US3798519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural motor control system
Assignee: Power Electronics International Inc
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Filing: 1973-02-07
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Granted: 1974-03-19
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Expires: 1993-02-07
Abstract
Abstract A motor control system including a three phase AC motor means for driving a load at high speed and a single phase AC motor means for driving the load at a lower speed. The electrical energy transferred to the three phase motor means may be progressively increased until the three phase motor means operates at said high speed; and the electrical energy transferred to the single phase motor means may be progressively increased until the single phase motor means operates at said lower speed. In an elevator application of the subject motor control system, the elevator movement from one vertical level to a second level is started with the three phase motor means, and the elevator speed is progressively increased until reaching a maximum speed as the 3 phase motor reaches the high ''''full'''' speed. Prior to levelling the elevator at the second level, the control system is switched from the three phase motor to the single phase motor, to provide a counter torque for decelerating the speed of the elevator until the elevator is slowed to a minimum speed as the single phase motor means reaches the low ''''full'''' speed.
Inventors
- 👤 V Habisohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:51
CPC Classifications
B; B66; B66B; B66B1/00; B66B1/02; B66B1/06
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
78 words
A motor control system for moving a load comprising: a three phase alternating current (AC) motor means for increasing the speed of movement of said load; a single phase AC motor means for decreasing said speed of movement; a power switching network having an input and an output for transferring electrical energy from said input to said output; and means for associating said three phase and said single phase motor means with said output of the switching network.
Claim 2
Dependent Claim
78 words
A motor control system for moving a load comprising: a three phase alternating current (AC) motor means for increasing the speed of movement of said load; a single phase AC motor means for decreasing said speed of movement; a power switching network having an input and an output for transferring electrical energy from said input to said output; and means for associating said three phase and said single phase motor means with said output of the switching network.
Claim 3
Dependent Claim
29 words
The system of claim 1, wherein said last-mentioned means includes: motor switch means for connecting and disconnecting said three phase and singlE phase motor means from said switching network.
Claim 4
Dependent Claim
48 words
The system of claim 1, wherein said power switching network includes: a three phase power switching means for transferring three phase electrical power to said three phase motor means; and a single phase power switching means for transferring single phase electrical power to the single phase motor means.
Claim 5
Dependent Claim
22 words
The system of claim 1, includes: voltage switch means for connecting and disconnecting electrical voltage from the input of said switching network.
Claim 6
Dependent Claim
64 words
The system of claim 1 includes: means to associate said three phase motor means with said power switching network for increasing the speed of said load; and means for dis-associating said three phase motor means from said power switching network and associating said single phase motor means for providing a counter torque to act on said load to decrease the speed of the load.
Claim 7
Dependent Claim
51 words
The system of claim 1 includes: an operational control means to progressively increase the period of current conduction through said power switching network from an intital time period to a greater time period per cycle, when transferring said energy to said three phase motor means or said single phase motor means.
Claim 8
Dependent Claim
31 words
The system of claim 2 includes: means for preventing current conduction through said power switching means when connecting either of said motor means to the output of said power switching network.
Claim 9
Dependent Claim
29 words
The system of claim 7 includes: delay means to prevent current conduction for a predetermined time period after switching either of said motor means to said power switching network.
Claim 10
Dependent Claim
64 words
The system of claim 2, wherein said motor switch means: a three phase motor switch means for connecting and disconnecting three phase electrical energy from the output of the switching network to the three phase motor means; and a single phase switch means for connecting and disconnecting single phase electrical energy from the output of the switching network to the single phase motor means.
Claim 11
Dependent Claim
38 words
The system of claim 4, wherein said voltage switch means includes: means to generate a disable signal to prevent current conduction through said power switching network when connecting and disconnecting voltage from the input of said switching network.
Claim 12
Dependent Claim
23 words
The system of claim 10 includes: delay means to prevent current conduction for a predetermined time period after said disable signal is generated.
Claim 13
Dependent Claim
93 words
The system of claim 6, wherein said operational means includes: a three phase operational control means to progressively increase the period of current conduction through said switching network from an initial time period to a greater time period per AC cycle, when transferring said energy to said three phase motor means; and a single phase operational control means to progressively increase the period of current conduction through said switching network from an initial time period to a greater time period per AC cycle, when transferring said energy to said single phase motor means.
Claim 14
Dependent Claim
65 words
The system of claim 4 wherein said voltage switch means includes: a three phase forward voltage switch means for connecting three phase AC voltage to the input of said power switching network in a forward phase direction; and a single phase forward voltage switch means for connecting single phase AC voltage complementary with said forward phase direction, to the input of said power switching network.
Claim 15
Dependent Claim
74 words
The system of claim 13, wherein said voltage switch means further includes: a three phase reverse voltage switch means for connecting 3 phase AC voltage to the input of said power switching network in a reverse phase direction with respect to said forward phase direction; and a single phase reverse voltage switch means for connecting reverse single phase AC voltage complementary with said reverse phase direction, to the input of said power switching network.
Claim 16
Dependent Claim
28 words
The system of claim 1, wherEin the ''''full'''' speed of the 3 phase motor means is substantially greater than the ''''full'''' speed of the single phase motor means.
Claim 17
Dependent Claim
29 words
The system of claim 1, wherein the direction of rotation of said single phase motor means is determined by the direction of rotation of said 3 phase motor means.
Claim 18
Dependent Claim
17 words
The system of claim 1, wherein said single phase motor means does not include a starting coil.
Claim 19
Dependent Claim
68 words
The system of claim 1, wherein said means for associating the three phase motor means with the output of the switching network includes: a forward connecting means for connecting electrical energy in a forward direction to the three phase motor means; and a reverse connecting means for connecting electrical energy in a reverse phase direction as compared to said forward phase direction, to said three phase motor means.
Claim 20
Dependent Claim
23 words
The system of claim 18 includes: means to prevent current conduction through said switching network when connecting said forward or reverse connecting means.
Claim 21
Dependent Claim
23 words
The system of claim 19 includes: means to prevent current conduction through said switching network when dis-connecting said forward or reverse connecting means.
Claim 22
Dependent Claim
21 words
The system of claim 1, wherein said three phase motor means and said single phase motor means have a common rotor.
Claim 23
Dependent Claim
41 words
The system of claim 1, includes: means for accelerating the movement of said load when the three phase motor is associated with the system; and means for decelerating the movement of said load when the single motor is associated with system.
Claim 24
Dependent Claim
44 words
The system of claim 22 wherein said means for decelerating the movement of said load includes: means for switching from the three phase motor to the single phase motor when said load is moving due to the rotational force of the three phase motor.
Claim 25
Dependent Claim
23 words
The system of claim 18 includes: means to prevent current conduction through said switching network when disconnecting said forward or reverse connecting means.
Claim 26
Independent Claim
101 words
A method for moving a load between two points with a three phase alternating current (AC) motor providing a high speed and a single phase AC motor providing a low speed, including the steps of: transferring electrical power to the three phase motor; increasing the speed of the three phase motor toward said high speed to increase the speed of the load; disconnecting the transfer of electrical power to the three phase motor; transferring electrical power to the single phase motor; and decreasing the speed of the load by increasing the torque of the single phase motor from an initial torque.
Claim 27
Independent Claim
101 words
A method for moving a load between two points with a three phase alternating current (AC) motor providing a high speed and a single phase AC motor providing a low speed, including the steps of: transferring electrical power to the three phase motor; increasing the speed of the three phase motor toward said high speed to increase the speed of the load; disconnecting the transfer of electrical power to the three phase motor; transferring electrical power to the single phase motor; and decreasing the speed of the load by increasing the torque of the single phase motor from an initial torque.
Claim 28
Dependent Claim
19 words
The method of claim 25, wherein the speed of the three phase motor is accelerated toward its high speed.
Claim 29
Dependent Claim
23 words
The method of claim 25, wherein the speed of the load is decelerated as the torque of the single phase motor is increased.
Claim 30
Dependent Claim
48 words
The method of claim 25 wherein the period of electrical power transfer to the three phase motor per AC voltage and current cycle is progressively increased from an initial period per cycle to a greater period per cycle, for progressively increasing the speed of the three phase motor.
Claim 31
Dependent Claim
49 words
The method of claim 25, wherein the period of electrical power transfer to the single phase motor per AC voltage and current cycle is progressively increased from an initial period per cycle to a greater period per cycle, for progressively increasing the torque of the single phase motor means.
Claim 32
Dependent Claim
93 words
The method of claim 25, wherein the period for AC voltage and current transfer to the three phase motor is progressively increased at a first rate of increase from an initial period per cycle to a greater period per cycle, and the period for AC voltage and current transfer to the three phase motor is progressively increased at a second rate of increase from said greater period to a maximum period per cycle until said three phase motor is near or at ''''full'''' speed, said second rate being greater than said first rate.
Claim 33
Dependent Claim
81 words
The mEthod of claim 25, wherein the period per AC voltage and current transfer to the single phase motor per cycle is progressively increased at a first rate of increase from an initial period per cycle to a greater period per cycle, and the period per AC voltage and current cycle is progressively increased at a second rate of increase from said greater period to a maximum period per cycle until said single phase motor is near as a ''''full'''' speed.
Claim 34
Dependent Claim
201 words
The method of claim 29, wherein said transferring of electrical power to the three phase motor means and the single phase motor means includes: connecting an AC source to an input to a power switching network; connecting the three phase motor to the output of the power switching network; progressively increasing the period of transfer of electrical power through the switching network to the three phase motor, after the AC source and the three phase motor are connected respectively at said input and said output, from an initial period per AC voltage and current cycle to a greater period per cycle and thereby progressively increasing the speed of the three phase motor from an initial speed to a greater speed; disconnecting the three phase motor from the output of the switching network; connecting the single phase motor to the output of the switching network; and progressively increasing the period of transfer of electrical power through the switching network to the single phase motor means from an initial period per AC voltage and current cycle to a greater period per cycle and thereby progressively increasing the counter torque provided by the single phase motor from an initial torque to a greater torque.
Claim 35
Independent Claim
136 words
A method for driving a load between a start point and a stop point with an alternating current (AC) motor means having a full speed comprising the steps of: progressively increasing the period of electrical energy per AC cycle transferred in a first phase direction to the motor means from an initial period to a greater period per cycle, to cause the torque of the motor means to progressively increase and said speed to progressively increase toward said full speed; and progressively increasing the period of electrical energy per AC cycle in an opposite phase direction with respect to said first phase direction, transferred to the motor means from an initial period to a greater period per cycle, to progressively increase the counter torque and thereby cause said motor means to slowly reach said stop point.
Claim 36
Independent Claim
136 words
A method for driving a load between a start point and a stop point with an alternating current (AC) motor means having a full speed comprising the steps of: progressively increasing the period of electrical energy per AC cycle transferred in a first phase direction to the motor means from an initial period to a greater period per cycle, to cause the torque of the motor means to progressively increase and said speed to progressively increase toward said full speed; and progressively increasing the period of electrical energy per AC cycle in an opposite phase direction with respect to said first phase direction, transferred to the motor means from an initial period to a greater period per cycle, to progressively increase the counter torque and thereby cause said motor means to slowly reach said stop point.
Claim 37
Dependent Claim
32 words
The method of claim 33, wherein said energy is transferred in said opposite direction after said load has passed said stop point, to cause said load to return to said stop point.
Claim 38
Dependent Claim
23 words
The method of claim 33 includes: preventing energy transfer to said motor means prior to causing said energy transfer in said opposite direction.
Claim 39
Dependent Claim
86 words
The metnod of claim 33, wherein said energy is increased in said first direction to a motor means having a high full speed and the energy is increased in said reverse direction to said high speed motor means, and said method further comprises: progressively increasing the period of electrical energy per AC cycle in said first direction to a motor means having a low full speed, prior to progressively increasing the energy per cycle in said opposite direction to said motor having said high full speed
Claim 40
Dependent Claim
17 words
The method of claim 36, wherein said full speed motor means is a single phase motor means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |