MODIFICATION
36 -- BRUSHLESS DC MOTOR
- Notice Date
- 5/24/2006
- Notice Type
- Modification
- NAICS
- 335312
— Motor and Generator Manufacturing
- Contracting Office
- NASA/Goddard Space Flight Center, Code 210.M, Greenbelt, MD 20771
- ZIP Code
- 20771
- Solicitation Number
- NNG06152245L
- Response Due
- 5/29/2006
- Archive Date
- 5/24/2007
- Description
- This is a modification to the synopsis entitled Brushless DC Motors, Solicitation No. NNG06152245L which was posted on May 8, 2006. You are notified that the purpose of this modification is to answer questions that were submitted. 1. Would NASA be willing to accept an offer for a housed DC motor for this requirement? No, That would require changing many other things which is not acceptable. 2. The shaft tolerances are very tight and we need relief on the 1,372 dimension's tolorance of +/- 0.0001. We would request no less than +/- 0.0002. Is this acceptable? No, the shaft tolerance must be what is in the specification to fit with other parts that are on order. This tolerance has been met in the past. 3. The shaft roundness of 0.0002 is also difficult to maintain and we would like to pursue how much this tolerance could be increased? This tolerance cannot be increased. This is also necessary to assure a good fit with other parts that are already on order. This tolerance has also been met in the past. 4. The end feature of the hex hole on the shaft has a +/- 0.005 tolerance which is not necessary. This is an implied tolerance because it is not specified and the 3 significant figures dictates this tolerance. We feel this is for some kind of allen wrench hole used to hold the shaft during tightening and assembly. We would request this tolerance be +/- 0.010. Is this acceptable? Drawing 2087009 has a hex hole on both ends dimensioned as .158 +.002/-.000 AF. It is for an allen wrench. The tolerance could possibly be larger (maybe +.003/-001), but not as large as +/- .005 or +/- .010. This could lead to an unacceptably sloppy fit or the hole being too small for the wrench. 5. The operating voltage called out in 3.3 has a range from 22.5 ~ 33.5 volts. If we have to meet the operating point at the low voltage, our motor constant would be very high for the package and the resistance very low. This would make manufacturing the motor very difficult. However, if we are allowed to design for closer to the nominal of this range, the motor is much easier to produce. Please comment. The operating point must be met as stated in the specification (at 22.5 volts). This stems from a system requirement and cannot be changed. 6. Section 5.0 Testing asked for 3 independent tests of hysteresis, eddy current and cogging. The eddy current and hysteresis would have to be combined test giving one value for total iron loss for these 2 values. We do not have the means to test each separately. Will this be acceptable? this is acceptable. 7. The torque of 0.21 N.m and a speed of 370 r/s min is specified. We understand this to mean that these two items form the load point. Is this correct or is one the stall torque and the other a no-load speed giving a lighter runningload point? These two items form the load point. The motor must provide 0.21 Nm of torque when spinning at 370 rad/s and supplied with 22.5 volts. Other constraints apply to the load point, as stated in the specifications. The due date for responses is not extended. Documents related to this procurement will be available over the Internet. These documents will reside on a World Wide Web (WWW) server, which may be accessed using a WWW browser application. The Internet site, or URL, for the NASA/GSFC Business Opportunities home page is http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=51 Offerors are responsible for monitoring this site for the release of the solicitation and any amendments. Potential offerors are responsible for downloading their own copy of the solicitation and amendments (if any).
- Web Link
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Click here for the latest information about this notice
(http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=51#120131)
- Record
- SN01056754-W 20060526/060524221538 (fbodaily.com)
- Source
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