Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1987-02-26
1988-06-07
Ro, Bentsu
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318293, 318440, H02P 700
Patent
active
047499222
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a control circuit for an electric motor whose rotational direction and rate of rotation are controlled by a control signal whereby the rotational direction is controlled upon exceeding or falling below a predetermined level of the control signal, and the rate of rotation is controlled by the pulse-width modulation of the control signal. Such a circuit arrangement, which generates a bidirectional pulse signal to two outputs as a function of the amplitude and the polarity of an analog input signal, is known from the company publication: "Voltage Regulators with Applications", pages 111 to 118, Astronic, Winzererstrasse 47d, 8000 Munich 40, 1982. This circuit arrangement is offered in the form of an integrated circuit. It is used in servo systems which are controlled by electric motors and for controlling the rate of rotation of electric motors. The integrated switching circuit contains a delta connected voltage generator, a control circuit for the delta voltage generator and two comparators. The pulse width modulation is effected by adding the delta voltage and the analog control signal and subsequently comparing the resulting signal with an upper and lower threshold with the aid of the two comparators. There is always a linear relationship between the analog control signal and the pulse width.
ADVANTAGES OF THE INVENTION
In contrast, the control circuit, according to the invention, with the characterizing features of claim 1 has the advantage that a pulse width modulation is effected with a simpler circuit, wherein a nonlinear relationship can be predetermined between the analog control signal and the pulse width.
The control circuit contains few constructional elements and therefore makes possible a construction in series production at low cost. It is particularly suitable for adapting the mean adjusting rate of an actuating motor to the level of the analog control signal, which, for example, can be a command variable or the control deviation signal of an actuating control. Within the range of small deviations between the actual and desired values of the rate of rotation of the motor, the nonlinearity offers the advantage of a more rapid elimination of the deviation without the risk of overshooting the desired value.
Other details and advantageous developments of the control circuit, according to the invention, follow from the subclaims in connection with the following description.
DRAWING
FIG. 1 shows a wiring diagram of the control circuit, according to the invention;
FIGS. 2 to 4 show the dependence of the control voltage Ue on an internal signal voltage Ui.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
In the wiring diagram (FIG. 1) of the control circuit, a control signal Ue arrives at an input terminal 10 and then at a junction 12 via a resistor 11. The non-inverting input of a first operational amplifier 13 and the inverting input of a second operational amplifier 14 are connected at the junction 12. The signal of a rectangular wave generator 15 is connected to the junction 12 via a capacitor 16. Moreover, the junction 12 is connected with a circuit ground 18 via a resistor 17. The inverting input of the first operational amplifier 13 is connected with a supply voltage of the control circuit at the connection 20 via a resistor 19 and the non-inverting input of the second operational amplifier 14 is connected with the circuit ground 18 via a resistor 21. A resistor 22 is located between the inverting input of the first operational amplifier 13 and the non-inverting input of the second operational amplifier 14. An electric motor 25 is connected between the output 23 of the first operational amplifier 13 and the output 24 of the second operational amplifier 14. The positive pole of a first voltage source 26 is connected to the first operational amplifier 13 and its negative pole is connected to the circuit ground 18. A second voltage source 27 has its negative pole connected to the second operational amplifier 14 and its positive pole connected to the circuit groun
REFERENCES:
patent: 3694721 (1972-09-01), Henry
patent: 3976925 (1976-08-01), Rudich
patent: 3989992 (1976-11-01), Schmidt
patent: 4471280 (1984-09-01), Stack
patent: 4514666 (1985-04-01), Suzuki
Hoppe Willy
Steinmann Helmut
Ro Bentsu
Robert & Bosch GmbH
Striker Michael J.
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