When controlling the excitation current, a maximum reliable excitation current is taken into account.
The excitation current control unit controls the excitation current of the motor on the basis of an excitation current command onto which a high frequency current command is superimposed.
The measuring device electronics delivers an excitation current driving the exciter arrangement.
Furthermore, the amplitude of the excitation current is independently variable of the timing and duration of the application of the excitation current to the windings.
The energization circuitry provides the excitation current to the phase windings from a power supply.
To decrease the flow of the inductor (flow of excitation) by a reduction of the operate current by maintaining the supply voltage of the armature constant.
For a weak variation of the operate current of the generator, it was possible to control enormous powers of engines with D.C. current in a range of variation very wide speed.
An excitation current flowing into a field winding (2) is detected and is controlled by a field current limiting circuit (5), such that the excitation current will not exceed a maximum excitation current while the generator is hot.
A microprocessor routine (362) calculates motor speed from the motor armature voltage, field current and armature current.
The microprocessor programmed to generate an armature current setpoint signal, a field current setpoint signal, and an armature voltage reference signal.
The rotor of the reluctance motor and the inverse speed motor is provided with an excitation winding to which a transistor is assigned that allows the motor to be braked in a sensitive manner so as to control the field current.
The spread of the release threshold is reduced by means of the adjustment element (36) and especially in an fault current switch because the release (8) always releases when defined field currents occur.
According to the method, in order to start the exciting current, the exciting current is quickly increased to an exciting current threshold value, starting from zero, using the exciting current limiting function.
The controller-semiconductor component comprises an exciting current limiting function for limiting the exciting current to an exciting current threshold value.
Exciting current and compensation current are calculated.
The current regulating circuit regulates the exciting current that flows through the exciting coil depending on a current set value curve.
Further, the exciting current is a saw-tooth wave whose current value at the last stage is larger than that at the initial stage in order to improve the rise in the exciting current.
The energization current sensor (40) includes an energization current resistor (42) disposed within the energization current path of the winding (16).
The energization current resistor (42) is adapted to produce an energization signal in response to the energization current flowing through the winding (16).
During the actuation, the actuating current is observed.
The drive means has a plurality of coils supplied in parallel with an electric drive current pulsed at a drive frequency from one or more drive circuits.
A recessive driver circuit (238) draws a drive current from the stored energy output (236) and couples the drive current to the serial bus (232).
The first modulating current and the bias current form a drive current to drive the laser.
Then, the light emitting element driving section (5) drives a light emitting element (1) by using the driving current.
A light emitting element driving section (5) produces a driving current obtained by combining together a signal amplitude current according to the amplitude of the digital signal (S) and the peaking current.
The piezoelectric actuator (P) is charged or discharged by the control current (IST) via the control unit (D/A, AE).
If a change in the actuating current is detected, it is assumed that the opening time has been reached.
The reduction of the magnetic energy stored in the excitation coil becomes slow.
In a second step, the excitation current is increased further, preferably at a rate of change of the excitation current which is reduced in comparison with the previous fast increase.
Said control current (IST) is configured in such a way that in a frequency response of the control current (IST) 99 % of the amplitude portions lie below a predetermined limiting frequency (fg).
The switching control signal is generated based on comparing an instantaneous sample of the excitation current with a threshold current reference and/or at least one preceding sample of the excitation current.
The excitation current flowing through the excitation winding is influenced and optionally reduced by the control device such that the maximum current output does not exceed an output current upper limit.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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