GB1375278A - - Google Patents
Info
- Publication number
- GB1375278A GB1375278A GB5586472A GB5586472A GB1375278A GB 1375278 A GB1375278 A GB 1375278A GB 5586472 A GB5586472 A GB 5586472A GB 5586472 A GB5586472 A GB 5586472A GB 1375278 A GB1375278 A GB 1375278A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- current
- speed
- rectifier
- capacitor
- 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
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
- H02K7/145—Hand-held machine tool
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
- H02K23/66—Structural association with auxiliary electric devices influencing the characteristic of, or controlling, the machine, e.g. with impedances or switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/292—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC
- H02P7/293—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using static converters, e.g. AC to DC using phase control
Abstract
1375278 Automatic current control METABOWERKE KG CLOSS RAUCH & SCHNIZLER 4 Dec 1972 [21 Jan 1972] 55864/72 Heading G3R [Also in Division H2] The spindle of an electric tool is driven by a series-wound motor through gearing which is selected to limit the no-load rotation speed of the spindle to a safe value if an electronic speed regulator should fail. As shown, a series motor 2 in an angle grinder has field windings 16, 21 armature 20 and may be supplied from A.C. mains over a main switch 13 and anti-parallel rectifiers 19,43. Rectifier 43 is phasecontrolled by a uni-junction transistor 41 biased by an RC circuit comprising a capacitor 42, resistor 49 and transistors 29, 40. In use, switch 13 is closed and the motor is initially supplied over resistors 17, 18 and rectifier 19. A capacitor 28 charges so that transistor 29 turns on, allowing the UJT 41 to trigger the SCR 43 on alternate halfcycles. After a pre-set delay, a switch 34 closes, placing a primary winding 35 of a current transformer in series with rectifier 19, and shorting resistors 17, 18 so that capacitor 28 discharges. The triggering of SCR 43 is now controlled by the current developed in secondary winding 36 which biases transistor 40 to vary the breakdown time of UJT 41. Increasing load on the grinder increases the motor current, causing increased power to be applied to the windings, so that the motor speed and current are stabilized. A speed step-down ratio of 3À5 between the motor shaft and tool spindle is said to limit the no-load speed to a safe value if the control circuit should fail.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722202872 DE2202872C3 (en) | 1972-01-21 | Power tools, in particular grinding tools |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1375278A true GB1375278A (en) | 1974-11-27 |
Family
ID=5833654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5586472A Expired GB1375278A (en) | 1972-01-21 | 1972-12-04 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2168810A5 (en) |
| GB (1) | GB1375278A (en) |
-
1972
- 1972-12-04 GB GB5586472A patent/GB1375278A/en not_active Expired
-
1973
- 1973-01-18 FR FR7301700A patent/FR2168810A5/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE2202872B2 (en) | 1976-12-30 |
| DE2202872A1 (en) | 1973-07-26 |
| FR2168810A5 (en) | 1973-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19921203 |