Title:
直巻きモータ及びその制御方法
Document Type and Number:
Japanese Patent JP2007533287
Kind Code:
A
Abstract:
A circuit for a series motor for a power tool is disclosed, wherein reliable switching is achieved by means of two electronic switches, without the use of a mechanically disconnecting switch. To this end, two electronic switches, preferably triacs, are preferably connected in series to each other, the voltage drop across the triacs being continuously monitored by a monitoring circuit. A check for faults can be carried out before switching on the power tool. Alternatively, a fusible cutout can be tripped by means of a protective switch connected in parallel thereto.
Inventors:
Christophe cress
Martin beichert
Martin beichert
Application Number:
JP2007507688A
Publication Date:
November 15, 2007
Filing Date:
March 26, 2005
Export Citation:
Assignee:
Zwent Efein Gamebha
International Classes:
H02H3/05; H02H7/08; H02P7/06; H02P7/285; H02P25/14; H02H3/02; H02H3/04
Domestic Patent References:
| JPS4880208U | 1973-10-02 | |||
| JPH1014278A | 1998-01-16 | |||
| JPH0646522A | 1994-02-18 | |||
| JPH07245938A | 1995-09-19 |
Foreign References:
| DE3924653A1 | 1991-01-31 | |||
| DE3119794A1 | 1982-12-23 |
Attorney, Agent or Firm:
Toru Tanabe