EP0173216A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Control system for a power converter for driving induction motors
Assignee: Toshiba Corp
•
Filing: 1985-08-19
•
Granted: —
•
Expires: 2005-08-19
Abstract
Abstract In a control system (CS) for a power converter (PC) for driving induction motors (4), the control system separately controlling an exciting current component of the primary current of the induction motors contributing to generation of a magnetic flux and a torque current component of the primary current contributing to generation of a torque, a voltage detecting device (19) detects the output voltage (V) of the power converter, and a correcting device (21) responds to the voltage detecting device for determining a current correction (Ai) for correcting at least one of the exciting current component and the torque current component to reduce the difference of the detected voltage (V) from a reference value (V o ) of the output voltage.
Inventors
- 👤 Masanori Miyazaki
- 👤 Yoshihiro Ogashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 00:09
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/46; H02P2207/00; H02P2207/01; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
124 words
A control system (CS) for a power converter (PC) for driving induction motors (4), the control system separately controlling an exciting current component of the primary current of the induction motors contributing to generation of a magnetic flux and a torque current component of the primary current contributing to generation of a torque, characterized in that said control system comprises: voltage detecting means (19) detecting the output voltage (V) of the power converter, and correcting means (21) responsive to the voltage detecting means for determining a current correction (Ai) for correcting at least one of the exciting current component and the torque current component to reduce the difference of the detected voltage (V) from a reference value (V 0 ) of the output voltage.
Claim 2
Dependent Claim
124 words
A control system (CS) for a power converter (PC) for driving induction motors (4), the control system separately controlling an exciting current component of the primary current of the induction motors contributing to generation of a magnetic flux and a torque current component of the primary current contributing to generation of a torque, characterized in that said control system comprises: voltage detecting means (19) detecting the output voltage (V) of the power converter, and correcting means (21) responsive to the voltage detecting means for determining a current correction (Ai) for correcting at least one of the exciting current component and the torque current component to reduce the difference of the detected voltage (V) from a reference value (V 0 ) of the output voltage.
Claim 3
Dependent Claim
162 words
A control system of claim 1, further comprising: means (5) for detecting the speed (w r ) of one (4a) of the induction motors, speed control means (6) responsive to a speed * reference (w r ) and the detected speed (w r ) for producing a torque current reference (i * 1q ), magnetic flux control means (8) responsive to * a magnetic flux reference (Φ) and the actual magnetic flux (Φ) for determining an exciting current reference (i * 1d ), means (9, 13, 14, 16; 28) responsive to the * torque current reference (i lq ), and the exciting current * * reference (i ld ), for determining the magnitude (I 1 ) and the phase (8 1 ) of the primary current of the induction motors, and means (11, 12; 29, 30, 31) for controlling the power converter (PC) in accordance with the magnitude * (I 1 ) and the phase (θ 1 ) of the primary current.
Claim 4
Dependent Claim
31 words
A control system of claim 2, further comprising means (22) for adding the current correction (Ai) * to the exciting current reference (i ld ) for correcting the exciting current reference.
Claim 5
Dependent Claim
29 words
A control system of claim 2, further comprising magnetic flux reference determining means (24) responsive to the current correction (Ai) for determin- * ing the magnetic flux reference (Φ).
Claim 6
Dependent Claim
25 words
A control system of claim 2, further comprising means (33) responsive to the current correction (Ai) for correcting the torque current reference (i l q).
Claim 7
Dependent Claim
85 words
A control system of claim 2, wherein the power converter (PC) comprises a current type inverter system comprising a rectifier (1) and an inverter (3), and said means for controlling the power converter comprises * means (11, 12) responsive to the magnitude (I1) of the primary current for controlling the magnitude of the current of the rectifier (1), and said inverter (3) is so controlled that its output current has the phase as determined by said means for determining the phase of the primary current.
Claim 8
Dependent Claim
47 words
A control system of claim 2, wherein the power converter (PC) comprises a PWM-controlled inverter (27), said control system (CS) further comprising means * responsive to the magnitude (I l ) and the phase (8 1 ) of the primary current for controlling the PWM-controlled inverter (27).
Claim 9
Dependent Claim
43 words
A control system of claim 2, wherein the power converter (PC) comprises a cyclo-converter, said control system (CS) further comprising means * responsive to the magnitude (I 1 ) and the phase (θ l ) of the primary current for controlling the cyclo-converter.
References Cited (Backward Citations)
DE2818933A1
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.