Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1989-04-12
1991-08-20
Smith, Jr., David
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, H02P 506, H02K 2908
Patent
active
050417681
ABSTRACT:
In a three phase full wave type brushless DC motor control system, the neutral (common) terminal (15) is connected to the positive terminal (14A) of a battery (14) with the negative battery terminal (14B) connected to ground comprising a reference terminal (27) for the control system. Pairs of upper and lower controllable switching drive devices (21A-22A, 23B-24B, 25C-26C) are utilized to control current in windings (13A-13C) of the motor (13). Diodes (29-34) are connected across each of the switching devices for handling inductive transient signals. An effective storage capacitor, preferably comprising individual storage capacitors (36-38) connected across each pair of switching devices, is used to store a boost voltage, above battery voltage, which is generated by inductive transient signals. This configuration not only returns inductive energy in the windings to the battery and/or other windings in the motor, but also substantially reduces radiated noise and conducted noise and therefore provides less battery voltage ripple.
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"Switched Reluctance Motor Drives", by T. J. E. Miller, Oct. 1988, pp. 319 through 327, 338 through 341.
"DC Motors Speed Control Servo Systems Handbook", by Electro-Craft Corporation, 1975, pp. 6-1 to 6-17.
"Motorola Linear and Interface Integrated Circuits", 1988, pp. 4-34 to 4-53.
Motorola Technical Data Sheet for MPT1ON1OM Power Field Effect Transistor, 1986, pp. 1 through 6.
Melamed Phillip H.
Motorola Inc.
Smith Jr. David
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