Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: vidam on December 20, 2007, 09:30:46 AM

Title: Motor Bandwidth?
Post by: vidam on December 20, 2007, 09:30:46 AM

What does it mean in layman's terms when they say that a motor has a movement bandwidth of 100KHz?

Title: Re: Motor Bandwidth?
Post by: Admin on January 14, 2008, 09:29:44 AM

got a datasheet?

perhaps it has to do with frequency response for PWM? . . . I wouldn't worry about it for hobby robotics . . .

Title: Re: Motor Bandwidth?
Post by: vidam on January 30, 2008, 09:33:38 AM

Actuator Power is the Frequency, f of operation is the maximum frequency at which the actuator is expected to operate. If time constant, τ is know it can be related to frequency via f=(2πτ)-1.

"useable movement bandwidth to about 100 kHz" must mean then that the motor can operate at this maximum frequency or anywhere in the bandwidth meaning it has pretty high force relative to displacement.

Title: Re: Motor Bandwidth?
Post by: Admin on January 30, 2008, 10:15:43 AM

yea . . . but how do you know what π or τ is?

I wouldn't worry about it.

Quote

Actuator Power is the Frequency

no thats not true . . . power is measured in watts and frequency is measured in Hz . . . :P

Title: Re: Motor Bandwidth?
Post by: vidam on January 30, 2008, 10:34:56 AM

The definition of Actuator power came from a paper I was reading online called "Web-based actuator selection tool". This definition of Actuator Power was given in section 2.1 Inputs. I guess your right then, they made a mistake. I should be more careful next time not to be so trusting.