Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-03-10
1987-12-15
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310162, 310257, H02K 3700
Patent
active
047135654
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the single-phased motor with a magnetized rotor. There exists different types of motors with a magnetized rotor.
Moreover, there exists different motors of the same type as that according to the present invention. By same type, one understands that the motor comprises a rotor, whose magnetization axes are parallel to the axis of rotation of the rotor. However, the existing motors of this type have shortcomings due to the design of their structure, which reduce in particular their yield. That will clearly appear hereinafter on the basis of the equivalent diagram of the motor according to the present invention.
The invention has for its object the design an electric motor having an optimum yield in a given space while using existing materials and being capable of being fabricated by industrial procedures.
Another object of the invention is to design a motor whose power range can be quite extensive without changing the design of the motor.
Another object of the invention is to design a motor whose number of steps per revolution can be very large without altering the design of the motor.
It will appear that the structure of the motor according to the invention can be adapted either to a step-by-step mode of operation or to a continuous one, usually called synchronous.
With a step-by-step mode of operation, in a space reduced to 8.times.8.times.2 mm and by using for the rotor a material such as samarium-cobalt of 20 MGOe and while being industrially manufacturable in great series, the motor according to the invention has a yield of about 50%. The yield is even higher when the space is more important, the materials used more performing and the manufacturing tolerances narrower.
The power typically can be of 100 .mu.W for the lower powers and can reach much higher powers without modifying the design of the motor.
The application field of the motor according to the present invention is thus very extensive.
Medical instruments, including systems that can be incorporated into the human body, drive systems for the aeronautical and spatial industries, office automation, robotics, photographic equipment, timekeepers, etc., can employ the motor of the present invention.
More generally, the motor according to the present invention, when operating in the step-by-step mode, is adapted to all systems employing a digital technique and, more particularly, to all systems when space, yield and power criteria are a determining factor.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a simplified top plan view of the motor according to the invention.
FIGS. 2A, 2B and 2C show a simplified exploded view of the motor illustrating its structure.
FIG. 3 shows a simplified lateral sectional view of the motor illustrating the positioning principle of the motor.
FIG. 4 shows a simplified sectional view of the motor illustrating the mounting principle of the motor.
FIG. 5 shows the asymmetry of a pole of a polar piece.
FIG. 6 is a linear unwinding of the motor illustrating its mode of operation.
FIGS. 7a, 7b and 7c show the behavior of the positioning and mutual torques as well as the voltage surges to be applied to the coil when the motor is adapted to the bipolar step-by-step mode of operation.
FIGS. 8a and 8b show the behavior of the positioning and mutual torques as well as the voltage surges to be applied to the coil when the motor is adapted to the unipolar step-by-step mode of operation.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The drawings show by way of example the motor according to the invention with a rotor having a number of pairs of poles equal to 8 (N=8).
For the understanding of the structure of the motor according to the invention, particular reference to FIGS. 2A, 2B and 2C will advantageously be made.
This figure is a simplified exploded top plan view of the motor, which clearly illustrates the motor structure.
The rotor 1 is of ferromagnetic material with a high coercive field and a small volumetric mass such as samarium-cobalt. It has N pairs of poles 1p whose axes of magnetization are pa
REFERENCES:
patent: 3845335 (1974-10-01), Oguey
patent: 3989967 (1976-11-01), Kikuyamo
patent: 4207483 (1980-06-01), Baer
patent: 4217509 (1980-08-01), Sadler
patent: 4629924 (1986-12-01), Grosjean
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