>The motor has only Hall sensors. Do the Hall sensors have an analog
>output in order to be able to position the rotor at a desired angle from
>the sensors?
I think that Hall Effect sensors are sinusoidal output. At least
with my experience with them. The ones that I have worked with have an a,
not a, b, not b and z, not z. They are converted to TTL square wave in the
drive itself. They work more like an Inductosyn linear scale. Signal
amplitude is critical, to much and the drive will start clipping and giving
you false feed back or throwing alarms. I think plain old encoders are a
better bet for a bridgeport. Hall effect sensors are to sensitive and to
expensive to replace if you need to. Use a tach for speed and an encoder for
position.
Dave
----- Original Message -----
From: "Kirk Wallace" <[EMAIL PROTECTED]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Sent: Monday, October 22, 2007 4:43 PM
Subject: [Emc-users] Brushless Amps
>I have a Pacific Scientific R46GENA DC brushless servo motor that I
> would like to use for my Bridgeport conversion, so I am looking for a
> amp/driver to drive it.
>
> The specifications are on page 26 here:
>
> http://www.pacsci.com/support/documents/pc800/svomtrs.pdf
>
> I don't know if it is a sinusoidal or trapezoidal motor so if anyone has
> a way to determine this, please let me know. Is the difference in the
> drive just software?
>
> The specifications indicate an RPM of 1,700 at 240 Vac, 320 Vdc and 16.5
> Amps max., so I assume that I need a 320 Vdc 20 Amp motor supply?
>
> The motor has only Hall sensors. Do the Hall sensors have an analog
> output in order to be able to position the rotor at a desired angle from
> the sensors?
>
> Could the Pico Systems PWM brushless amp be used as a basis for my
> application? In other words, could I change the power components to
> higher voltage/current?
>
> Is a continuous stall torque of 7.6 Nm (67.3 lb*in), and a peak torque
> of 20.2 Nm (179 lb*in) appropriate for a Bridgeport? My plan is to have
> a direct coupling between the motor and ballscrew. I have some Sanyo
> P5's but at 3.9 Nm (46 lb*in) continuous and 11.7 Nm (139 lb*in) peak
> torque, but they seem a little small.
>
> --
> Kirk Wallace (California, USA
> http://www.wallacecompany.com/machine_shop/
> Hardinge HNC lathe
> Bridgeport mill conversion pending
> Zubal lathe conversion pending)
>
>
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