Dual motor arrangement and control method

Details Dual motor arrangement and control method Dual motor arrangement and control method

2007-07-24

2007-07-24

Ip, Paul (Department: 2837)

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

C318S034000, C388S804000

Reexamination Certificate

active

11339213

ABSTRACT:
A dual motor arrangement includes a first motor M1, a first MOSFET Q1constructed and arranged to control operation of the first motor, a second motor M2, a second MOSFET Q2constructed and arranged to control operation of the second motor, an RFI filter structure L1, C_RFI, a freewheeling circuit L2, C2, and a controller S. The controller is constructed and arranged to provide a first PWM signal to the first MOSFET and a second PWM signal to the second MOSFET. The second PWM signal is in staggered time relation with respect to the first PWM signal. When one motor is in a freewheeling mode of operation for at least a portion of a time that the MOSFET, associated with the other motor, is on, freewheeling of the one motor decreases an amount of current drawn by the other motor during turn on of the other motor. The inductors L1, L2can be coupled to define a transformer.

REFERENCES:
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patent: 6836092 (2004-12-01), Sivertsen
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patent: 2003/0034808 (2003-02-01), Roder et al.
patent: 2003/0117093 (2003-06-01), Makaran et al.
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patent: 2005/0074229 (2005-04-01), Herke
patent: 2006/0175992 (2006-08-01), Makaran

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