Editing Motor driver
Jump to navigation
Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 16: | Line 16: | ||
A single phase AC motor is generally driven in the same way as a DC motor, however instead of operating the motor drive as a constant DC voltage (in either the 'forward' or 'reverse' direction) the AC motor is driven by an approximation to a sinewave. This approximation is created using the H bridge and driving it with a PWM input <s>such that both the positive and negative voltage periods are the same</s>. This is normally achieved either using a sawtooth waveform compared against a sine wave reference, or is done using a lookup table in a microcontroller. | A single phase AC motor is generally driven in the same way as a DC motor, however instead of operating the motor drive as a constant DC voltage (in either the 'forward' or 'reverse' direction) the AC motor is driven by an approximation to a sinewave. This approximation is created using the H bridge and driving it with a PWM input <s>such that both the positive and negative voltage periods are the same</s>. This is normally achieved either using a sawtooth waveform compared against a sine wave reference, or is done using a lookup table in a microcontroller. | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
[[Image:pptrans.png | frame | Push Pull Transistor Circuit: one half-bridge. (Fixme: show the flyback diodes, and convert to the more common MOSFET drive transistors ... also replace the resistive "load" with a (M) motor symbol.)]] | [[Image:pptrans.png | frame | Push Pull Transistor Circuit: one half-bridge. (Fixme: show the flyback diodes, and convert to the more common MOSFET drive transistors ... also replace the resistive "load" with a (M) motor symbol.)]] |