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BS 5000-11:1973 (R12) Specification for rotating electrical machines of particular types or for particular applications - Small-power electric motors and generators, 2005
- BRITISH STANDARD [Go to Page]
- Co-operating organizations
- Contents
- Construction and electrical performance
- 1 Scope
- 2 Definitions
- 3 General [Go to Page]
- 3.1 Types of machine
- 3.2 Degrees of protection by enclosure
- 3.3 Methods of cooling
- 3.4 Dimensions
- 3.5 Information to be given with enquiry and order
- 4 Ratings [Go to Page]
- 4.1 General
- 4.2 Classes of rating
- 4.3 Output ratings
- 4.4 Motors for multiple ratings
- 4.5 Voltage ratings
- 5 General conditions [Go to Page]
- 5.1 Preferred voltages
- 5.2 Preferred frequency
- 5.3 Preferred number of phases for alternating current machines
- 5.4 Machines for non-preferred voltages, frequency and number of phases
- 5.5 Waveform (a.c. machines)
- 5.6 Preferred outputs
- 5.7 Preferred speeds
- 6 Limits of temperature rise and methods of temperature measurement [Go to Page]
- 6.1 Limits of temperature rise
- 6.2 Methods of temperature measurement
- 6.3 Corrections of temperature rise for variations in cooling air temperature [Go to Page]
- Limit of permissible temperature rise in °C
- 6.4 Correction of temperature rise for variations in altitude
- 7 Momentary overloads [Go to Page]
- 7.1 Momentary overload for generators
- 7.2 Momentary overload for motors
- 8 Commutators, brush gear and slip rings [Go to Page]
- Momentary overload for motors
- 9 Full load efficiency
- 10 Power factor
- 11 Tests [Go to Page]
- 11.1 General
- 11.2 Performance tests
- 11.3 Type tests
- 11.4 Routine tests
- 12 Application of tests
- 13 Temperature rise tests [Go to Page]
- 13.1 General
- 13.2 Initial temperature of a machine having a short-time rating
- 13.3 Duration of temperature rise test
- 13.4 Temperature rise test for machines designed to operate over a voltage range
- 13.5 Temperature rise test for machines having more than one rating
- 14 Torque tests
- 15 Commutation test
- 16 High voltage tests [Go to Page]
- 16.1 General
- 16.2 Performance and type tests
- 16.3 Routine test [Go to Page]
- Test voltages
- 16.4 High voltage tests on assembled apparatus
- 17 Test certificates
- 18 Tolerances on characteristics of machines
- 19 Terminal and lead markings
- 20 Radio interference [Go to Page]
- Tolerances
- 21 Information to be given on the machine
- 22 Rating of capacitors
- Metric dimensions
- 23 Frame designation [Go to Page]
- Suffix letters
- 24 Letter symbols
- 25 Dimensions, tolerances and limits
- 26 Access for flange-fitting bolts
- 27 Electric connections [Go to Page]
- Letter symbols to indicate dimensions [Go to Page]
- Symbols for dimensions of foot-mounted machines without flanges
- Symbols for dimensions of flange-mounted machines and foot-mounted machines provided with a flange
- Standard dimensions for foot-mounted or resilient base-mounted machines
- Standards dimensions for flange-mounted machines
- Notes on the torque characteristics and application of induction motors [Go to Page]
- Notes on the torque characteristics and application of induction motors
- This appendix on torque characteristics is intended to serve only as a guide to generally accepted practice in regard to small-power induction motors. These motors are generally available with torque characteristics as shown in Table 5, expressed as per [Go to Page]
- Torque characteristics
- Motor applications [Go to Page]
- Split-phase
- Capacitor start induction run11). These motors, having higher locked rotor torques and lower locked rotor currents than split-phase motors, are generally more suitable for loads of higher inertia and more frequent starting.
- Capacitor start, capacitor run11). These motors have characteristics similar to those covered by A.2.2 but are more suitable for use when a greater degree of quietness or a higher efficiency and power factor are desirable.
- Capacitor start and run. These motors are for use where low locked rotor torques are acceptable. They are also generally quieter than split-phase or capacitor start induction run motors.
- Shaded pole. These motors are suitable for all applications where only a very low locked rotor torque is required and motor efficiency is unimportant.
- Polyphase. Polyphase motors will generally satisfy all requirements which are met by single-phase machines of similar torque ratings.
- Information to be given with enquiry and order [Go to Page]
- Information to be given with enquiry and order
- When enquiring about, or ordering, an electrical machine to be rated in accordance with this standard, the general particulars listed in B.1.1 should be supplied. [Go to Page]
- General. The following general information should be supplied:
- Additional information applicable to motors. The following information should be furnished in addition to that specified in B.1.1:
- Additional information applicable to generators. The following information should be supplied for generators:
- Terms and definitions [Go to Page]
- Terms and definitions [Go to Page]