A Novel Nine-Switch Inverter
for Independent Control of Two Three-phase Loads
ABSTRACT
Industrial applications require large numbers of motors.
For example, motors are used to manipulate industrial robots, an electric vehicles
with in-wheel motors and electric trains. Two methods exist for controlling PM
motors providing an inverter to control each motor, and connecting the motors
in parallel and driving them with a single inverter. The first method makes an
experimental apparatus complex and expensive; the second does not allow
independent control of each motor because of differences in rotor angle between
the two motors. Thus, we propose a novel nine-switch inverter that can independently control two three-phase
loads. This paper introduces the structure of the nine-switch
inverter, which is made from nine
switches. The
validity of the proposed inverter is verified
through simulations and experiments.
BLOCK DIAGRAM:
Fig.
1. Block diagram of establishment of modulation rate.
CIRCUIT DIAGRAM:
Fig. 2.Main circuit of proposed nine-switch inverter
CONCLUSION:
This
paper proposes a nine-switch inverter and a PWM method that can
independently control two three-phase loads. The simulations and the
experiments were performed to verify the validity of the proposed inverter. The
results confirmed that the nine-switch inverter can independently
control amplitude and frequency for two three-phase loads, and permanent magnet
synchronous motors; however, there is some ripple amplitude, and slight
interference between Inv1 and Inv2. Work is needed to improve of
the interference problem.
REFERENCES:
[1]
Yusuke Nozawa, Motoki Hizume, Yuta Kimura, Kazuo Oka, and Kouki Matsuse,
“Independent Position Control of Two Permanent Magnet Synchronous Motors with
Five–Leg Inverter By the Expanded Two–Arm Modulation Method”, IEEJ Industry
Applications Society Conference, 2005, (in Japanese)
[2]
Tsutomu Kominami and Yasutaka Fujimoto, “Magnetic Levitation Control and
Spiral-Linear Transformation System for Spiral Motor”, IEEE Int.
Workshop on Advanced Motion Control, vol. 2, pp. 529-534, 2006
[3]
Tsutomu Kominami and Yasutaka Fujimoto, “Proposal of a Nine-Switch Inverter
That Can Independently Control Two PM Motors”, IEEJ Industry Applications
Society Conference, pp. 187-190, 2006, (in Japanese)
[4]
Kazuo Oka and Kouki Matsuse, “A Nine-Switch Inverter for Driving Two AC Motors
Independently”, IEEJ Trans. on Electrical and Electronic Engineering,
2007
[5]
Tsutomu Kominami and Yasutaka Fujimoto, “Development of a Nine- Switch Inverter
That Can Independently Control Two Loads”, IEEJ Annual Meeting Record,
pp. 133-134, 2007, (in Japanese)
