Title:
MOTOR CONTROL DEVICE AND MAGNETIC RECORDING/REPRODUCING DEVICE USING THE MOTOR CONTROL DEVICE
Document Type and Number:
Japanese Patent JP3228800
Kind Code:
B2
Abstract:
PURPOSE: To suppress variant components in DFG signals and stably rotate a motor with accuracy by simple digital processing by providing a filtering means to extract motor rotation cycle components and the like contained in DFG signals.
CONSTITUTION: The control device is a motor speed control device using frequency signals (DFG signals) in proportion to the drum rotation speed. The filter in the speed control signal generation system is a feedback type comb filter; the feedback system is provided with the following two characteristics: one wherein the transmittance G1 (Z) satisfies Formula I, and the other wherein the transmittance G2 (Z) satisfies Formula II. In Formulae I and II, K1 and K2 are real numbers with K1<1 and K2<1, and N and M are integers with N>2 and N>M. A DFG sensor 4 detects DFG signals through the rotation of the drum 2. A cycle comparison circuit 10 compares DFG cycle data with data from a target cycle generation circuit 9, and produces speed error signals. Variant components are extracted and removed from DFG signals by a variant component extracting removing filter 11.
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Inventors:
Koji Kaniwa
Akifumi Sanbe
Hiroya Abe
Yukinobu Tada
Yoshio Narita
Akifumi Sanbe
Hiroya Abe
Yukinobu Tada
Yoshio Narita
Application Number:
JP30130692A
Publication Date:
November 12, 2001
Filing Date:
November 11, 1992
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G11B15/467; G11B15/473; H02P25/098; H02P29/00; (IPC1-7): H02P5/00; G11B15/473
Domestic Patent References:
| JP4248395A | ||||
| JP4120609A | ||||
| JP382384A | ||||
| JP471378A | ||||
| JP4255486A |
Attorney, Agent or Firm:
Kiyoshi Maruyama (6 others)