How to Choose the Right Power Supply for Your Voice Coil Motor


How to Choose the Right Power Supply for Your Voice Coil Motor

Understanding the Basics of Voice Coil Motors

Voice coil motors (VCMs) are widely used in various industries due to their precise control and high efficiency. These motors consist of a permanent magnet and a coil of wire, also known as a voice coil, which moves within the magnetic field. The movement of the voice coil generates the necessary force to actuate the motor.

To ensure the optimal performance of a voice coil motor, selecting the right power supply is crucial. In this article, we will explore the factors to consider when choosing the perfect power supply for your VCM.

Analyzing Voltage Requirements

One of the primary considerations when selecting a power supply for your voice coil motor is the voltage requirement. It is essential to match the voltage rating of the power supply with the motor's specification. Deviations from the recommended voltage range can lead to reduced motor performance, overheating, or even failure.

To determine the correct voltage, refer to the motor's datasheet or consult the manufacturer. It is worth noting that some VCMs operate on lower voltages, while others require higher voltages, depending on their design and application. Ensure that the power supply can provide a stable and consistent voltage output to sustain the motor's performance.

Factoring in Current Capacity

Apart from voltage, it is essential to consider the current requirements of your voice coil motor. VCMs typically have specific current ratings that should not be exceeded. The power supply should be capable of supplying the required current without significant voltage drops or fluctuations.

To determine the necessary current capacity, refer to the motor's datasheet or consult the manufacturer. It is crucial to select a power supply that can handle the motor's peak current demands to prevent any performance issues. Additionally, taking into account the inrush current, which occurs when the motor starts, can ensure a smooth and stable operation.

Assessing Power Supply Options

There are various power supply options available in the market, each with its advantages and limitations. When choosing a power supply for your voice coil motor, consider the following options:

1. Linear Power Supplies: These power supplies provide a stable output voltage but are less efficient due to their linear regulation. Linear power supplies are suitable for applications with lower power demands and where precision is crucial.

2. Switched-Mode Power Supplies (SMPS): SMPS offers higher efficiency by converting the input voltage into a high-frequency AC signal, which is then rectified and filtered to provide a regulated output. These power supplies are compact, lightweight, and ideal for applications with higher power demands.

3. Unregulated Power Supplies: Unregulated power supplies lack voltage regulation and can result in varying voltages depending on the load. They are suitable for applications with less stringent voltage requirements, but caution must be exercised to avoid exceeding the motor's limits.

Considering Protection Mechanisms

The power supply should incorporate appropriate protection mechanisms to safeguard your voice coil motor from electrical anomalies or operational failures. Some essential protection mechanisms to consider include:

1. Overvoltage Protection: This feature ensures that voltage spikes or surges beyond the specified range do not occur, preventing damage to the motor or other components.

2. Overcurrent Protection: Overcurrent protection prevents excessive current flow that can damage the motor. It automatically detects and cuts off the power supply when the current exceeds the predefined limit.

3. Short Circuit Protection: Short circuits can cause significant damage to the motor. Protection against short circuits ensures that the power supply is disconnected in such events.

4. Thermal Protection: Thermal protection mechanisms monitor the temperature of the motor and power supply, preventing overheating and ensuring safe operation.


Selecting the right power supply for your voice coil motor is crucial for optimal performance and longevity. Analyze the voltage and current requirements of your motor, consider the available power supply options, and ensure the incorporation of essential protection mechanisms. Taking these factors into account will help you choose a power supply that meets your motor's needs, ensuring efficient and reliable operation.


Smooth Motor is a professional stepper motor manufacturer in China, with years of exporting and manufacturing experience. Our main products contain: Linear Stepper Motor, Stepper Motor, Lead Screw And Nut, Voice Coil Motor and Linear Rail Systems, welcome to contact us!
Just tell us your requirements, we can do more than you can imagine.
Send your inquiry
Chat with Us

Send your inquiry

Choose a different language
Current language:English