MIL-DTL-17060G(SH)
APPENDIX C
TEST PROCEDURES FOR MOTOR EFFICIENCY
C.1. SCOPE
C.1.1 Scope. This appendix covers the efficiency testing procedures, conditions, and calculations for
polyphase induction motors that are constructed to meet high efficiency requirements. This appendix is a mandatory
part of the specification. The information contained herein is intended for compliance.
C.2. APPLICABLE DOCUMENTS
C.2.1 Non-Government publications. The following document forms a part of this appendix to the extent
specified herein. Unless otherwise specified in the solicitation or contract, the most recent issue date of the
document is applicable.
INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)
IEEE 112
-
IEEE Standard Test Procedure for Polyphase Induction Motors and
Generators
(Copies of this document are available from the Institute of Electrical and Electronics Engineers, Inc., 445 Hoes
Lane, P.O. Box 1331, Piscataway, NJ 08855-1331 or online at www.ieee.org.)
C.3. REQUIREMENTS
C.3.1 Motor efficiency tests. Except as specified herein, motor efficiency tests shall be performed in
accordance with IEEE 112, Method B (Input-Output with Loss Segregation).
C.3.2 Order of precedence. In the event of conflict between this appendix and IEEE 112, this appendix takes
precedence.
C.4. PROCEDURES
C.4.1 Test sample. The motor(s) shall be selected from normal production.
C.4.2.1 Digital meters. Digital meters shall be read above 15 percent of their scale range.
C.4.2.2 Analog meters. Analog meters shall be read above 50 percent of their scale range.
C.4.2.3 Accuracy. The accuracy of voltmeters and ammeters shall be at least 0.25 percent of full scale. The
accuracy of wattmeters and torque meters shall be at least 0.1 percent of full scale.
C.4.2.4 Temperature measuring equipment. Temperature measuring equipment for the efficiency test shall be
the same equipment used during the heat run test.
C.4.3 Measurements.
C.4.3.1 Power. The total power read on a wattmeter shall be reduced by the amount of losses in the voltage
circuits of the wattmeter whenever this loss is a measurable portion of the total power read.
C.4.3.2 Slip. The accuracy of slip measurements shall be within ±5 percent of slip speed.
C.4.3.3 Temperature. Winding temperature shall be determined by the resistance method or by thermocouple
(see C.4.4.2).
C.4.4.1 General. Data for efficiency calculations shall be obtained from six load points, approximately equally
spaced, between 25 percent and 150 percent of motor rated torque. This data shall not be obtained until temperature
stabilization is attained.
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