Controlling Motor Speed with PWM: Advantages and Alternatives Explained

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In summary, the conversation discusses using Pulse Width Modulation (PWM) to control the speed of a motor using a 68hc12 microcontroller. The PWM module utilizes a potentiometer connected to an ATD channel to determine the duty cycle of the output pulse wave, which drives the motor at a set frequency. The question is then asked about the advantages of using PWM compared to other alternatives, such as function generators, for driving the motor. The thread from the EE forum and the importance of considering the motor's impedance and inductance are mentioned as helpful resources in understanding the advantages of PWM.
  • #1
EvLer
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I need some help on lab questions...

a short description: we are using Pulse Width Modulation (PWM) module of a 68hc12 microcontroller to control speed of a motor hooked up to the microcontroller; the potentiometer connected to ATD channel provides a DC voltage that is sampled using ATD module which determines the duty cycle of the output pulse wave, and based on the settings of the PWM registers, that pulse wave is driving the motor at a set frequency.

So the question is: what are the advantage of using PWM vs other alternatives?

All i can think of is function generator, what could other alternatives can drive motor?
And as far as advantages, well... it allows one to set the frequency and duty cycle, and generate interrupts stuff like that... is there something i am missing?
Thanks in advance...
 
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  • #2
Here's a recent thread from the EE forum that will help you out:

https://www.physicsforums.com/showthread.php?t=116324

Also, when thinking about this problem, remember what you are driving in the motor. When the rotor is stopped, the value of inductance and impedance is very low, right? What is the drive impedance at full speed? So what is it in between?
 
  • #3
oh, right... thanks berkeman... :smile:
 

Related to Controlling Motor Speed with PWM: Advantages and Alternatives Explained

1. How is motor speed controlled?

Motor speed is controlled through various methods, such as changing the voltage or current supplied to the motor, adjusting the frequency of the power source, or using a motor controller to regulate the speed. The specific method used depends on the type of motor and its intended application.

2. What factors affect motor speed?

The speed of a motor can be affected by several factors, including the load on the motor, the input voltage, the type of motor, and any external factors such as temperature or friction. Additionally, the design and construction of the motor can also impact its speed capabilities.

3. How does changing the voltage affect motor speed?

Changing the voltage supplied to a motor can directly impact its speed. In most cases, increasing the voltage will result in an increase in motor speed, while decreasing the voltage will slow the motor down. However, this relationship may not always hold true and can vary depending on the specific motor and its load.

4. What is a motor controller and how does it control motor speed?

A motor controller is an electronic device that regulates the speed of a motor. It does this by adjusting the voltage, current, or frequency supplied to the motor, based on the input from sensors or user controls. Motor controllers can also provide other features such as overload protection and dynamic braking.

5. Can motor speed be controlled without a motor controller?

Yes, motor speed can be controlled without a motor controller, but it may be more limited and less precise. Some motors have built-in speed control capabilities, such as variable speed drives or adjustable pulley systems. However, for more precise and versatile control, a motor controller is often necessary.

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