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    Control arrangement for motor to establish high speed unregulated operation in one mode and regulated operation in another mode
    2.
    发明授权
    Control arrangement for motor to establish high speed unregulated operation in one mode and regulated operation in another mode 失效
    电机控制装置在一个模式下建立高速无约束操作，并在其他模式下进行调节运行

    公开(公告)号：US3599065A

    公开(公告)日：1971-08-10

    申请号：US3599065D

    申请日：1968-10-15

    Applicant: IBM

    Inventor： FACKLER CHESTER M ,  LENDERKING DAVID H

    IPC: G11B15/46 ,  H02P7/288 ,  H02P5/16

    CPC classification number: H02P7/2885 ,  G11B15/46

    Abstract: The invention concerns motor operating and motor-regulating circuits, particularly set in a dictating and transcribing environment. The circuits insure a fast startup time for the motor whether the conventional AC power source or battery is used. During startup time, the full potential is applied across the motor and at a predetermined speed, the regulating circuit becomes effective to maintain the speed. This action applies during recording and playback operations. During other operations, such as a record media loading and phasing operation and an automatic erase operation, the full power supply is applied across the motor as long as necessary to complete the operation and the regulating circuit remains ineffective. During an automatic recall operation enabling a transcriber to listen to a few previous words of dictated material, connections are made to apply the available potential in an opposite manner across the motor to reverse its direction of rotation and the regulating circuit also remains ineffective. Provision is also made for establishing a relatively high and low speed of operation of the motor to achieve 10 and 20 minute recording times, respectively. The rapid startup time permits a direct coupling of the motor to the driving mechanisms and elimination of an intermediate clutch assembly.

    MOTOR CONTROL SYSTEM
    3.
    发明专利
    MOTOR CONTROL SYSTEM 未知

    公开(公告)号：CA941892A

    公开(公告)日：1974-02-12

    申请号：CA63331

    申请日：1969-09-29

    Applicant: IBM

    Inventor： FACKLER CHESTER M ,  LENDERKING DAVID H

    IPC: G11B15/46 ,  H02P7/288

    Abstract: 1280214 Automatic speed control INTERNATIONAL BUSINESS MACHINES CORP 9 Oct 1969 [15 Oct 1968] 49662/69 Heading G3R An electric motor is controlled by a speed sensing feedback circuit. A manual switch can also be operated to energize the motor directly independent of the feedback circuit. The example described is a dictating and playback system of the type in which a signal is recorded in a helical path on a magnetic belt. The belt is placed in a transcribing unit, for playback by an operator using a foot control switch. The regulating circuit for the transcribing unit is shown in Fig. 7, details of the circuit and associated switches being given in Figs. 5a and 5b (not shown) The unit is driven by a D.C. motor 105a in series with an amplifier 280 comprising a pair of Darlington-connected transistors. The motor drives a tachometer 273, the output of which is fed through a limiter 281 and single-shot circuit 282, each comprising a pair of transistors, to produce pulses of fixed duration which are integrated by a filter 283 which acts as a Miller integrator and includes a further transistor. The resulting output is compared with a fixed reference supply and used to control the transistors in amplifier 280. In normal operation, that is, during playback of the belt, the voltage applied to the motor is restricted by the feedback circuit to a about 6 volts. However, when the belt is first loaded, phase switches are operated by the foot control and the motor is connected directly to earth and operates at the full voltage of 16-18 volts independent of the feedback circuit to register the beginning of the belt rapidly. Similarly, the belt is cleared after use by pressing an erase button which drives the belt rapidly for one revolution. Further switches are provided to allow the belt to be stepped in movements in either forward or reverse directions, and after playback the belt is automatically repositioned so that the last few words will be repeated when the belt is next used. The operation of the dictation unit is similar, and the construction of the whole system is described in Specification 1224909.

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