AC Power to run a 130v DC motor with speed control

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You will indeed need a bridge rectifier to convert the AC power to DC. Additionally, you may consider using a speed controller to regulate the motor’s speed. Here’s a step-by-step breakdown of what you might need and how to approach this project:

Components Needed:

  1. Bridge Rectifier: You’ll need a bridge rectifier to convert AC power to DC. Look for one rated for the voltage and current requirements of your motor. Since your motor operates at 130V DC, you’ll need a rectifier that can handle at least this voltage.
  2. Capacitor (Optional): A capacitor can help smooth out the DC output, reducing voltage ripple. The size of the capacitor depends on the desired level of smoothing and the current requirements of your motor. A capacitor rated for higher voltage (e.g., 150V) and sufficient capacitance (microfarads) should work.
  3. Speed Controller: A speed controller will allow you to vary the voltage supplied to the motor, thus controlling its speed. Choose a DC motor speed controller compatible with the voltage and current rating of your motor.

Wiring and Connections:

  1. Connect the AC power source to the input of the bridge rectifier. Ensure that you match the correct AC terminals (line and neutral).
  2. Connect the DC output of the bridge rectifier to the input of the speed controller.
  3. Connect the output of the speed controller to the DC motor. Make sure to connect the positive (+) and negative (-) terminals correctly. The speed controller should have terminals labeled for motor connection.
  4. If you choose to use a smoothing capacitor, connect it in parallel across the DC output of the bridge rectifier, paying attention to the polarity (positive to positive, negative to negative).
  5. Ensure proper grounding for safety.


  1. Turn on the AC power source.
  2. Adjust the speed controller to control the motor’s speed. Be cautious when making adjustments, especially if you’re not aiming for precise RPM control.

Important Considerations:

  1. Safety: Ensure that your setup is safe and properly grounded. Use appropriate electrical safety precautions.
  2. Compatibility: Make sure all components (rectifier, capacitor, speed controller) are compatible with the voltage and current ratings of your motor.
  3. Overheating: Monitor the temperature of the motor during operation. Prolonged operation at high speeds may cause overheating. Allow the motor to cool down if necessary.
  4. Voltage Rating: Pay attention to voltage ratings throughout the setup. Exceeding the motor’s voltage rating could damage it.
  5. Start Slowly: When testing your setup for the first time, start with a low voltage setting on the speed controller and gradually increase it to avoid sudden jerks or high-speed starts.
  6. Experiment Safely: Since you’re learning, experiment with different settings and observe how they affect the motor’s behavior.

Always prioritize safety, and if you’re unsure about any aspect of this project, seek guidance from an experienced individual or an electrician. Additionally, ensure that your project complies with local electrical codes and regulations.

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