Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1996-10-18
1999-06-15
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318718, 318719, H02P 146
Patent
active
059125438
ABSTRACT:
Electronic circuit having a digital controller operation of a synchronous motor.
Precision motors for driving, for example, a video head drum in video recorders are normally designed as externally commutated synchronous motors. These motors are driven with square-wave voltages by a digital controller (CON), whose circuitry can easily be implemented.
The object of the present invention is to specify an electronic circuit of the type mentioned initially for controlling a synchronous motor, which enables good synchronism and the motor to be operated with little electrical noise.
This object is achieved in that the synchronous motor is driven by sinusoidal signals, a separate control signal from the controller (CON) influencing the amplitudes of the drive signals (U1, V1, W1). A regulating signal for regulating the synchronous motor is produced by a sensor (GE) which is arranged on the synchronous motor, which regulating signal produces a fixed phase relationship between rotor revolution and drive signals. The circuit can be implemented in a simple manner and manages without any digital/analogue converters.
The applications which result are, in particular, for digital video recorders and for camcorders.
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patent: 5319290 (1994-06-01), Yoshino et al.
Lehmann, R. Technik burstenloser Servoantriebe. In: Electronik 21/13. 10 1989, S. 96-100; Firmenschrift: Siemens, Best.nr E 6430/1003 In: Sonderdruck aus Fernseh-und Kino-Technik, 26, 1972, H.9, S. 326-331.
Copy of Search Report.
S.A. Schweid, et al., "Pulse-width Modulation Control of Brushless Motors," Xerox Disclosure Journal, vol. 16, No. 3, May/Jun. 1990, p. 155.
EPO Search Report for counterpart EPO application number 96117798.7.
Mahr Peter
Reiner Gerhard
Deutsche Thomson-Brandt GmbH
Lockett Kim
Shoop Jr. William M.
Sragow Daniel E.
Tripoli Joseph S.
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