Claims
- 1. In a control circuit for controlling with a current type inverter a frequency to be given to an induction motor; said current type inverter comprises:
- a two-phase sine wave generator which receives a rotation speed signal .theta. of said induction motor (2107) and a torque instruction signal i.sub.2 obtained from a speed deviation signal, and in which said rotation speed signal .theta. is added to a slip frequency correspondent obtained through calculation from said torque instruction signal i.sub.2 to provide a revolving magnetic field angular speed .psi., from which signals im.alpha. and im.beta. corresponding to two-phase sine waves cos .psi. and sin .psi.; and
- a vector calculating circuit which receives outputs of said two-phase sine wave generator and said torque instruction signal i.sub.2 and calculates primary current components i.sub.1.alpha. and i.sub.1.beta. from an exciting current vector component and a secondary current vector component,
- the outputs of said vector calculating circuit being utilized as frequency instruction.
Priority Claims (5)
Number |
Date |
Country |
Kind |
52-98991 |
Aug 1977 |
JPX |
|
52-98992 |
Aug 1977 |
JPX |
|
52-153626 |
Nov 1977 |
JPX |
|
52-155998 |
Nov 1977 |
JPX |
|
53-24730 |
Mar 1978 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 933,914, filed Aug. 15, 1978, now U.S. Pat. No. 4,259,628.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3700986 |
Cushman et al. |
Oct 1972 |
|
4028600 |
Blaschke et al. |
Jun 1977 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
933914 |
Aug 1978 |
|