DE1797838U - EQUIPMENT FORMING A MOTOR AND LOW VOLTAGE TRANSFORMER, IN PARTICULAR FOR KINEMATOGRAPHIC PROJECTORS. - Google Patents

Description

Device that includes a motor and a low voltage transformer forms, especially for cinematographic projectors.

The present innovation relates to a device that simultaneously forms a motor and a powerful (power-emitting) transformer for low voltage (transformateur de puissance a basse tension), in particular for driving the projectors for cinematographic films of reduced format or small format and for the supply (delivery of power current for) the light bulb (or other light source) of such projectors; the innovation is also more generally applicable to all those apparatuses or installations in which a motor with low power is simultaneously power and a feed (delivery of greater power 2 u cm or power currents) higher power or relative significant leisuu with such tension which is smaller than that of the motor voltage supply network (the voltage of the supply network for the motor, motor voltage).

We know that two solutions are common to small cinematographic projectors can be used: u In the first type of solution, the mechanism (kinematics of the projector) is driven by a small motor and the lightbulb (light source), generally one from BS. for 55 volts, is in series miteicesj. '. resistance (ohmic contact resistance) closed, which results in a narrow voltage drop > Z. 2 calls. Rs this results in a loss of energy which is equal to that which is used (consumed) in Jer lightbulb on the one hand, and a freeing (Frci- setscn, ntstci: J from arsie, the total double That is how big it is even from the lightbulb '. Asses, and it is very difficult to manage them if you have a light bulb with a much smaller one Wanted to send voltage, z. B. such with or for 6 to 2 volts, then the heat dissipation and the energy loss act or become prohibitive.

The second type of solution is, on the one hand, one that is powered by the network Motor and, on the other hand, a (special) transformer to power the light bulb to use ; but this solution is, in the same way, of little advantage in terms of the space and space requirements, the weight and the price.

On the other hand, devices are known which are formed by asynchronous motors, the stator winding of which has a tap (tap, pinch) for supplying lighting with low voltage and is suitable for delivering (only) very little power. The device according to the innovation allows the advantages of the above-mentioned types of solutions under avoiding their disadvantages, and with a small motor and a single magnetic circuit Transformer for creating a light source of low voltage and significant power. The device is characterized by the fact that it has a solid peeled magnetic circuit (self-contained magnetically conductive line of force) of rectangular shape, one side of which has the single-phase inductive winding with several inputs or taps and the opposite side, the opposite side, the opposite side has an enlarged cross-sectional area, has a cylindrical opening in which the rotor of the motor is rotatable, the rotor being formed by a laminated core cylinder which has an induction winding, preferably in the form of a cage or short-circuit armature or a cage or short-circuit winding, whereby (for the purpose of building up a rotating motor field) auxiliary phase windings (phase shift windings) are arranged on one side and on the other side of the rotor, namely on the two branches of the magnetic circuit that revolve around the rotor.

Another feature of the establishment is that it is predominantly rectangular Magnetic circuit two inductive windings with several on or. Has taps, which sit on two opposite sides of the rectangle, with a third branch (Middle bar) in the middle of the magnetic circuit parallel to the two (outer) sides is arranged, this middle web or branch containing the rotor Has an opening or a hole.

It is also a feature of the innovation that the magnet current is off peeled transformer sheet (laminated core) several perforations or bores has to accommodate several rotors, whereby the motors can be designed so that they have different powers and different speeds.

According to the preferred embodiment of the innovation is Winding on the magnetic transformer circuit (iron circuit, core or yokes plus Cores) and forms the inductor of the motor (field, alternating or rotating field of the motor), and this is realized in the form of an autotransformer with several taps and with several feeds for the supply (several taps or contacts of the winding for initiation or application the mains voltage or the mains current), for example for 110 volts and 120 volts, and through Provision of one or more output taps (taps der'Wicklung) for low voltage, for example for (decrease of) 6,12,20, or 55 volts for powering the projector light bulb or the like.

An Ausfhrunsbeispiel is shown on the drawing; Fig. 1 shows a side view, FIG. 2 shows a transverse section, FIG. 3 shows a side view a variant.

As can be seen from FIGS. 1 and 2, the device comprises a fixed scrolled magnetic circuit (yokes and cores) 1 in the form of a rectangular frame, one side 2 (core) of which has a winding 3 that is similar or analogous to that of a savings Transformer (auto-transformer) is and several feeds or taps (feed taps for mains current), for example a supply source 4 (feed contact terminal for mains current) of or for 110 volts, a supply source 5 (feed contact for mains current) of or for 220 volts and an output tap 6 (tap) for 55 volts, where tap 7 (contact, tap) corresponds to the return wire (to the network). On or in the side 8 (core) of the iron frame 1, which is opposite the side 2 (core) carrying the winding coil 3, a round opening 9 is provided, in the interior of which the rotor 10 of the motor sits rotatably, which (10) is formed by a peeled cylinder (laminated core rotor), which in turn is mounted on a shaft 11 which is supported in the bearings 12, 12 ′, this rotor 10 is provided with a rotor winding, preferably in Form of a cage armature (short-circuit armature) through the rods 13 (e.g. copper rods). In order for the magnetic induction (the magnetic flux) across the motor to have a suitable strength, the section (surface area) of side 8 (core) of the magnetic circuit is considerably larger (significantly larger) than that (the cross-sectional area) of side 2 ( Kerns), for example twice as large. In the most common case one single-phase device (single-phase network) carry the c L3 two second 8 ', 8 "of side 8 (core) of the magnetic circuit on both sides of the rotor 10 phase shift coils (possibly damping coils) 14'14", which form a field (e.g. build up opposing field or additional field) , which has a quadratic relationship in (with regard to) the time and the space (of the space) with (to) the radial field that crosses the rotor, i.e. in such a way that (by means of the auxiliary phase) the necessary resulting rotating field (for the motor) is created .

The efficiency of the combined transformer-motor unit according to the innovation is similar to that of a (stand-alone) engine and one of them separate transformer; but the weight, the space requirement and the price are similar to a single engine of the same power (i.e. one engine alone without transformer).

According to the device according to FIG. 3, the magnetic Circle a symmetrical shape (double frame); two windings 3.3 ', connected in series, are on the two opposite sides 2.2 '(cores) of the rectangular (double-frame-like) magnetic circuit provided while the opening 9 (hole) in which the Rotor 10 runs, is housed in a central area 15 (central core, Core web), which is parallel to (the cores) 2, 2 ', this embodiment being a Easier adaptation of the magnetic flux across the motor to the power of the motor because part of the flux closes directly on each winding Through the middle area (core, core web) 15 of the (double frame of the) magnetic River.

The scrolled magnetic flux (frame) of the transformer can have several round openings that accommodate several rotors, so that several motors of different powers and speeds are formed. The device according to the invention can except Z, CD cinematographic projectors cover numerous other areas of application, and in particular it can always be used when it is necessary to arrange one or more motors of low power and low voltage supply of relatively significant power, i.e. primarily a supply for lighting, electrical heating and for similar purposes (e.g. to feed motors with low power consumption and additional consumers with higher power consumption).

Claims (3)

Protection claims ===::: =========== 1. Device that has an electric motor and a low-voltage power transformer at the same time, especially for the drive and for Low-voltage light bulb supply or low- voltage light source supply of cinematographic Small format Filu projectors, thereby geken n- draws that the device has a fixed scrolled magnetic circuit (self-contained magnetically conductive line of force) of rectangular shape, one side of which has the single-phase inducing winding with several turns btw. Has taps and the opposite side, which has an enlarged cross-sectional area compared to the first-mentioned side, has a cylindrical opening in which the rotor of the motor is rotatable, the rotor being formed by a laminated core cylinder with an induction winding, preferably in the form of a cage or Kufzschlussanker or a cage or short-circuit winding, with (for the purpose of building an otur rotating field) auxiliary phase windings (phase shift windings) are arranged on one and the other side of the rotor, namely on the two branches of the magnetic circuit surrounding the rotor . 2. Device according to claim 1, characterized in that the primarily rectangular magnetic circuit has two inducing windings with several To or. Has taps on two opposite lying sides of the rectangle sit, with a third branch (center bar) is arranged in the middle of the magnetic circuit parallel to the two (outer) sides, this center bar or branch having the opening or hole containing the rotor. 3. Device according to Claims 1 and 2, characterized in that that the magnetic current from the leafed transformer sheet (laminated core) has several openings or has bores to accommodate multiple rotors, the motors being so designed may be that they have different powers and different speeds.