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Tachometer check apparatus

  • US 4,575,664 A
  • Filed: 03/12/1984
  • Issued: 03/11/1986
  • Est. Priority Date: 03/12/1984
  • Status: Expired due to Fees
First Claim
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1. A speed-controlled motor system, comprising:

  • (a) electric motor means with a rotating member for driving a load at a predetermined angular velocity;

    (b) motor controller means interconnected with said electric motor means for causing said rotating member to rotate at said predetermined angular velocity when actuated;

    (c) tachometer means with output voltage terminal means interconnected with said rotating member for generating a tachometer means output voltage at said output voltage terminal means which is indicative of the angular velocity of said rotating member, said tachometer means being interconnected at said output voltage terminal means with said motor controller means for providing said tachometer means output voltage thereto for being utilized by said motor controller means to maintain the angular velocity of said rotating member at said predetermined angular velocity within limits; and

    (d) combination motor control starter and tachometer checker means interconnected with said tachometer means output voltage terminal means and said motor controller means for simultaneously actuating said motor controller means to cause said rotating member to rotate and initiate a tachometer means check to stop said rotating member from continued rotation if a minimum output check voltage value is not present at said output voltage terminal means at a predetermined time after said motor controller means has been actuated, comprising;

    (i) a power supply means;

    (ii) voltage time delay means for providing an output feedback signal at the end of said predetermined time unless sooner disabled at a disable terminal thereof;

    (iii) disable comparator means interconnected at the input thereof with said tachometer means output voltage terminal means and connected at the output thereof within said voltage time delay means for providing a disabling condition for said voltage time delay means when the voltage on said output voltage terminal means exceeds said minimum output check voltage; and

    (iv) switch means connected at one pole thereof between said power supply means and said voltage time delay means and connected at another pole thereof with said motor controller means for simultaneous actuation of said motor controller means and connection of said power supply means to said voltage time delay means so that said output feedback signal will be provided after said predetermined time unless sooner disabled, said disabling occurring if said minimum output check voltage is reached before the end of said predetermined time.

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