Silicone Controlled Rectifier VS. Pulse Width Modulation
Silicone Controlled Rectifier VS. Pulse Width Modulation
(OP)
Can someone please help me understand the practical meaning of these two "terms" or "methods"? Let's put it into context:
In order to control a, say BLDC 1/10HP motor one needs a DC motor drive. In my case 115VAC power source and an output DC voltage of 0-90VDC usually, for a 1/4 HP motor drives. The rating is usually 1/4 for SRC motors and 1/3 for PWM motors. Not entirely sure what that means, or why the difference in HP range.
The control signal can be by way of "signal following input voltage range 0-5DC" or by way of potentiometer. This is the example here:
http://www.electrosales.com/kb/pdf/kbws.pdf
I can't seem to figure out if PWM is actually "performed" by the driver, and why the driver is specified as for both "SCR or PWM" motors. Any clarification would help me with my scrambled brainsauce. Thanks!
In order to control a, say BLDC 1/10HP motor one needs a DC motor drive. In my case 115VAC power source and an output DC voltage of 0-90VDC usually, for a 1/4 HP motor drives. The rating is usually 1/4 for SRC motors and 1/3 for PWM motors. Not entirely sure what that means, or why the difference in HP range.
The control signal can be by way of "signal following input voltage range 0-5DC" or by way of potentiometer. This is the example here:
http://www.electrosales.com/kb/pdf/kbws.pdf
I can't seem to figure out if PWM is actually "performed" by the driver, and why the driver is specified as for both "SCR or PWM" motors. Any clarification would help me with my scrambled brainsauce. Thanks!





RE: Silicone Controlled Rectifier VS. Pulse Width Modulation
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Sometimes I only open my mouth to swap feet...
RE: Silicone Controlled Rectifier VS. Pulse Width Modulation
RE: Silicone Controlled Rectifier VS. Pulse Width Modulation
Also, a PWM solution has an inherently linear relationship between duty cycle and resulting time-averaged voltage, but the SCR solution has a distinctly non-linear relationship. I don't know how well inexpensive SCR drives compensate for this non-linearity.
Curt Wilson
Delta Tau Data Systems