All commercial motors have even-numbered stator poles.
Some three-phase motors have a combination of different stator poles, and different rotor poles, such as 6-12 or 4-6.
Some two-phase motors, or one phase motor, as sometime designated by Engineers, have equal number of stator poles and magnet poles.
But commercial machines, produced in large quantities always have even-numbered stator poles.
The present invention has an un-usual and un-common odd-numbered stator poles in the motor
The odd-numbered motor stator is combined, in the same structure, with a generator, both rotating on a common shaft
This is a combination motor-generator, that could be written up as:
a normal powered stator pulse
casing rotor motion,
followed by a non-powered magnet repulsion step,
wherein the repulsion also generates power
out of phase with the normal power pulses.
This is a combination motor-generator, which also could be described as: a Gerfast motor-generator wherein rotor rotation is accomplished,
as a first step, by a power pulse into the stator, rotor motion, and secondly, by a stator magnet repelling a rotor magnet, thereby taking a second step, which is non-powered, and continuing these two sequences.
It could also be described as:
A combination motor-generator comprising:
a motor stator with odd-numbered wound-coil poles,
Further description of the present invention.
This is a combination motor-generator, that could be described as:
This unique motor generator combination has an odd-numbered stator with windings, and an additional permanent magnet pole, in a round shaped stator lamination. Lamination alternative such as Gerfast's “Linear series of open jaw coil winding slots”, application Ser. No. 15/999,941 is an excellent lamination. The rotor in this motorgenerator is a common deign with alternate north and south magnets used in many brushless motors today. The permanent magnet pole, such as a south pole, automatically attracts, and lines up with a north pole on the rotor, whenever the power is shut off. This condition provides for an automatic “start position” at all the occasions when the motor is turned off. This automatic start position allows for a SINGLE semiconductor to send a power drive pulse into the odd-numbered stator coils to make the rotor take one step, and repeat, to drive this unique motor generator continuously. The rotor is journaled to run in close relation to the stator. The timing of the drive pulse is done with a sensor. This unique design could be described as Gerfast's odd-numbered stator for a motor and generator combination, having excellent efficiency and having almost noiseless operation.
The very quiet operation and low power needed for running, is accomplished by 1. The short timing of the power pulse followed by 2. A non-powered motion caused by magnetic attraction by a south pole attracted to a north pole. [This function is also a generator function which can be observed on an oscilloscope during coast down of the rotor]. By the very correct timing of these two operations, augmented by the rotor inertia, and possibly also, by a fan blade inertia, a very smooth operation is accomplished. As an example, this motor generator running with a 5 bladed 10 inch [254 mm] diameter fan blade, at 500 RPM gave an average noise level, measured (Db) to be almost the same as the noise level of a very quiet room.
The short timing pulse created by the single semiconductor and the timing, as with a Hall sensor, can be manufactured by a number of manufacturers, used to doing signal designs.
Individual components are not listed separately, but are common in the industry, and are still becoming part of this invention, as “alternate designs”.
The angular position of this sensor, away from the zero angle between stator poles determines the rotation of the rotor.
As an example, plus 7 degrees equals one direction, and minus 7 degrees equals the other, with other fine adjustments. Most brushless motors, on the market today, has a non-uniform rotation that is generally named “cogging”. This motor generator with the drive pulse, plus a generator pulse, is almost void of any cogging. Further background.
All commercial motors have even-numbered stator poles.
Some three-phase motors have a combination of different stator poles, and different rotor poles, such as 6-12 or 4-6.
Some one-phase motors, have equal number of stator poles and magnet poles. Any commercial machines, produced in large quantities always have even-numbered stator poles.
The present invention has an un-usual and un-common odd-numbered stator poles in the motor. The odd-numbered motor stator is combined, in the same structure, with a permanent magnet pole which does two functions: first, as an “always return to start position” device, and secondarily, as a generating action device when the rotor is running. The generating action, by phase angle, counteracts and minimizes the incoming power pulses, thereby increasing the efficiency of the motor/generator.
All commercial motors have even-numbered stator poles. Some three-phase motors have a combination of different stator poles, and different rotor poles, such as 6-12 or 4-6. Some two-phase motors, or one phase motor, as sometime designated by Engineers, have equal number of stator poles and magnet poles.
But commercial machines, produced in large quantities always have even-numbered stator poles.
The present invention has an un-usual and un-common odd-numbered stator poles in the motor
The odd-numbered motor stator is combined, in the same structure, with a permanent magnet pole which does two functions: first, as an “always return to start position” device, and secondarily, as a generating action device when the rotor is running. The generating action, by phase angle, counteracts and minimizes the incoming power pulses, thereby increasing the efficiency of the motor/generator.
The start position is shown in
The timing of the power pulse is generated by a rotor position sensor such as a magnetic Hall sensor or optical sensor.
2. Is an overview of a motor generator shown how a drive pulse into the multitude of odd-numbered stator poles is creating a south pole in front of the permanent magnetic south pole, thereby repulsing the rotor to move into a position as shown in
The timing of the power pulse is generated by a rotor position sensor such as a magnetic or optical sensor. The angular position of this sensor, away from the zero angle between stator poles determines the rotation of the rotor. As an example plus 7 degrees equals one direction, and minus 7 degrees equals the other, with other fine adjustments.
The rotor 50, with its rotor magnet 40 is shown ready to repel a stator magnet 30. and thereby assume a start position.
located next to the rotor 50, providing magnetic signals from the magnets on the rotating 50, thereby synchronizing the pulses to the power devise 140.
Necessary resistors are shown together with a Zener diode 160. This is only one possible circuit, many modifications can be made without altering the scope of this invention.
the generated signal 200 is showing on a watt-meter as negative watts. This type of generation, when running with a load, such as a fan blade, show this unique motor/generator to have substantially lower power consumption, and therefore higher efficiency.
An assembly of a motor generator is shown in the start position, and is shown in
But of course, in order to have power shaft output, the short power pulse has to be greater than the generator output.
The timing of the power pulse is generated by a rotor position sensor such as a magnetic Hall sensor or optical sensor. Not shown.
And all the 5 windings are shown to be about 95% at 512.
The pole 503 can have an additional winding 514 shown in dash lines. A outside steel rolled iron case, which enhances the magnetics is shown at 516.
Circular holes for rivets 518 are holding the laminations in these figures. The rotor has a centrally located shaft 510.
Both
Circular holes 520 are for mounting screws.
Comparison of brushless motor cost and drive design.
The comparison is based on a very common design of a “Brushless” motor, produced by many manufacturers today. It is assigned a 100% number. The 2 phase design is based on Gerfast's U.S. Pat. No. 6,850,019 “A single coil Brushless motor”, and Gerfast's U.S. Pat. No. 6,940,238, “A Brushless motor with voltage boost”. These two motors are in production in the United States. About 2 million motors have been made, which becomes a good basis for a comparison.
The Gerfast III design is a present patent application Ser. No. 15/999,941. which is a unique type a laminations called “open jaw” laminations, manufactured in a strip form. The open jaw allows for a magnet wire winding, of about 95% “copper fill”, where normal winding of laminations is a maximum of about 56%. In addition the “strip type” saves about 60% of lamination steel or specialty material.