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Low peak to peak current of a dual motor design Disclosure Number: IPCOM000236747D
Publication Date: 2014-May-14
Document File: 2 page(s) / 50K

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Disclosed is a Low peak to peak current of a dual motor design.

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This is the abbreviated version, containing approximately 78% of the total text.

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Low peak to peak current of a dual motor design

In this disclosure, reducing the peak to peak current to generate from two rotors is proposed.

The purpose is to reduce peak to peak current on dual motors. Generally, there are two independent MCUs which control different brushless DC motors. The energized current is synchronized to the MOSFETs switching frequency. Since these two MCUs are working independently the peak to peak current will be increasing and decreasing periodically. The peak to peak current will be at maximum "least common multiple number" of these two periods.

We provide a dual motor topology to reduce the peak to peak current. We implement a "proper delay" of control signal, and then send the control signal to the second motor. By separating the energized current of theses two motors to 180 degree, it would reduce peak to peak current.

Briefing discussion for existing fan module design:

We are using redundant motor controllers combined into a module in current dual motor design.

The current pulse (refer to page 5) of controller I and controller II are not always the same and the phase of the current might be in-phase or in opposite-phase.


Cause the peak to peak of total current increase very much (maximum x2 when opposite-phase occurred ). OCP will be occurred if x2 current exceed rated output current.

Larger peak to peak current might introduce more stress to power supply and stability of output voltage level.

Propose Low Peak to Peak des...