Apparatus for controlling an electric motor

39 Pages·2013·2.72 MB·English

United States Patent [191
[11] 4,346,434
Morinaga [45] Aug. 24, 1982
[54] APPARATUS FOR CONTROLLING AN tric motor, which comprises a plurality of detectors for
ELECTRIC MOTOR detecting the operating conditions of an electric motor,
[75] Inventor: Shigeki Morinaga, Hitachi, Japan a digital computing circuit for digitally operating on the
detection signals from the detectors to produce various
[73] Assignee: Hitachi, Ltd., Tokyo, Japan
digital control amounts, reference register groups for
[21] Appl. NOJ 131,483 storing the various digital control amounts or predeter
mined values as reference data, an instantaneous register
[22] Filed: Mar. 18, 1980
group for storing a plurality of instantaneous data indic
[30] Foreign Application Priority Data ative of the instantaneous operating conditions of the
electric motor, a comparison circuit for comparing the
Mar. 20, 1979 [JP] Japan ...... ........................ .. 5432571
corresponding reference and instantaneous data for
[51] Int. 01.3 ....................... .. G06F 15/46; H02P 5/06 each stage, a circuit for storing the comparison result
[52] us. 01. .................................. .. 364/183; 318/341; from the comparison circuit, an incrementer/decre
318/345 E; 364/174; 364/400
menter for increasing or decreasing the instantaneous
[58] Field Of Search ............. .. 364/110, 107, 118,400, data by a unit value for each stage, and a stage counter
364/130, 167, 174, 183, 140, 400; 318/341, 345
for enabling the comparison circuit to compare the
E, 310, 327, 329, 696, 599
various reference data with the corresponding instanta
[56] References Cited neous data in a time-divisional manner, whereby the
comparison circuit and the incrementer/decrementer
U.S. PATENT DOCUMENTS
are used in common for the various data, thereby to
4,090,115 5/1978 Franz, Jr. ................. .. 318/345 E X ensure accurate speed control of an electric motor and
4,090,116 5/1978 Lippitt .................. .. 364/118 X the production of the output pulses required for con
4,153,863 5/1979 Schachte et al. .. 318/341
trolling the motor in accordance with the operating
4,218,735 8/1980 McCutcheon .................... .. 364/118
conditions of the motor by means of a relatively simple
Primary Examiner-Joseph F. Ruggiero circuitry.
Attorney, Agent, or Firm-Craig and Antonelli
[57] ABSTRACT
There is disclosed an apparatus for controlling an elec 60 Claims, 31 Drawing Figures
GATE DRIVER
I27
MULTI
PLEXER
/
:OJTPUT CIRCUIT
St INTERFACE
US. Patent Aug. 24, 1982 Sheet 1 of 17 4,346,434
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GATE DRIVER
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AMPLIFIER A/D
MULTI A/D
AMPLIFIER PLEXER PULSE =
INPUT F’V
AMPLIFIER DISCRETE _ INPUT/ PW
EOUTPUT CIRCUIT
I34 28
I25 =
St I23 I NTERFACE
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US. Patent Aug. 24, 1982 ' Sheet2of17 4,346,434 4
FIG. 4
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US. Patent Aug. 24, 1982 Sheet 3 0f 17 4,346,434
GATE DRIVE
AMPLIFIER
I22 I27 ‘
AMPLIFIER A/ D
MULTI- A/D
AMPLIFIER
PLEXER
DISCRETE INPUT/ I28
{OUTPUT CIRCUIT
5t INTERFACE

US. Patent Aug. 24, 1982 Sheet 5 of 17 4,346,434
U.S. Patent Aug. 24, 1982 Sheet 6 of 17 4,346,434
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US. Patent 4,346,434
Aug. 24, 1982 ‘ Sheet 7 of 17
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550 ’ STATUS BIT MASK BIT ~552
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US. Patent Aug. 24, 1982
Sheet 8 of 17 4,346,434
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