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1985
Direct current (DC) motors have been dominating the field of adjustable speed drives for over a century; they are still the most common choice if a controlled electrical drive operating over a wide speed range is specified. This is due to their excellent operational properties and control characteristics; the only essential disadvantage is the ...
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Direct current (DC) motors have been dominating the field of adjustable speed drives for over a century; they are still the most common choice if a controlled electrical drive operating over a wide speed range is specified. This is due to their excellent operational properties and control characteristics; the only essential disadvantage is the ...
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Converters and DC-Machine Control
1995It was found from the transfer-functions of the separately excited DC-machine that modification of the torque needs control of the armature current and modification of the speed requires control of either the armature voltage or the excitation voltage. Changing the speed-torque characteristic using series resistors is possible in principle but leads to
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Evaluation of losses in DC machines - A statistical approach
IEEE Transactions on Industry Applications, 1990The power ratings of the drive systems used in cyclic duty applications such as flying-die and cut-to-length shears are dictated by the thermal considerations associated with the losses produced by the machine during an operation cycle and the specified production rate.
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An investigation into improving the commutation of a DC machine
Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting, 2002A primitive slip-ring machine mode is used to describe a DC machine. From this model an expression is derived to describe the voltage which, if allowed to exceed a certain value, causes commutator sparking and is thus an indication of ineffective commutation.
G.M.J. Parsley, C.F. Landy, A.S. Meyer
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Theory of Brushless dc Machines
2009This chapter contains sections titled: Introduction Voltage and Torque Equations in Machine Variables Voltage and Torque Equations in Rotor Reference-Frame Variables Analysis of Steady-State Operation Dynamic Performance References ...
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Modeling and Supplying DC Machines
2012In this chapter, mathematical model is developed for DC machines with excitation windings and DC machines with permanent magnet excitation. The block diagram of the model is used to provide a brief introduction to the torque control. Steady-state equivalent circuits are derived and explained for armature and excitation windings. These circuits are used
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Machine learning for microbiologists
Nature Reviews Microbiology, 2023Francesco Asnicar +2 more
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Machine learning sheds light on microbial dark proteins
Nature Reviews Microbiology, 2023A T Hammack, Crysten E Blaby-Haas
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