GB1558686A - Electric motors - Google Patents
Electric motors Download PDFInfo
- Publication number
- GB1558686A GB1558686A GB4989677A GB4989677A GB1558686A GB 1558686 A GB1558686 A GB 1558686A GB 4989677 A GB4989677 A GB 4989677A GB 4989677 A GB4989677 A GB 4989677A GB 1558686 A GB1558686 A GB 1558686A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric motor
- winding
- electric motors
- windings
- stator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
Description
(54) IMPROVEMENTS IN AND RELATING TO
ELECTRIC MOTORS
(71) We, THE METTOY COMPANY
LIMITED, a British company of 14 Harlestone
Road, Northampton NN5 7AF do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed to be particularly described in and by the following statement:- The present invention relates to improvements in and relating to electric motors and more particularly to an improvement in or modification of the electric motor disclosed in our Patent No. 1,434,192.
Our Patent No. 1,434,192 claims an electric motor comprising a rotor including a ring formed of magnetic material bonded by a plastic material and permanently magnetised to provide a number of magnetic poles of alternately opposite polarity, -a stator comprising two plates of magnetic material containing therebetween a coil, each plate having one edge provided with fingers forming stator pole faces, the fingers of the plates being angularly displaced whereby, when the coil is energised, stator poles of alternately opposite polarity are produced which cooperate with the magnetic poles of the rotor to drive the rotor, means arranged to respond to the poles of the rotor during rotation to derive an electrical signal which varies in accordance with the position of the rotor, and means responsive to said signal for controlling energisation of said coil and hence the rotation of the rotor.
In particular, there is disclosed a single stator winding energised from a centretapped power source and also, a centretapped stator winding is disclosed. While these arrangements have advantages in certain circumstances, we have found that an alternative stator construction could also be used.
The present invention provides an electric motor according to any one of claims 1 to 7 and 9 of Patent No. 1,434,192 wherein the coil is formed by two windings, each arranged to be alternately connected across a power supply.
In order that the present invention be more readily understood, an embodiment thereof will now be described by way of example with reference to the accompanying drawing which shows a circuit diagram of an electric motor.
The drawing is identical to Figure 5 of
Patent 1,434,192 up to the collectors of the drive transistors Tr8, Tr9 and so no description of the operation of the circuit will be given here. The modification which has been made is that the collector of the transistor Tr8 is connected to one end of a winding W1 the other end of which is connected to earth. Further, the collector of Tr8 is connected to resistor Roll.
The collector of Tr9 is connected to one end of a further winding W2 the other end of which is connected to the positive terminal of a power supply.
When the transistor Tr8 is conductive, current flows through the winding W1 and when the transistor Tr9 is conductive current flows through winding W2. The windings are wound and disposed on a former (not shown) in such a way that current flow through winding W1 is in the opposite direction to current flow through the winding W2 so that alternating magnetic poles are produced at the ends of the former.
If necessary, a resistance can be connected in series with one or both of the windings.
The above arrangement has the advantage that neither a centre-tapped power supply nor a centre-tapped stator coil is required.
In other respects, the motor construction is identical to the constructions disclosed in our Patent 1,434,192.
Claims (4)
1,434,192 wherein the coil is formed by two windings, each arranged to be alternately connected across a power supply.
2. An electric motor according to claim 1, wherein a resistance is connected in series with one of said windings.
3. An electric motor according to claim 1, wherein a resistance is connected in series with each of said windings.
4. An electric motor substantially as hereinbefore described with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4989677A GB1558686A (en) | 1977-11-30 | 1977-11-30 | Electric motors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4989677A GB1558686A (en) | 1977-11-30 | 1977-11-30 | Electric motors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1558686A true GB1558686A (en) | 1980-01-09 |
Family
ID=10453925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4989677A Expired GB1558686A (en) | 1977-11-30 | 1977-11-30 | Electric motors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1558686A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3010435A1 (en) * | 1980-03-19 | 1981-09-24 | Papst-Motoren Kg, 7742 St Georgen | COLLECTORLESS DC MOTOR |
-
1977
- 1977-11-30 GB GB4989677A patent/GB1558686A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3010435A1 (en) * | 1980-03-19 | 1981-09-24 | Papst-Motoren Kg, 7742 St Georgen | COLLECTORLESS DC MOTOR |
| FR2478896A1 (en) * | 1980-03-19 | 1981-09-25 | Papst Motoren Gmbh & Co Kg | DC MOTOR WITHOUT COLLECTOR |
| US4374347A (en) | 1980-03-19 | 1983-02-15 | Papst Motoren Kg | Brushless d-c motor system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |