This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Brushless DC motors fall into one of two categories. either Trapezoidal or Sinusoidal. This distinction refers to the Back Electromotive Force (Back-EMF) of the motor and is created through the type of winding and magnets used in each style of motor.
Trapezoidal motors are often referred to simply as BLDC motors while sinusoidal motors are usually referred to as PMSM (permanent magnet synchronous motor). Some features and benefits of each motor type are listed below:
Phases Driven per commutation cycle
Low RPM performance
Noise and Vibration
Trapezoidal motors can be driven with Sinusoidal commutation, vice-versa sinusoidal motors can be driven with trapezoidal commutation. The most efficient way to drive a motor of either type is to match the commutation style to the motor winding style.
The motor datasheet should list the BEMF or winding style. If it is not mentioned, the BEMF can be measured using a scope connecting from one phase to another and spinning the motor by hand. A resulting waveform resembling one of the two shown below should be seen:
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.