By Bill Drury; Institution of Electrical Engineers
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Extra info for The control techniques drives and controls handbook, Edition: 2nd ed
Drives market. The trend continues today but there is not a consensus that this is the most suitable shape for all market segments. c drive modules [photograph courtesy of Control Techniques] launched. The ﬁrst drive with a built-in supply-side ﬁlter fully compliant with the then impending EU regulations on conducted EMC was introduced. 10) was launched that met the diverse requirements of a general-purpose open-loop vector drive, a closed-loop ﬂux vector drive, a servodrive, and a sinusoidal supply converter with the selection purely by parameter selection.
Drive introduced. 1960s Power semiconductor voltage and current ratings grow and performance characteristics improve. Inverters became commercially viable, notably in industries such as textiles where a single (bulk) inverter was used to feed large numbers of induction motors (or reluctance motors, despite their low power factor, where synchronisation was required). 1963 Gain –bandwidth relationships of power converters were investigated. 1970 The 1970s saw a new and very signiﬁcant revolution hit the variable-speed drives market – packaging.
A minimum Lmin for values of y ¼ p/2, 3p/2, 5p/2 . . 7. Motoring torque is produced when current i is ﬂowing in the electric circuit and its inductance is increasing with respect to time. Braking torque is produced when the current is ﬂowing in the electric circuit and the inductance is decreasing with respect to time. It can be shown that Te ¼ i2 (dL=dy)=2 (A1:12) where Te is the electromagnetic torque produced on the rotor. 6 could produce unidirectional torque if the current was pulsed. For example, if current only ﬂowed for the period of rotation when the inductance was increasing, then only motoring torque would be produced.