发明名称 |
METHOD FOR CHECKING BRAKE TORQUE |
摘要 |
In an AC inverter drive connected to an AC induction motor on a material handling machine, the motor (which has a load holding brake and a pulse-emitting shaft encoder) moves a load in hoisting or lowering directions. A method for checking brake load-holding torque including the steps of decelerating the motor toward zero speed, setting the brake, applying "float" load-holding electrical power to the motor, changing the current flowing to the motor and checking for motor rotation by pulse-counting. Motor power is blocked if the number of counted pulses is less than a predetermined number or is increased if the number of counted pulses is greater than a predetermined number, the latter indicating that the brake is incapable of holding the load.
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申请公布号 |
CA2098894(C) |
申请公布日期 |
1995.12.12 |
申请号 |
CA19932098894 |
申请日期 |
1993.06.21 |
申请人 |
HARNISCHFEGER CORPORATION |
发明人 |
WENDT, DAVID C.;LAPOTA, ROBERT J.;FLIERL, KARL T. |
分类号 |
G01L5/28;H02P3/04;H02P3/18;H02P29/04;(IPC1-7):G01L5/28 |
主分类号 |
G01L5/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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