Control apparatus for electric railcar
US7176645B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2005 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Apr 21, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L2200/26
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control apparatus for an electric railcar that provides control so that when rotational speed of a motor decreases below a required value, torque of the motor will decrease at a required rate of change, a current limiter for limiting a torque current command “(A)Iqp” output from a current command arithmetic unit is provided to ensure that when the rotational speed of the motor decreases below the required value, the torque current command will be limited to a command value “(B)Iqp” smaller than that command value, and to ensure that a carrier frequency at which PWM signals are created when switching elements of the electric power converter are controlled by carrier generator is controlled to become lower than a carrier frequency existing when the rotational speed of the motor decreases below the required value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.