Method of providing information on an annular position of a DC electromotor, the method comprising: monitoring electrical supply parameters including a supply current and a supply voltage for the DC electromotor and obtaining at least one value of at least one monitored parameters by means of sampling at a sampling frequency f; determining an expected pulse moment at which a pulse in the supply current is expected to occur; and counting the pulse if the pulse is detected at the expected pulse moment; obtaining a resistance value of a winding of the electromotor; determining the expected pulse moment based on values of the electrical supply parameters, the winding resistance and the sample frequency; and the method further comprising, at each sample point: - multiplying the resistance value of the winding and the supply current value at each sample point; - summing a difference between the supply voltage and a product of the resistance value of the winding and the supply current value for subsequent samples to a supply product sum; - determining an electromagnetic force parameter K e based on the relation: V bat − R ⋅ I = K e ⋅ f wherein V bat is the supply voltage, R the resistance of the winding, I the supply current and f an annular frequency of the electromotor; and - determining the expected pulse moment as a moment at which the supply product sum is substantially equal to a product of the electromagnetic force parameter and the sampling frequency. monitoring electrical supply parameters including a supply current and a supply voltage for the DC electromotor and obtaining at least one value of at least one monitored parameters by means of sampling at a sampling frequency f; determining an expected pulse moment at which a pulse in the supply current is expected to occur; and counting the pulse if the pulse is detected at the expected pulse moment; obtaining a resistance value of a winding of the electromotor; determining the expected pulse moment based on values of the electrical supply parameters, the winding resistance and the sample frequency; and the method further comprising, at each sample point: - multiplying the resistance value of the winding and the supply current value at each sample point; - summing a difference between the supply voltage and a product of the resistance value of the winding and the supply current value for subsequent samples to a supply product sum; - determining an electromagnetic force parameter K e based on the relation: V bat − R ⋅ I = K e ⋅ f wherein V bat is the supply voltage, R the resistance of the winding, I the supply current and f an annular frequency of the electromotor; and - determining the expected pulse moment as a moment at which the supply product sum is substantially equal to a product of the electromagnetic force parameter and the sampling frequency. - multiplying the resistance value of the winding and the supply current value at each sample point; - summing a difference between the supply voltage and a product of the resistance value of the winding and the supply current value for subsequent samples to a supply product sum; - determining an electromagnetic force parameter K e based on the relation: V bat − R ⋅ I = K e ⋅ f wherein V bat is the supply voltage, R the resistance of the winding, I the supply current and f an annular frequency of the electromotor; and - determining the expected pulse moment as a moment at which the supply product sum is substantially equal to a product of the electromagnetic force parameter and the sampling frequency. <EOS>