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**OPTIMAL VALUES OF PPM PARAMETER H**

The optimal value Ho of PPM parameter H for the given phase number m was found by the authors of this paper. When the equation H=Ho is obtained, both the drive system mass-and-overall dimensions decrease and its reliability (i.e. fault tolerance) increase are achieved.

The value Ho is determined as follows:

1) Ho=[Ah] if {Ah}<=0.5;

2) Ho=[Ah+1.0] if {Ah}>0.5,

where

Ah=[(Ka^2+4*Ka*Hm)-Ka]/2

or

Ah=-[(Ka^2+4*Ka*Hm)+Ka]/2,

where [Ah] is the integer part of the number Ah, {Ah} is the fractional part of the number Ah, Hm is the maximal value of parameter H for the given value of phase number m, Hm =[Dm], [Dm] is the integer part of the number Dm=m/3.

The parameter Ka shows in how many times the decrease in drive mass-and-overall dimensions is more important than the increase of its survivability for the drive system developer (i.e. the parameter Ka establishes the compromise between the above-mentioned mass-and-overall dimensions decrease and the linear drive survivability increase).

The values of the parameter Ho are given in [1-3] for 2<=Hm<=10 and some set of the parameter Ka values.

For example, at the previous design stage the developer has chosen value of phase number m=30 (in this case Hm=30/3=10). If he has taken an interest in both the motor mass-and-overall dimensions minimization and its survivability enlargement to the same extent, he chooses the value Ka=1.0. It follows from Table 3 that in this case the value of the parameter Ho=3.

In a number of cases (for example, in the field of oil deep-well pumps) it is especially important to obtain at once the linear drive mass-and-overall dimensions decrease and its survivability enlargement.

REFERENCES:

1. Brazhnikov A.V., and Belozerov I.R., "Over-Phase Control of Inverter Multiphase AC Linear Drives", Proceedings of 8th International Symposium on Linear Drives for Industry Applications LDIA‘2011, Eindhoven University of Technology, Eindhoven, the Netherlands, July 3-6, 2011, CD-ROM, paper No 172, 6 p.

2. Brazhnikov A.V., and Belozerov I.R., "Non-Traditional Control and Advantages of Multiphase AC Inverter Drives", Proceedings of IEEE International Conference on Energy, Automation and Signal "ICEAS ‘2011", Bhubaneswar, Orissa, India, December 28-30, 2011, pp. 781-786.

3. Brazhnikov A.V., and Belozerov I.R., "Over-Phase Control of Inverter Multiphase AC Linear Drives", Journal "Mechatronics", Elsevier Publishing Company, DOI 10.1016/j.mechatronics.2012.02.003 (Corrected Proof, Available online since March 5, 2012), in press.

**ОПУБЛИКОВАНО**

Brazhnikov A.V. OPTIMAL VALUES OF PPM PARAMETER H. // Современные проблемы науки и образования - 2012.-№6. (приложение "Технические науки"). - C. **24**