Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
  • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
  • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
  • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
  • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
  • H02M7/505—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
  • H02M7/515—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
  • H02M7/5152—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with separate extinguishing means
• • 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
  • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
  • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
  • H02P25/032—Reciprocating, oscillating or vibrating motors
  • H02P25/034—Voice coil motors

Definitions

• the invention relates to a collectorless DC motor for four-quadrant operation according to the preamble of claim 1.
• These motors are servomotors that can be precisely controlled in both directions of rotation, both in motor and in generator operation.
• the commutation device is formed by semiconductor current gates arranged in a bridge circuit and formed by thyristors, which are to be erased by semiconductor main current gates arranged in the supply line between the DC source and bridge circuit and formed by thyristors with an extinguishing device (DT-AS 12 08 803).
• the object of the invention is to provide a collectorless DC motor for four-quadrant operation according to the preamble of claim 1, which ensures both safe operation with faulty ignition of the semiconductor current gates in the bridge circuit and largely inertia-free speed control at low cost.
• the thyristors in the bridge circuit are quenched automatically for the commutation of the stator winding, so to speak, automatically by the switch-off phase of the transistors for current regulation.
• the current regulation by the transistors inevitably involves the quenching of the thyristors for commutation, so that no additional control elements are required.
• the arrangement of transistors in both supply lines from the direct current source to the bridge circuit formed by thyristors ensures that the latter is fully ready for blocking in order to erase safety in the event of faulty ignition of two thyristors in series in the bridge circuit. Since such faulty ignitions occur relatively frequently, for example due to external disturbances, the unrestricted readiness to lock comes Transistors with regard to a safety quenching of the thyristors very important.
• the control device briefly blocks the two transistors due to the short-circuit current that occurs, so that the faulty-ignited thyristor in the bridge circuit is extinguished again and the drive, in contrast to the prior art, continues to operate without interruption. There is therefore no standstill of the drive, and no external intervention in the drive is required.
• the figure shows the circuit design of a fast-reacting collectorless DC motor for four-quadrant operation.
• M denotes the 3-phase synchronous motor with permanent magnetic armature and the stator windings W 1 , W 2 , W 3 .
• the electronic commutation device is designated by K. It has a 3-phase bridge circuit Br with the thyristors Th + R ' Th_ R , Th + S , Th_ s , Th + T , Th_ ⁇ .
• the bridge branch 1 is connected via the connection point 4 to the connection point 12 of the stator windings W 1 , W 2 , the bridge branch 2 via the connection point 5 to the connection point 13 of the stator windings W 2 , W 3 and the bridge branch 3 via the junction point 6 with the junction point 14 of the stator windings W 3 , W 1 .
• connection points 12, 13, 14 of the stator windings are connected via the connection points 16, 17, 18 to the diode pairs D 1 , D 2 , D 3 , D 4 and D 5 , D 6 bypassing the transistors T 1 , T 2 thus via these diode pairs with the current paths 8, 11 of the direct current source formed by the rectifier G or with the associated buffer capacitor 23. In this way, when the three-phase synchronous motor is operated as a generator, energy is fed back into the direct current source.
• a tachogenerator TG is coupled to the motor shaft 20 and supplies the motor speed as an electrical signal in the form of a voltage.
• This signal is supplied to the control unit St as the actual value signal (V ist ) and is compared there with the input desired value signal (V soll ) for the speed.
• the resulting differential signal forms the control signal for the transistors T 1 , T 2 that open and close at a constant frequency.
• the current flow and thus the speed are controlled by influencing the blocking and opening times of the transistors.
• a digital position transmitter 21 is coupled to the motor shaft 20, which supplies the respective position of the motor shaft as a signal for the thyristors to be ignited in the bridge circuit Br as a function of the position of the motor shaft.
• a surge limiter is called.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Branch Pipes, Bends, And The Like (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6699871

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (2)

Citations (3)

• 1979
  • 1979-12-07 JP JP50026279A patent/JPS56501705A/ja active Pending
  • 1979-12-07 WO PCT/DE1979/000142 patent/WO1981001777A1/de unknown
  • 1979-12-07 GB GB8116256A patent/GB2075775B/en not_active Expired

Patent Citations (3)

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