Low consumption electric motor and DC generator


Low consumption electric motor and DC generator
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Low consumption motor and DC Generator

FIRST question probably it will be why ? Because I have a strange hobby and I wish to see if it is possible to light a led 6 V - 12 V from a scanner lamp using as input power a VIMUN mini solar panel (inside office calculator) exposed  in artificial light  - input power : 1.25 V X  0.054 ma

SECOND question probably it will be ok......why don't you use a converter ( step up booster/transformer) increasing voltage - because there's hardly any power at all from that panel , trying to increase it's voltage means you reduce it's current (plus losses as well ), as it stands the solar panel can't generate enough power to start the converter

I will start with the begining :

Objective : to build an electric motor operated under low power (voltage and current) , powered by a single small solar panel which can operate in the artificial light and which can be transformed in a small electric dc generator.

VIDEO 1. : TEST 1 "Low consumption motor"


Neodymium sphere 19 mm diameter - the key component

Material NdFeB Shape, Sphere Diameter 19 mm Tolerance +/- 0,1 mm, Coating Chrome-plated (Ni-Cu-Ni-Cr), Manufacturing method sintered Magnetisation N38 Strength approx. 4,9 kg (approx. 48,1 N), Max. working temperature 80°C, Weight 27,2943 g, Curie temperature 310 °C, Residual magnetism Br 12200-12600 G, 1.22-1.26 T, Coercive field strength bHc 10.8-11.5 kOe, 860-915 kA/m, Coercive field strength iHc ≥12 kOe, ≥955 kA/m, Energy product (BxH)max 36-38 MGOe, 287-303 kJ/m³ 19 mm , Pollutant-free according to RoHS Directive 2011/65/EU._

Important : the metal cases with screws should be positioned : one to the N magnetic pole of the neodymium sphere 19 mm diameter and the second one on the S magnetic pole of the sphere. ( In the presented Video 1. , at the first test, the metal cases weren't properly placed on the sphere and the motor doesn't reached the full speed )

In the upper side of the sphere there is no friction between the screw and the iron - see the TEST 2

VIDEO 2. : low consumption motor TEST 2


Input DC power - mini solar panel -VIMUN SC-3012-2A, 29.44mm×11.6mm×1.1mm, 4 cells

There are a total of four electrical components. A small solar panel ( VIMUN SC-3012-2A, 29.44mm×11.6mm×1.1mm, 4 cells. The following specifications were listed, 2.0 Vos, 9.0 UAsc, 1.5 Vop, at 200Lux), a 470 uF 10 V electrolytic capacitor, a coil iron less with thin copper wire and a small circuit board with a black blob on it.


Low consumption motor using neodymium sphere 30 mm diameter weight 110 g


Under this blob is the integrated circuit chip. It provides the correctly timed pulses to the coil and magnet combination. The integrated circuit is more or less just a low frequency oscillator which runs at approximately 1 Hz most likely driving an open drain NMOS switch ( output on pin 3 ) which periodically connects the coil to the - terminal. The circuit pulses the 18 mH coil causing the neodymium sphere magnet spinning.

electrical components used (excepting the coil iron less ) - from a solar powered flapping toy.

DC generator. Sphere generator.

image description
The presented low voltage electric motor can be transformed in a DC generator by adding a second coil iron - less, a rectifier (Ac to DC) and a led  :

The rectifier used in this test can be found in a old phone charger.

IMPORTANT NOTE : if you will connect directly the led to the solar panel, the led will NOT light , due to the low voltage output of the solar panel.

The second coil used can be found in a synchronous motor 230 V (microwave turntable motor)

Important :

without using the rectifier (AC to DC ) results AC voltage.

VIDEO 3. : TEST 1 DC GENERATOR. " Sphere generator" - DC voltage


In the presented video the "led " is from a printer scanner light (DC voltage).




Re: Low consumption electric motor and DC generator
« Reply #2,  »Last edited
yes, it is from a solar toy, excepting the coil iron -less and the neodymium sphere.
Thx for the link, very descriptive.

as an example (refering to electronic circuit )  :