Abstract: A method for the detection and regulation of a spring moment and a difference speed in rotationally driven systems in which a drive unit can be viewed as an elastically coupled two-mass system. The spring moment and the difference speed are determined without direct measurement of the actual load speed or the load position. This is done by comparison of the actual motor speed influenced by the spring moment and a simulated actual motor speed. The resulting difference speed and spring moment are directly proportional to the actual difference speed and the actual spring moment and can be supplied to the regulating system of the motor for regulating the intrinsic oscillations of the system.

Abstract: The present invention is directed to a motor rotation speed controlling apparatus including a comparator, a detecting circuit for detecting a feedback signal of a motor, a motor driving transistor, and a circuit for changing the level of a constant voltage fed to the comparator. The comparator compares a saw-tooth voltage with a constant voltage and outputs a signal which has a duty cycle corresponding to the result of the comparison. The motor driving transistor drives the motor in response to the output signal from the comparator. To change the duty cycle of the output signal from the comparator, a circuit is used that changes the level of the constant voltage in response to a feedback signal detected by the detecting circuit.

Abstract: A magnetic or optical disk apparatus featuring a circuit for generating a dual implication MOTOR STATUS signal in response to a MOTOR SPEED signal representative of the speed of rotation of a disk drive motor and to a MOTOR ON signal dictating the rotation and nonrotation of the disk drive motor. The MOTOR STATUS signal indicates: (1) the rotation of the disk drive motor at a desired normal speed, enabling data transfer between the disk and a head; and (2) the slowing down of the motor to a predetermined speed close to zero. The two implications of the MOTOR STATUS signal can be distinguished from each other by reference to the MOTOR ON signal. The first implication may be used to enable reading or writing of data on the disk, and the second implication for disk ejection and for opening a power switch or switches, among other purposes.

Abstract: A speed control device for an electric motor having a rotation speed and driven by a power source and including components for producing a counter value from the rotation speed of the motor, components for comparing the counter value produced from the producing components with a predetermined counter value of a designated speed and producing a deviation output counter value, components for integrating the deviation output for a predetermined period of time including a first integrating circuit for multiplying the deviation output by a predetermined value and producing a resultant and a second integrating circuit for adding a predetermined value to the resultant of the first integrating circuit and producing a resultant, and components for adding said second integrating circuit resultant to the deviation output of the comparator means so as to change the deviation output resultant counter value to a time value for controlling the motor driving power source.

Abstract: A method and means for producing a control voltage for controlling a direct current motor makes use of a tachometer voltage providing two ninety degree phase shifted tachometer signals. From these are derived four coding signals comprising the tachometer signals and their inverse signals. The four signals are combined to produce a triangular signal, which is differentiated. The differentiated signal and its inverse are applied through a switching circuit to produce a control signal.

Abstract: A delay circuit is realized by a program, instead of a conventional one of a hard system, so that if a pedal controller is rapidly stepped, a suitable speed acceleration or reduction curve may be always provided and the delay circuit is not affected by changes in temperatures or variations in passing time.

Abstract: A circuit for controlling the speed of a DC motor provides delay and sampling means in the feedback loop to delay the triggering of the SCRs driving the DC motor and measured the motor armature voltage during the period of the delay, thereby eliminating errors in the armature motor voltage caused by the SCR motor excitation.Alternatively, the current to the motor is measured to generate a pulse output for initiating an interval during which the measured armature voltage is sampled and transmitted to a summator for generating an error signal controlling application of power to the DC motor whereupon the aforesaid interval is terminated upon receiving a pulse indicative of power application to the DC motor.

Abstract: A current limiting control circuit for a d.c. motor, wherein compensation is provided for the inherent voltage drop across the armature of the d.c. motor with a first dedicated amplifier, while a second dedicated amplifier provides current limit control. In providing a separate and dedicated amplifier for the current limiting function, the limitations inherent in the current/resistance compensation circuit, such as lag in response time, are avoided.

Abstract: A motor drive circuit fo driving a reversible motor selectively in a forward or reverse direction comprises a main switch for connecting electrically the motor drive circuit to a power supply source, auxiliary switch circuitry for determining a current path along which a current is to be supplied from the power supply source to the reversible motor and duration in which the current is supplied to the motor, current supply control circuitry for detecting the current path determined by the auxiliary switch circuitry and causing the current to flow along the determined electric path, hold circuitry for holding the operating state of the current supply control circuitry, oscillation circuitry operable in response to the operation of the main switch establishing the connection to the power supply source to supply a reset signal to the hold circuitry and cause the current supply control circuitry to perform current detecting operation through the hold circuit, and current interrupting circuitry for breaking the con

Abstract: A speed control device for d-c motors includes an IC control circuit having such a construction that a reference voltage is generated across two of its terminals C and D. Additionally, a current proportional to the armature current of the d-c motor is kept flowing in the terminal D at all times. A transistor is connected across the terminals C and D of the control circuit so that motor revolution can be changed linearly by means of a variable resistor connected in parallel across the base and collector of the transistor. With this arrangement, the revolution of d-c motors can be accurately controlled.