weight (g) and Volume (mm³): Weight ranges from about 0.43 g to 0.88 g; volume is around 55 mm³ to 125 mm³.

2. Mechanical Dimensions and Outline

Dimensions are provided in millimeters with detailed drawings indicating maximum sizes, radii (R2.5, R0.4), and terminal types. Terminal types include Shrimp, Dolphin, and Fin types, which likely refer to different connector designs for electrical interfacing.

Typical maximum dimensions are around 5.2 mm to 5.9 mm in length and 3.0 mm to 4.8 mm in diameter, with specific tolerances noted.

3. Vibration Characteristics and Performance

Graphs and data tables illustrate the relationship between speed (r/min) and current (mA) for various models, showing motor performance at different operating points. Vibration force is correlated with operating voltage and current, indicating motor efficiency and output.

The LVM series motors include detailed vibration frequency and speed data, with vibration amplitude measured in mm/s and frequency in Hz, highlighting their linear vibration motor principle.

4. Construction and Materials

The document mentions the use of heatproof materials suitable for Pb-free reflow soldering processes, including specialized resin, oil, magnet, and coil materials to ensure durability and performance under thermal stress.

The linear vibration motor (LVM) principle is explained, describing the movement of a weight inside the motor that shifts position when the motor is driven ON or OFF, creating vibration through repulsion and resonance mechanisms.

5. Operating Principles and Driving Signals

The motors operate with driving signals from a CPU at frequencies around 150 Hz. The document details the duty cycle for transistor driving (45%) and voltage thresholds (1 V or more) necessary for proper motor operation.

Explanation of the motor's vibration mechanism includes the interaction of magnets, resonant springs, and weights to generate linear vibration.

Critical Information and Best Practices

• Ensure operating voltages and currents remain within specified ranges to maintain motor performance and longevity.
• Use appropriate terminal types based on application requirements for reliable electrical connections.
• Follow Pb-free reflow soldering guidelines using heatproof materials to avoid damage during assembly.
• Consider vibration force and frequency characteristics when selecting motors for specific applications to achieve desired tactile feedback or vibration intensity.