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Hitachi

Hitachi Industrial Equipment Systems Co.,Ltd.

Motor : ECOHEART

Permanent Magnet Synchronus Motor (Brush-less DC Motor : DCBL)

Hitachi provides Total Solution for Motor Drive System

Motor : ECOHEART

Background

  • Diversity of customer demands toward specific motor drive systems.
  • Strong ecological demands on environmental problems and energy saving.
  • Customer demands for realizing both high efficiency and downsizing.
  • Flexible system design to improve usefulness of motor drive systems.
  • Systematic organization of open control network.

Drive System Trend

  • Hitachi has been developing low cost systems equivalent to that of IM.
  • More applications are expected, because of high efficiency, down sizing and low-noise.

Drive System Trend

Features

1. Actual Efficiency Example

  • Rated Output 3.7kW
  • Rated RPM 7200 min-1
  • Rated Torque 0.5kgm
  • Carrier Frequency 8kHz
RPM
[rpm]
Output
[kw]
Vdc
[V]
Inver
[%]
Motor Eff.
[%]
Total
[%]
7500 3.8 280 95.3 92.2 87.9
7200 3.7 278 95.6 91.4 87.4
6600 3.4 279 95.0 91.9 87.3
6000 3.1 281 94.6 91.7 86.8
4000 2.1 284 92.9 90.5 84.1
2000 1.0 282 88.3 87.6 77.4

Actual Efficiency Example

2. Control method using sinusoidal wave form

Objectives

  • Noise reduction by lowering torque ripple
  • Efficiency Improvement by suppressing harmonics
Current wave form Trapezidal wave form
(120 degree)
Sinusoidal wave form
(180 degree)
Current harmonics large small
Torque ripple large small
Method of detecting induced voltage Detecting circuit Presumption by caculation
Method of detecting magnetic pole position During current zero period
During current zero period
Presumption from current
and voltage wave
Presumption from current and voltage wave
Subject Quick response, Robustness

3. DCBL size and performance

DCBL size and performance

Type Volume Efficiency Noise Bearing life time
IM 100% 83% 68dB (A) 20,000 hr
DCBL 50% 92% 55dB (A) 40,000 hr

3.7kW/3600min-1

Hitachi can support

Design, Supply and Support for Motor + Controller from One Supplier

- Performance, Specification matching for Motor + Controller
- One source of the support/reply

Size, Dimension to match Compressor/Pump

- Total combination of Compressor/Pump + Motor + Controller for Size, Balance and even for Cost Performance

Application Example

- Various Pumps, Vacuum Pump
- Compressor
- Submersible Pump
- Air Compressor
- Air-Conditioner etc.

Product Inquiry