Method and apparatus for automatic determination of elevator drive configuration

An apparatus comprising:

• a processor of a drive computer configured to control the drive computer to,
• obtain a plurality of electrical motor parameters via a communication channel from a memory associated with an electrical motor,
• transmit a first signal causing the electrical motor to rotate a traction sheave of an elevator a rotational amount, after obtaining of the plurality of the electrical motor parameters, the traction sheave configured to hoist an elevator car via a plurality of traction ropes in response to the electrical motor rotating the traction sheave,
• receive a first measurement signal from at least one of an accelerometer of an elevator car and a position sensor of the elevator car, the first measurement signal indicating a distance travelled by the elevator car in response to the traction sheave rotating the rotational amount,
• determine a roping ratio of the elevator based on the distance travelled by the elevator car and the rotational amount,
• read a plurality of elevator car weights of the elevator car from a load weighing device during a plurality of tests after the processor determines the roping ratio, the elevator car being loaded during the plurality of tests with respective ones of a plurality of test weights, each of the plurality of test weights being different,
• determine a plurality of torque values for respective ones of the plurality of test weights based on respective ones of a plurality of second measurement signals received from at least one of an accelerometer of the elevator car and a position sensor of the elevator car, the plurality of torque values being applied by the electrical motor to lift the elevator car with a set starting acceleration, and
• record to a memory of the drive computer, the plurality of torque values such that the plurality of torque values are associated in the memory of the drive computer with the respective ones of the plurality of elevator car weights.

A non-transitory computer readable medium containing computer readable instructions that, when executed by a processor of a drive computer, cause the processor to control the drive computer to:

• obtain a plurality of electrical motor parameters via a communication channel from a memory associated with an electrical motor;
• transmit a first signal causing the electrical motor to rotate a traction sheave of an elevator a rotational amount after the processor obtains the plurality of the electrical motor parameters;
• receive from at least one of an accelerometer of an elevator car and a position sensor of the elevator car a first measurement signal indicating a distance travelled by the elevator car in response to the traction sheave rotating the rotational amount
• determine a roping ratio of the elevator based on the distance travelled by the elevator car and the rotational amount;
• read a plurality of elevator car weights of the elevator car from a load weighing device during a plurality of tests after the processor determines the roping ratio, the elevator car being loaded during the plurality of tests with respective ones of a plurality of test weights, each of the plurality of test weights being different;
• determine a plurality of torque values for respective ones of the plurality of test weights based on respective ones of a plurality of second measurement signals received from at least one of the accelerometer of the elevator car and the position sensor of the elevator car, the plurality of torque values being applied by the electrical motor to lift the elevator car with a set starting acceleration;
• and
• record to a memory associated with of the drive computer, the plurality of torque values such that the plurality of torque values are associated in the memory with the respective ones of the plurality of elevator car weights.