Aerospace Current Sensor |
| 04-13 20:44:45 来源： 作者： |
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Aerospace Current Sensor Inquiry (采购产品): Aerospace Current Sensor Request for Proposal: +/-850Amp Bus Bar Current Sensor 12/22/2005 Kevin Hanley Eaton Corporation 2250 Whitfield Avenue Sarasota, FL 34243 Phone: (941) 751-7170 Fax: (941) 751-7164 kevinhanley@eaton.com I Scope This request for proposal specifies the requirements for a bus bar mounted current sensor for Eaton Corporation. This sensor will be used in a commercial aerospace application within the pressurized environment and requirements contained herein include, but are not limited to: cost, schedule, envelope, electrical, mechanical, weight and environmental requirements. II. General The sensor will be mounted on a bus bar inside a power distribution box and sense current in two directions. The linear, ratiometric (to the supply voltage input) output voltage will be connected though a shielded cable to another printed circuit assembly (not part of this proposal) where the output voltage will be processed and current levels detected. This proposal does not completely specify the sensor and is not intended to restrict the sensing technology, mounting method or the exact design details of the sensor. Consideration will be given to requests to deviate from the stated requirements below in order to obtain the best overall sensor for the application. III Detailed Requirements A. Electrical Requirements The basic electrical requirements in Table 1 apply throughout the required temperature range. Parameter Minimum Nominal Maximum Units Notes Supply Voltage VS 4.85 5.15 Volts Supply Current IS 50 mA IOUT 10 mA Voltage Output Ratiometric to VS VOUT @ 0.00 Amps 2.5 Volts VOUT @ +850 Amps 4.5 Volts VS=5.000V, (Sensitivity 2.353mV/A) 0 Amp offset 10 mV VOUT @ -850 Amps 0.5 Volts VS = 5.000V Absolute Output Accuracy 2.5 % of FS, -40C to +54C Input Step Response Time (TRESP) 50 usec Table 1: Electrical Requirements B Envelope and Mechanical Requirements Physical: The sensor will be mounted on a bus bar that will be no larger than 1.0” wide by 0.25” thick. Approximately 1.0” of bus bar length is available for sensing the current. The sensor body may extend into the area surrounding the bus bar in any direction 1.0 inch at any point on the bus bar within the available 1.0” of length. The sensor must be permanently fastened to the bus bar. The mounting method is left to the supplier to propose. Adhesives are not preferred. Maximum Weight: .5 lbs. Cable and wires: The wires are Raychem Spec 55A or equivalent that meet SAE 22759. Wire gage to be 24. Cable length will be approximately 6 inches including the terminating connector; the exact length is TBD. The terminating connector will be a 4-circuit locking connector with heavy gold plating (30u-in. minimum) in the contact area with female contacts similar to Molex Mini Fit Jr. It is left to the supplier to propose the exact connector. The cable shield will terminated to one of the connector pins. Unique colors will be used for each of the 3 individual wires. C Materials: Thermoplastics may be used for sensor components including the housing. Similarly, encapsulants may be utilized to protect the printed circuitry, but these materials should be chosen such that they are suitable for the environment. Low smoke, self-extinguishing and flame retardant materials are preferred. The sensor will be mounted to a Ni-plated bus bar. The sensor will be constructed of material that will minimize the likelihood of galvanic corrosion resulting from dissimilar metals. Kapton, Beryllium based alloys, Cadmium and high-strength Aluminum are not allowed. Threaded fasteners shall be positively locked or retained. D Environmental Requirements: Qualification Information: The power distribution box will under go qualification testing by Eaton Corporation. The sensor supplier will be required to submit reasonable evidence to show that the sensor is expected to continue to function normally in the intended application. It is expected that some testing will be required of the supplier. Based on the details of the proposal submitted, a test matrix will be jointly agreed upon. Operating Temperature: -40°C to +54°C Storage and Ground Soaking Temperature: -55°C to +85°C, Electromagnetic: The sensor must not be affected by the stray magnetic fields from relays and large contactor coils located no closer than 1” away. Eaton will supply contactors for the purpose of demonstrating that the sensor will meet this requirement. The sensor will be exposed to radiate electric fields up to 100V/M extending to a frequency of 18GHz. Vibration and Mechanical Shock: The sensor will be robust in the application and show no signs of deterioration during qualification testing. Qualification levels are TBD. E Reliability The supplier will submit a MTBF calculation per MIL-HDBK-217F. The minimum MTBF is TBD. F Commercial Details (Cost and Schedule) Production Price Target: $110. Schedule: Consideration will be given to suppliers that submit a proposal by January 15, 2006. Prototypes: a. Two (2) functional prototypes that meet the electrical and temperature requirements are required by 02/28/2006. These prototypes will be at no cost to Eaton. b. Five (5) “production-like” prototypes are required by 04/15/2006. These may deviate from the production sensor in method of fabrication and assembly process, but must substantially represent the production sensor including envelope, materials and general construction. Production Sensors: a. Five (5) production sensors will be delivered no later than 06/01/2005. b. Additional low quantities of sensors will be required in 2007. c. Thirty-six (36) sensors will be required in 2008, then 125 per year for 5 years. Changes: It is expected that the requirements for the sensor will change and be refined during the development process. The supplier will be responsible for these changes. Once the final design of the sensor is approved, there shall be no changes made by the supplier to the construction and materials used in the sensor without prior permission from Eaton Corporation Engineering. **** Hidden Message ***** Kevin Hanley 2250 Whitfield Ave. Sarastoa, FL 34243 USA Company: Eaton Corp. Title: Electrical Engineer Phone: 941 751 7170 Fax: 914 751 7164 E-mail: kevinhanley@eaton.com **** Hidden Message ***** kevinhanley@eaton.com |
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